EPA Draft Guidance Targets PFAS in Biosolids, Raising Safety Concerns for Home Garden Soil Amendments

On July 1, 2026, the Environmental Protection Agency released Docket ID No. EPA-HQ-OW-2026-2509, a regulatory document that fundamentally shifts how the federal government views the fertilizer sold at local garden centers. The new draft guidance addresses the presence of per- and polyfluoroalkyl substances (PFAS)—widely known as "forever chemicals"—in biosolids. For homeowners preparing their raised beds or top-dressing their lawns, the policy pivot moves the burden of navigating soil safety away from federal mandates and directly onto the consumer.[1][2]

To understand the stakes, it is necessary to trace how these chemicals reach the backyard. When domestic sewage from households and businesses flows into municipal wastewater treatment plants, the liquids are separated from the solids. The resulting nutrient-rich byproduct, known as sewage sludge, is treated to meet federal standards and rebranded as "biosolids." While the majority of this material is applied to large-scale agricultural land, a portion is bagged and sold in hardware stores and garden centers across the country as a consumer soil amendment.[1]

The complication arises from the durability of PFAS. Because these chemicals are used in everything from non-stick cookware and waterproof clothing to cosmetics and cleaning products, they are routinely washed down the drain. Wastewater treatment plants are not designed to filter out these microscopic synthetic compounds. As a result, the chemicals survive the treatment process and concentrate in the solid sludge, creating a direct pathway from industrial and household waste to residential garden soil.[3]

The federal approach to managing this pathway has undergone a dramatic reversal over the past eighteen months. In January 2025, the EPA released a draft risk assessment indicating that biosolids containing just one part per billion of certain PFAS compounds could pose health risks over decades of application. That assessment modeled scenarios where farming families consumed food and water exclusively from land treated with biosolids, concluding that the practice could lead to elevated cancer risks and other health impacts.[3]

The 2025 assessment sent shockwaves through the wastewater and agricultural sectors. Municipal utilities warned that if they were forced to stop land-applying biosolids, they would have to incinerate the sludge or send it to landfills—both of which are significantly more expensive and carry their own environmental liabilities. Engineering firms and industry advocates argued that the EPA's models were overly conservative and did not reflect typical exposure levels for the general public.[2]

The July 2026 draft guidance effectively abandons that earlier risk assessment. The current EPA leadership determined that the 2025 models relied on assumptions that were too disconnected from real-world conditions to provide actionable regulatory limits. Instead of proposing strict numeric caps on PFAS concentrations in fertilizer, the new document offers voluntary recommendations for wastewater treatment plants, farmers, and landowners.[1][2][3]

Under the new framework, the EPA supports the continued beneficial reuse of biosolids as a critical component of wastewater management. The guidance suggests commonsense risk reduction strategies, such as avoiding the application of biosolids near waterways or on lands where children play, and steering clear of crops that carry a higher risk of human exposure. However, because these are recommendations rather than enforceable rules, compliance is left to the discretion of local utilities and state agencies.[1][3]

Environmental advocates have strongly condemned the policy shift. Organizations like the Southern Environmental Law Center argue that the EPA is ignoring its own scientific findings regarding the bioaccumulation of PFAS in crops and livestock. Critics point out that even trace amounts of these chemicals can build up in the human body over time, and that replacing a comprehensive risk assessment with voluntary guidance leaves rural communities and home gardeners vulnerable to contamination.[4]

For the wastewater industry, the guidance provides a necessary reprieve from what many viewed as an unworkable regulatory cliff. Industry representatives note that wastewater treatment plants are receivers, not producers, of PFAS. They argue that the most effective way to reduce contamination in garden soil is not to ban biosolids, but to implement stricter industrial pretreatment requirements that stop the chemicals from entering the sewer system in the first place.[2][3]

In the absence of federal limits, the landscape of soil safety is fracturing along state lines. Several states have already begun imposing their own monitoring obligations, source control expectations, and land application restrictions that go beyond federal requirements. This patchwork approach means that a bag of compost or soil amendment sold in one state may be subject to rigorous PFAS testing, while the exact same product sold across the border is entirely unregulated.[3]

For the home gardener, this regulatory uncertainty requires a new level of vigilance at the garden center. Identifying biosolids in commercial products is not always straightforward, as packaging rarely features the term prominently. Consumers must read the fine print on the back of the bag, looking for terms like "biosolids," "treated sewage sludge," or specific brand names associated with municipal wastewater programs.[1]

Gardeners who wish to avoid PFAS entirely must navigate a complex set of alternatives. Municipal compost made exclusively from yard waste and food scraps is generally considered lower risk, though it can still contain trace chemicals from treated wood or contaminated packaging. Animal manure from trusted local farms is another traditional option, provided the livestock were not grazed on fields previously treated with industrial biosolids.

Synthetic fertilizers offer a chemical alternative that bypasses the wastewater stream entirely, but they lack the organic matter necessary to build long-term soil health and can contribute to nutrient runoff in local waterways. Each option presents a distinct set of trade-offs between cost, environmental impact, and chemical exposure, forcing homeowners to weigh their priorities before amending their soil.

The EPA is accepting public comments on the draft guidance through September 2026, a process that will ultimately shape the final federal strategy for managing forever chemicals in the nation's soil. Until a consensus is reached, the responsibility for keeping PFAS out of the backyard vegetable patch remains squarely in the hands of the person holding the trowel.[3]