The Biosolids PFAS Problem
Municipal sewage sludge — processed into biosolids — has been applied to agricultural land as a nutrient-rich fertilizer for decades. However, PFAS from industrial discharges, household products, and fire suppression activities contaminate municipal wastewater, and conventional treatment does not remove PFAS from biosolids. Farmers who received PFAS-contaminated biosolids unknowingly accumulated these compounds in their soil, crops, and livestock.
When farm PFAS contamination was discovered in Maine, Michigan, and other states, the consequences were devastating: quarantined livestock, condemned milk and produce, loss of farm value, and serious health concerns for farm families who had been consuming contaminated produce and water for years. These high-profile cases galvanized state regulatory action.
State Regulatory Responses
Maine enacted the first comprehensive ban on PFAS-contaminated biosolids application, along with groundbreaking legislation requiring PFAS testing of agricultural products and providing compensation to affected farmers. Michigan suspended biosolids land application from facilities receiving significant industrial PFAS discharges while PFAS monitoring data was collected.
Several other states — including Vermont, New Hampshire, and Massachusetts — have implemented biosolids PFAS monitoring requirements and are developing application restrictions. The patchwork of state approaches is driving pressure for national federal standards to ensure consistency.
Federal Rulemaking Status
EPA is developing federal biosolids PFAS standards under the Clean Water Act, which regulates biosolids as part of the sewage sludge program. The rulemaking will establish PFAS concentration limits above which biosolids cannot be applied to land, along with monitoring and reporting requirements.
Industry groups — including water utilities and biosolids processors — are engaged in the rulemaking process, arguing that strict limits will eliminate land application for most biosolids and create disposal crises. Environmental and public health advocates argue that the land application program should not continue to spread PFAS contamination. EPA’s final rule will need to balance these competing interests within its statutory authority.