Quick Key Facts
- Bioremediation is a process that uses plants and microorganisms like bacteria, fungi and algae to treat contaminated soils, water and other pollution.
- Microorganisms are very small organisms that live naturally in the environment and bioremediation stimulates the growth of certain microbes that use contaminants as a source of food and energy.
- Bioremediation methods can be used to clean up oil and other petroleum products, chemical pollution, pesticides, wastewater and sewage, excessive nutrients in waterways, and can be used to break down plastic pollution.
- Bioremediation may take place “in situ” at the contamination site, or “ex situ” away from the site.
- For bioremediation to be effective, the right temperature, nutrients and food must be present. Proper conditions allow the right microbes to grow and multiply — and eat more contaminants.
- Bioremediation can also be used on pollution caused by natural disasters like hurricanes, tsunamis and wildfires.
What Is Bioremediation?
Over the last century, urbanization and industrialization, combined with poor waste management, has led to an alarming rise in the amount of pollution in our soils, waterways, groundwater and air.
Heavy metal toxins from industrial production, chemicals from the agriculture sector, untreated wastewater, plastic pollution, crude oil leaks and spills, toxins from the increasing wildfires, and other pollutants need systems-level change. However, natural processes in the environment do offer solutions.
Bioremediation is a process by which plants and microbes that are already present in the environment — like fungi, algae and bacteria — have the power to remove or reduce environmental pollution — even plastic pollution.
While natural bioremediation has been around since the dawn of time (microbes were the earliest known life forms), modern bioremediation offers techniques that stimulate and augment these processes.
Types of Bioremediation
There are several forms of bioremediation. Here are some of the more prominent examples.
Microbial Remediation
Microbial remediation uses microorganisms to degrade organic contaminants or to bind heavy metals to make them less available to other organisms. Microorganisms can use them for food, or metabolize them along with food.
This can be done by breeding bacteria in high numbers and then introducing them into contaminated areas, through a process called bioaugmentation, or it can be done through a process called biostimulation, which creates the conditions for an ideal habitat for bacterial growth in the contaminated soil or water.
The byproduct of microbial remediation floats in the lagoon at the French Limited Superfund site in Houston, Texas on July 1, 1993. An industrial waste facility where oils, grease, acids and solvents were dumped, the site was treated with naturally occurring bacteria that digest toxic sludge. Paul S. Howell / Liaison
Phytoremediation
Phytoremediation uses plants to clean up contaminated soil, water and air. There are several subprocesses by which plants can do this.
With phytoextraction, contaminants are removed from the soil and concentrated in the plant tissue above ground. Some plants used to extract heavy metal contaminants are sunflowers, willow and Indian mustard.
Phytostabilization uses plants to sequester toxic heavy metals below ground to prevent migration into the ecosystem, helping to reduce the chance of metals entering the food chain. Poplar trees are one of the plants used for this process.
Phytoremediation with hydroponic plants at the abandoned Cunha Baixa uranium mine in Viseu, Portugal on May 30, 2014. Daniela / Flickr
In phytovolatilization, plants can also absorb contaminants, convert them into less toxic substances, then through transpiration, which is the exhalation through pores of the plant, let them evaporate in the atmosphere. Also, in the process of rhizofiltration, plants filter water through a root system that removes toxic substances and excess nutrients.
Mycoremediation
This process uses fungi’s digestive enzymes to break down contaminants in the environment. Fungi can break down chemical pollutants, including oil and pesticides, can extract or bind heavy metals, and can filter water. Fungi can also break down certain plastics.
Bioremediation Processes
While there are numerous bioremediation types, there are also several processes that have been utilized and are either done in situ (at the place of contamination) or ex situ (off-site of the contamination).
Some in-situ processes can involve bioventing, which is a process of aerating soils in order to promote bioremediation by stimulating the biological activity of indigenous microbial populations. Or it can involve the opposite, which is biosparging, injecting pressurized air or gas into contaminated zones in order to target chemical compounds that degrade under aerobic conditions.
There are also pump-and-treat methods that remove and treat contaminated groundwater.
Ex-situ processes can include landfarming, which is a waste treatment process that transports contaminated soil and spreads it on the ground at another site, stimulating microbial activity within the soils through aeration and/or the addition of minerals, nutrients and moisture.
As mentioned above through bioventing and biosparging, processes also involve whether or not an organism requires oxygen to break down an environmental contaminant, which is aerobic bioremediation, or if an organism carrying out bioremediation can breathe some other molecule besides oxygen, which is anaerobic bioremediation.
Bioremediation of Hazardous Waste Sites
In 1980, the United States Environmental Protection Agency (EPA) established the Superfund program to clean up sites contaminated with hazardous substances. Thousands of contaminated sites exist nationally and the waste is primarily due to hazardous waste being dumped or improperly managed by manufacturing facilities, processing plants, landfills, mining sites and pollution from the military.
Since 1999, the EPA has utilized bioremediation in cleanups involving petroleum and chemicals found in crude oil, pesticides and other contaminants. One of the most common methods used is bioventing, also known as biostimulation — aerating soils to stimulate the biological activity of indigenous microbes.
One of the sites they cleaned up is an example of anaerobic bioremediation and was used to remediate the groundwater at Dover Air Force Base in Delaware.
The area was contaminated by industrial activity and hazardous waste storage. Remediation began in 2006, and since then over 240,000 gallons of a solution of vegetable oil and sodium lactate were injected into the location to provide carbon sources to fuel the growth of microorganisms.
As of 2022, 1329 Superfund sites across the country were on the national priorities list, with 452 cleaned up since the program’s establishment. Though $1 billion dollars was recently allocated toward cleaning up 22 toxic sites, the program has languished for years due to a lack of funding.
Hemp phytoremediation on the former Loring Air Force Base – a Superfund site. Upland Grassroots
Grassroots organizations have also stepped up to use bioremediation. Upland Grassroots in Limestone, Maine is working to remediate Loring Air Force Base, which has been identified by the EPA as one of several sites with PFAS (also known as forever chemicals) in the soil, which can cause cancer and other adverse health effects.
The site has since been taken over by the M’ikmaq Nation, the Indigenous Tribe of Aroostook County. Tribal members teamed up with scientists to start a phytoremediation project that involved planting fiber hemp to pull the PFAS out of the ground, which they’ve done successfully since 2019.
Bioremediation Uses on Agriculture Land
According to the Center for Biological Diversity, the United States uses more than 1 billion pounds of pesticides every year, and as little as 0.1% of an applied pesticide interacts with its targeted weed or pest. The remainder contaminates the soil, air and water and can have significant impacts throughout the ecosystem and on public health.
Pesticides can also linger in the soil for years or decades after they are applied.
Over the last century, industrial agriculture has led to more application of pesticides. The pesticides are a major threat to ecosystem biodiversity, compromising soil health alongside other unsustainable agriculture methods.
Cleanup of soil contaminated by the use of pesticides on a former orchard, at Lincoln Elementary School in Wenatchee, Washington in 2006. Washington State Department of Ecology
Application of animal waste from industrial animal facilities can also be a cause of heavy metal contamination from metals in feed, including copper, zinc and lead. Animal waste from factory farms that is spread on agricultural fields may also contain harmful microbes and antibiotics, with other pharmaceutical residues that can affect soil.
Conventional approaches to remediation, which involve chemicals and physical extraction, are costly, and introduce other pollutants. However, phytoremediation approaches are more sustainable when reclaiming soils.
The Rhizae Renewal Collective phytoremediates a lead-contaminated lot in Baltimore’s Johnston Square, using sunflowers and fungi to make it suitable for food production, pictured on Sept. 18, 2020. Baltimore Heritage / Flickr
Currently, the Upland Grassroots folks are also planting fiber hemp on farmland owned by the Tribal Nation contaminated with pesticides and fungicides.
Other microbial remediation methods include biostimulation, through using indigenous microbes, nutrients and other substances to encourage microbes to feed on chemical pollutants. Bioaugmentation can also be used by introducing bacterial microbes sourced from outside the soil to aid in remediation.
Another method studied has been the use of microalgae. With its ability to grow rapidly in moist locations, microalgae can absorb and degrade toxic contaminants and heavy metals. Some of the non-degraded particles can be absorbed by microalgae, and then be turned into biomass for use in biodiesel production.
Construction equipment levels gravel and soil during a remediation project on the site of the old Pacific Rod and Gun Club at Lake Merced in San Francisco, California on Dec. 1, 2015. Paul Chinn / The San Francisco Chronicle via Getty Images
Bioremediation of Marine and Freshwater Environments
Our marine, coastal and freshwater resources are constantly impacted by human-caused pollution. Bioremediation methods are used with plastics, industrial and agricultural waste, chemicals from pesticides contaminating waterways and groundwater, raw sewage, fuel and other pollutants.
Workers from the Lake Restoration company pump gallons of alum into Lake Rebecca near Rockford, Minnesota on Nov. 10, 2010. The compound improves water quality by precipitating out phosphates in the lake water. David Brewster / Star Tribune via Getty Images
Oil Spills
Bioremediation methods were used during the devastating 1989 Exxon Valdez Oil spill of 11 million gallons over 1300 miles of Alaska coastline, killing hundreds of harbor seals and bald eagles.
Around 110,000 pounds of nitrogen in fertilizer was applied to numerous areas for three years. Through biostimulation, the nutrients added to the soils enabled local microbes to degrade contaminants more efficiently.
Another approach to bioremediation of oil spills is bioaugmentation, which uses oil-degrading bacteria to supplement the existing microbial population.
Treatment requires certain conditions to be effective. For example, the nutrients need to remain intact with the oiled material, and the concentration of nutrients, like in the fertilizer, needs to support the maximum growth rate of the microbes, both of which don’t work in open water environments, because anything applied to a floating oil slick would disperse.
However, hundreds of kinds of bacteria, fungi and archaea (microbes different from bacteria) are capable of degrading petroleum.
Phytoremediation is also utilized in oil cleanups. In one instance, researchers reported that a floating treatment wetland, which used four different plant species to vegetate a floating mat made of locally sourced materials, successfully remediated a majority of contamination at a water stabilization pit in Pakistan. The plants and the water in the pit were inoculated with different hydrocarbon-degrading bacteria.
Eutrophication
Eutrophication is when a body of water becomes overloaded on nutrients, as a result of human activity like sewage discharge, surface runoff from industrial agricultural practices with manure and fertilizers, and home lawn practices. This leads to acidification, harmful algal blooms which produce toxins that make humans and animals sick, and the depletion of oxygen, resulting in dead zones and fish kills.
According to the National Oceanic and Atmospheric Administration (NOAA), 65% percent of the estuaries and coastal waters in the contiguous U.S. studied by researchers are moderately to severely degraded by excessive nutrient inputs.
A floating island of plants to filter stormwater runoff and remove excess nutrients from the water is installed at Angelica Creek Park in Reading, Pennsylvania on Sept. 22, 2016. Lauren A. Little / MediaNews Group / Reading Eagle via Getty Images
Phytoremediation has been used as a solution, with species that soak up the nitrates and phosphates, abating overnutrition and eutrophication. Commonly used plants for this task are macrophytes, which are aquatic plants that float on the water, such as water hyacinth or water lettuce.
After the species soaks up the excess nutrients, the plants used to target the issue are harvested and disposed of, and depending on the kinds of pollutants in the area, might be composted and reused as fertilizer.
Bioremediation and Natural Disasters
While wildfires are typically human-caused, they are still considered natural disasters, and they often leave behind many toxins through dangerous ash, remains of incinerated hazardous household waste and building materials, charred paint, pesticides, cleaning products, and other items that leave pollutants in the soil like arsenic, asbestos, copper, lead and zinc.
California, which has suffered severe wildfire devastation in recent years, has utilized bioremediation.
The California Department of Resources Recycling and Recovery, known as CalRecycle — a department within the California Environmental Protection Agency — promotes the benefits of mycoremediation after wildfires.
Wildfires eliminate the soil’s protective vegetative layer, exposing it to wind and rain. This can lead to sediments being washed during heavy rainfall into waterways, roads and neighborhoods, and potentially dangerous mudslides.
Utilizing compost restores soil properties, provides a protective layer, binds and absorbs contaminants, increases water infiltration, protects against erosion and helps reestablish vegetation.
After the wildfires in 2017, as federal and state workers used traditional methods to remove a lot of the toxic debris, a coalition of fire remediation experts, local businesses and ecological activists in Sonoma County worked together to try mycoremediation with oyster mushrooms.
Called the Fire Remediation Coalition, they installed 40 miles of wattle — straw-filled tubes designed to prevent erosion — inoculated with oyster mushrooms around parking lots, along roads and across hillsides. These divert runoff from sensitive waterways, while the mushrooms break down the toxins.
Following the 2018 Camp Fire, a mushroom farmer who lost his property founded the nonprofit Butte Remediation to provide his neighbors with no-cost mycoremediation. The founder, Cheetah Tchudi, is now working alongside ecological restoration nonprofit CoRenewal, which after the 2020 fires has been experimenting with mycoremediation in some of the burn zones.
Mushrooms sprout from wattle following California’s Camp Fire in 2018. Butte Remediation
As Lahaina on Maui moves forward with recovery from a devastating fire last August, some residents are encouraging the local government to utilize bioremediation to clean up toxic pollutants in the water and soil.
The Maui Bioremediation Group is looking to remediate the environment using genki balls — biodegradable capsules filled with clay and beneficial microorganisms to clean the waterways — and like the Fire Remediation Coalition in California, use fungi-inoculated wattles.
Bioremediation for Plastic
Bioremediation can be one of the solutions to our plastic crisis. Research has shown a few ways this can occur. One is through mealworms, which can eat and fully degrade plastic in hours due to microscopic bacteria in their guts that result in them secreting an enzyme that allows for the breakdown.
Another study from a team of researchers in Queensland has pointed to superworms as a source to devour plastic. The team has been seeking to identify which superworm gut enzyme is most effective at degrading plastic, and they hope to reproduce it at scale for recycling.
Several different microorganisms like fungi, bacteria and algae have different enzymes that lead to degradation.
To date, 436 species of fungi and bacteria have been found to degrade plastic, while researchers continue to make new discoveries.
Scientists recently found two strains of fungi in soils that can break down polypropylene (plastic that is often used to make bottle caps and food containers) in just 140 days.
In 2016, scientists in Japan discovered a bacteria in sludge outside a bottling factory in Japan had developed the ability to devour or decompose PET plastics, leading some to believe breakthroughs like this might lead to industrial-scale facilities that can tackle plastic waste that otherwise might end up in a landfill.
Bacteria and fungi have also been found in the Alps and the Arctic that only work at cold temperatures. Nineteen strains, including 11 fungi and 8 bacteria, were able to digest polyester-polyurethane, while 14 fungi and 3 bacteria were able to digest polybutylene adipate terephthalate (used in food packaging, agricultural, textile and other industries) and polylactic acid (used in clothing, disposable cutlery and medical implants).
During the process of mineralization, algae has been found to transform plastic waste into metabolites such as water and carbon dioxide as well as new biomass. Microalgae, specifically, has also been a promising candidate to destroy microplastics, and is said to be easily cultivated on a large scale, because it doesn’t require fertile land, freshwater or pesticides to grow.
Research is ongoing in the bioremediation of marine plastic pollution, utilizing bacteria, fungi and microalgae to accelerate the biodegradation process that turns certain plastics into a source of carbon, hydrogen or methane.
Policy
In 2021, the EPA put out a document for Principles for Greener Cleanups, which outlines policy for evaluating and minimizing the environmental footprint when cleaning up contaminated sites. The document includes EPA’s recommended best management practices fact sheets for project managers and stakeholders.
Before and after photos of a green remediation project at the Elizabeth Mine in South Strafford, Vermont. U.S. Department of Environmental Protection
It includes processes such as biostimulation, bioaugmentation and bioreactors, which all in some ways promote the growth of microbes, or create the right conditions to help the process of allowing them to thrive to be able to aid in the breakdown of contaminates.
It also promotes the beneficial use of locally generated industrial byproducts like wood chips, sawdust or agricultural byproducts, as well as manure, wastewater and pesticide-free compost from mushroom farms instead of using new products.
Bioremediation Projects
Formerly known as Amazon MycoRenewal Project, this nonprofit organization provides education and research in ecosystem restoration, health and healing, and sustainable community dynamics utilizing mycoremediation.
After the fires in Lahaina, a coalition of biologists, cultural practitioners, ecologists, conservationists and specialists teamed up to work towards using several bioremediation methods for cleanup of the wildfire disaster.
Established in 2018 in response to the Camp Fire in Northern California, this organization provides soil testing bioremediation with mycoremediation, and provides consulting and educational outreach.
This Illinois-based company uses fungi to reduce toxins in some landfill materials like gypsum, carpet, rubber and asphalt, as well as to absorb and digest waste, then converts it into reusable materials that can be used in compost or building materials.
This grassroots organization in Maine does phytoremediation research on fiber hemp’s ability to remove toxins. They are currently working on a Superfund site at the former Loring Air Force Base on land contaminated with jet fuel, as well as former farmland owned by the Mi’kmaq Nation that is contaminated with pesticides and fungicides.
Phytoremediation using hemp at the former Loring Air Force Base in Limestone, Maine. Chelli Stanley / Upland Grassroots
Hawai’i-based nonprofit using genki balls (mud balls made with clay, soil, rice, bran, molasses and other components) to restore the ecosystem at the polluted Ala Wai Canal on O’ahu, so it can once again be swimmable and fishable.
(@townie.tay)
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The first Earth Day was celebrated on April 22, 1970 — 56 years ago — and, goodness, how the world has changed since then. We’ve come a long way since the days of burning our trash and pumping our gas guzzlers with leaded gasoline. In honor of those 56 years, here are 56 important changes and milestones since the first Earth Day.
Legislation
The U.S. government has led much of the environmental charge, starting with the implementation of the EPA (1) in July 1970. Later that year, the Clean Air Act (2) targeted air pollutants, followed by the Clean Water Act (3) in 1972 and the Endangered Species Act (4) in 1973.
Some lesser-known national laws included the Safe Water Drinking Act (5) in 1974, the Resource Conservation and Recovery Act (6) in 1976, the Toxic Substances Control Act (7) in 1976, the National Energy Act (8) in 1978, and the Medical Waste Tracking Act (9) in 1988.
In some cases, states have led the charge. Oregon passed the first bottle bill (10) in 1971, Minnesota’s Clean Indoor Air Act (11) was the first law to restrict smoking in public places (1975), and Massachusetts required low-flush toilets (12) for construction and remodeling in 1988.
Green Innovations: The Early Years
In order to comply with all the laws from the 1970s, we needed new technology to ensure consumers could adhere to the new standards. Consider:
- The “Crying Indian” PSA debuts in 1971 (13)
- Dichlorodiphenyltrichloroethane (DDT) gets banned in 1972 (14)
- The energy-efficient compact fluorescent light bulb launches in 1973 (15)
- Cars begin displaying fuel economy labels in the mid-1970s (16)
- In 1975, all cars are manufactured with catalytic converters to limit exhaust emissions (17)
- Chlorofluorocarbons are banned from aerosol cans starting in 1978 (18)
- The first curbside recycling program begins in New Jersey in 1980 (19)
- In 1986, McDonald’s switches from foam to paper food containers (20)
- Mercury is removed from latex paint in 1990, providing a viable alternative to banned lead paint (21)
- Earth911 launches the first U.S. recycling directory in 1991 (22)
- Energy Star certification debuts in 1992 for appliances and electronics (23)
- The U.S. Green Building Council begins in 1993 (24)
The Political Movement
The Green Party (25) launched in 1984, which was just the beginning of green issues entering the mainstream. One Percent for the Planet (26) was founded in 2002 to challenge businesses to donate to environmental causes, and the ISO 14001 standard (27) established environmental management. Companies are now facing pressure to allow employee telecommuting (28).
Things really developed after the release of Al Gore’s An Inconvenient Truth (29) in 2006. NBC debuted Green Week (30) in 2007. Carbon offsets (31) alleviated corporate green guilt. Bisphenol A (32) made us all question plastic purchases. Hybrid vehicles (33) generated tax credits and gas savings. Plastic bag bans gave rise to a reusable bag (34) craze. Fracking (35) and the Dakota Access Pipeline (36) were two of the most hotly contested news stories of the decade, at least until the 2016 election.
Green Tech: The Next Wave
In the past 10 years, emerging green tech has made eco-friendly a way of life, including:
- LED light bulbs (37)
- Portable solar panels on backpacks and watches (38)
- Plant-based plastics (39)
- Motion sensor lighting (40)
- Faucets with automatic shut-off (41)
- Low volatile organic compound (VOC) paint (42)
- Recycled plastic clothing (43)
- Ride-sharing mobile applications (44)
- Natural cleaning products (45)
- Biodiesel engine vehicles (46)
- Food waste composting (47)
- Portable air purifiers (48)
- Europe’s Green Deal introduced global recyclables shipping regulations to reduce pollution in low-income nations (49)
- Corporate borrowers headed toward $500 billion in bond financings for the renewables transition (50)
- President Biden rejoins the Paris Climate Accord on his first day in office. (51)
The Latest Five: 2022–2026
The pace of innovation has not slowed. Five more milestones have reshaped the environmental landscape since that 51st Earth Day:
- The Inflation Reduction Act (52), signed into law in August 2022, became the largest climate investment in U.S. history, directing roughly $370 billion toward clean energy tax credits, EV incentives, methane reduction, and domestic clean manufacturing. Analysts projected it will drive more than $4 trillion in cumulative capital investment over a decade and put the U.S. on track for a 40% emissions reduction by 2030. Sadly, many of its key provisions have been defunded or eliminated by the Trump Administration.
- The Kunming-Montreal Global Biodiversity Framework (53), adopted by 188 governments in December 2022, set the most ambitious biodiversity protection commitment in history. Its headline “30×30” target calls for conserving 30% of the planet’s land, freshwater, and ocean areas by 2030, a goal that would require doubling current protected land coverage and quadrupling marine protections.
- America’s first commercial direct air capture plant (54), opened by Heirloom Carbon Technologies in Tracy, California in November 2023, marked the arrival of atmospheric carbon removal at commercial scale on U.S. soil. The plant uses limestone to absorb CO₂ directly from the air, with the captured carbon injected into concrete for permanent storage. In May 2024, Climeworks activated the world’s largest direct air capture facility, the Mammoth plant in Iceland, with a design capacity to remove 36,000 tons of CO₂ per year.
- Solid-state batteries (55), a next-generation alternative to conventional lithium-ion technology, moved from laboratory promise toward commercial reality between 2022 and 2026. Unlike liquid-electrolyte batteries, solid-state versions are less flammable, achieve higher energy density, and degrade more slowly. In early 2025, Mercedes-Benz began road-testing a prototype EV powered by a lithium-metal solid-state cell that extended driving range 25% over comparable liquid-battery models. Multiple automakers and cell manufacturers now target commercial production between 2027 and 2030.
- Perovskite and tandem solar cells (56), a new photovoltaic technology that pairs conventional silicon with thin perovskite layers, pushed solar efficiency into territory once considered theoretical. By 2024, tandem cells in laboratory settings exceeded 34% efficiency — well above the roughly 22% ceiling of standard silicon panels only a few years ago. manufacturers in Asia and Europe began scaling pilot production lines. Because perovskite cells can be printed on flexible substrates, they open the door to solar surfaces on buildings, vehicles, and everyday objects that conventional panels cannot reach.
The past 56 years have been huge when it comes to saving the environment. Expect more to come, including a resurgent EV industry, nuclear fusion, regenerative agriculture, restorative forestry, and more, as costs and the cool factor improve.
Editor’s Note: Originally published on April 18, 2018, this article was most recently updated in April 2026.
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This week’s quotation is from Franklin D. Roosevelt, 32nd president of the United States: “A nation that destroys its soils destroys itself. Forests are the lungs of our land, purifying the air and giving fresh strength to our people.”
Earth911 inspiration posters: Post them and share your desire to help people think of the planet first, every day. Click the poster to get a larger image.
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One gallon of water. That’s roughly how much a well-run aquaponics system uses to grow a kilogram of leafy greens. Compare that to the 30 or more gallons required by conventional soil farming, according to a 2024 comparative greenhouse study, and the benefits are inescapable.
That efficiency is why aquaponics — raising fish and growing plants in a closed-loop system — has moved from backyard novelty to subject of serious agricultural research. A 2025 review in Sustainable Environment Research documents how integrating AI, IoT sensors, and automation into aquaponics can significantly enhance system efficiency, increase food production, reduce operational costs, and minimize waste. For home gardeners in 2026, the barrier to entry has never been lower. All-in-one kits start under $100, water quality testing has become more accurate and affordable, and the science behind getting both fish and plants to thrive is well-established.
Nitrification is at the heart of every aquaponics system. Fish produce ammonia-rich waste. Beneficial bacteria convert that ammonia first into nitrite, then into nitrate — a form plants can absorb directly. The plants filter the water. The cleaned water returns to the fish. Once the system cycles, the main inputs are fish food and occasional water top-offs.
This article contains affiliate links. If you purchase an item through one of these links, we receive a small commission that helps fund our Recycling Directory.
1. Invest in Reliable Equipment
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The core hardware list hasn’t changed much — but what’s available at each price point has improved considerably.
Aquarium or tank. A 100-gallon tank remains the recommended starting point for a serious home system. It gives you flexibility in fish species, plant density, and system stability. Acrylic tanks are lighter and optically clearer; glass tanks are heavier but scratch-resistant. Expect to pay $300–$600 for a quality 100-gallon tank. Search current options on Amazon.
If you’re new to aquaponics, the AquaSprouts Garden Kit is a well-reviewed all-in-one beginner system that fits a standard 10-gallon aquarium. It includes a grow bed, submersible pump, mechanical timer, and light bar mounting system, and costs $75–$90. The aquarium itself is sold separately.
Canister filter. For a 100-gallon aquaponics tank, target 500–600 gallons per hour (GPH) of water turnover, well above what the tank volume alone would suggest, because the fish load demands high filtration. The Fluval FX2 (~$269 on Amazon) is consistently top-rated for tanks up to 100 gallons, featuring 4-stage filtration, Smart Pump technology that auto-adjusts flow, and a built-in water change system. A solid budget alternative is the Penn-Plax Cascade 1000 (~$199 on Amazon), which handles up to 100 gallons, recirculating the water more than twice an hour.
Air pump. Dissolved oxygen is critical for fish health and for the beneficial bacteria driving nitrification. A quality air pump — or a canister filter with an integrated spray bar — will keep oxygen levels stable. A 2025 review in Reviews in Aquaculture found that micro-nano bubble (MNB) aeration increased butterhead lettuce yield by 35% compared to conventional diffusers, and raised nitrate concentration in the water. MNB systems are commercially available but not yet mainstream for home setups, so a conventional air pump remains the practical choice for most beginners.
Grow lights (optional, system-dependent). Indoor systems need supplemental lighting. Full-spectrum LED grow lights have dropped substantially in price and energy draw. Look for LED bars with daylight-spectrum output (5000–6500K) sized to your grow bed. Search LED grow lights on Amazon.
Water heater (optional). Tilapia require 70–85°F. If your space runs cooler, a submersible aquarium heater is essential. Search aquarium heaters on Amazon.
2. Choose Your Setup
Three system types work at home scale. The choice depends on available space, target crops, and tolerance for complexity.
Media bed are recommended for beginners. Plants grow in a bed of inert media, such as expanded clay pebbles, gravel, or lava rock, positioned above or beside the fish tank. A pump floods the bed periodically, then drains back. The media supports roots and houses beneficial bacteria. Research from Texas A&M confirmed media beds are the most forgiving system for beginners and support the widest range of crops, including fruiting vegetables like tomatoes and cucumbers. The Oklahoma Cooperative Extension Service provides detailed DIY build plans.
A 2025 study found that carbonized rice husks and cocopeat as grow media can yield five times more crop than traditional expanded clay aggregate (LECA), though they decompose over time and require more frequent replacement.
Nutrient film technique (NFT). A thin stream of water flows continuously through PVC tubes past plant roots dangling inside. Excellent for herbs, lettuce, and small greens in tight or vertical spaces; the tubes can be wall-mounted. Vertical aquaponics setups can increase productivity per unit area by up to 160% compared to horizontal systems, based on research with strawberries and basil. NFT kits are available on Amazon for both DIY and complete systems.
Raft (deep water culture). Plants float on foam rafts with roots submerged directly in nutrient-rich water drawn from the fish tank. They produce a higher yield than NFT for leafy greens, but requires more robust filtration because solids aren’t removed by a media bed. More common in semi-commercial operations than small home setups. Check options on Amazon.
A growing range of IoT sensors let you track pH, dissolved oxygen, ammonia, and temperature continuously from your phone. WiFi pH/EC meters designed for hydroponic and aquaponic systems are now in the $60–$120 range. For beginners, manual weekly testing is fine. For anyone running a system unattended or scaling up, continuous monitoring significantly reduces the risk of a water quality crash.
3. Add the Fish
An aquaponics system will support many species of fish. Several of the most popular options are:
- Tilapia: The most common aquaponics fish for good reason. Tilapia tolerate temperature swings, pH variation, and elevated ammonia better than most species. They grow quickly (typical harvest: 6–8 months), are inexpensive to stock, and provide a dual harvest of vegetables and protein. Best for warm indoor or greenhouse systems (70–85°F).
- Koi: Popular ornamental choice. Koi tolerate poor water quality and are hardy once established, but they’re susceptible to a range of pathogens and aren’t typically harvested for food. Well-suited to media bed systems where water quality is easier to maintain.
- Bluegill, perch, and catfish. Solid edible alternatives to tilapia in cooler climates where tilapia’s warmth requirements are a challenge. Texas A&M’s fish species selection guide covers temperature ranges, feed conversion ratios, and disease susceptibility for home-scale species in detail.
These are great options, but you can also consider carp, perch, largemouth bass, bluegills, guppies, and more. Purchase fish from a reputable aquaculture supplier or local fish hatchery when possible — disease-carrying fish is one of the fastest ways to crash a new system. Pet store fish are not certified disease-free.
4. Add the Plants
Like fish, the options are endless when deciding which vegetables to grow in your aquaponics system. Some popular options include broccoli, celery, cucumbers, and basil.
But because different plants require different conditions, you’ll want to select plants that will thrive in your setup. As Go Green Aquaponics explains, it is important to consider the following:
- System: What type of aquaponics system you will use – plants with no root structure do well in a raft setup, while root vegetables do well in a media bed.
- The optimal temperature and pH level for your fish and your plants – the closer the match, the more successful you’ll be.
- Environment: the amount of light, temperature and – if you’re setting up your system outside – rain the plants will get.
- How much space you have for plants versus how much space the plants need to grow.
- Plant-to-fish ratio: The more fish you plan on having, the more plants you need to absorb the nutrients.
5. Maintain Your System
Keeping healthy plants and fish will require regular maintenance. Some tips include:
-
Feed your fish two to three times daily in small amounts. Overfeeding is the most common cause of ammonia spikes in home systems. Uneaten food decomposes rapidly and overwhelms the beneficial bacteria that keep the system in balance.
Test pH weekly. Target range is 6.4–7.4, with most systems running best around 6.8–7.0. The API Freshwater Master Test Kit (~$35 on Amazon) tests pH, ammonia, nitrite, and nitrate in one kit — the standard recommendation for aquaponics monitoring. For more serious systems, the LaMotte Aquaponics Water Test Kit (~$85 on Amazon) covers nine parameters including dissolved oxygen and carbon dioxide, and comes with a rugged carrying case. To raise pH naturally, dissolve a tablespoon of food-grade potassium carbonate (potash) in a bucket of system water, add it slowly to the tank, and retest after 24 hours before adding more.
Test ammonia and nitrate weekly or biweekly. Ammonia should be below 2 ppm; nitrates should stay under 160 ppm. Elevated ammonia: feed less, increase aeration, or reduce fish density. High nitrates: add more plants or remove some fish.
Mind the cycling period. A new system takes 4–6 weeks to fully cycle and for the bacterial colony to establish and nitrogen conversion to stabilize. Don’t increase fish load or plant density during this period. Ammonia and nitrite readings near zero consistently is your green light.
The following video from Rob Bob’s Aquaponics provides guidance on how to check the pH, ammonia levels, and nitrate levels.
Get Some Fish In Your Garden
Aquaponics is an easy and environmentally conscious way to grow produce and raise fish at the same time. It can be used to grow all your favorite leafy greens, and there are endless varieties of fish that will adapt well to this system. Just keep up with regular maintenance and aquaponics will prove to be a viable and sustainable new way to garden.
The science of aquaponics is advancing quickly. Three developments from recent peer-reviewed literature are worth knowing about, even if most aren’t yet practical for home systems:
Algae co-cultivation. Reviews in Aquaculture reports that introducing macroalgae such as Spirogyra spp. can nearly double plant yields compared to traditional aquaponic systems. Co-cultivating microalgae (Chlorella) with plants in raft systems also controls ammonia at twice the efficacy of non-algal systems. This is emerging research — not yet mainstream for home growers — but a promising direction for anyone looking to push yields further.
Decoupled system design. Research from the Journal of the World Aquaculture Society (2024) documents that decoupled systems, which separate the aquaculture unit from the hydroponic unit, allow optimized conditions in each component, resulting in better nutrient utilization and increased productivity compared to coupled designs. Decoupled systems allow independent pH management for fish and plants, which is otherwise a constant compromise in standard coupled setups. Commercially available decoupled systems are beginning to become available; for DIY builders, it’s a worthwhile design consideration when scaling up.
AI and IoT integration. A 2025 Sustainable Environment Research review emphasizes that monitoring strategies using artificial intelligence, the Internet of Things, and renewable energy can significantly enhance aquaponic system efficiency. For home growers, this means the WiFi monitoring systems mentioned in Step 2 are part of a broader wave of automation coming to small-scale aquaponics. The good news: prices will continue to drop.
Editor’s Note: This article was originally published on March 17, 2021, and updated in April 2026. Feature image of outdoor aquaponics system courtesy of Vasch~nlwiki, CC BY-SA 4.0, via Wikimedia Commons
About the Author
David Thomas is founder and editor-in-chief of Everything Fishkeeping, a fishkeeping and aquascaping magazine. He has been keeping fish since he was a child and has kept over 12 different setups. His favorite is his freshwater tank with Tetras and Loaches.
The post How To Grow Vegetables With Aquaponics appeared first on Earth911.
https://earth911.com/home-garden/grow-vegetables-with-aquaponics/
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