Sewage Sludge and Biosolids Land Application — PFAS, Pharmaceutical Residues, and Heavy Metals in Agricultural Soil (Class B Biosolids, Emerging Contaminants, Farmland Contamination) — outdoor safety profile
High riskApproximately 50% of the 7.2 million dry tonnes of sewage sludge generated annually by US wastewater treatment plants is applied to agricultural land as 'biosolids' — a euphemism adopted by the wastewater industry in 1991 to rebrand this material as a fertilizer resource.
What is this product?
Approximately 50% of the 7.2 million dry tonnes of sewage sludge generated annually by US wastewater treatment plants is applied to agricultural land as 'biosolids' — a euphemism adopted by the wastewater industry in 1991 to rebrand this material as a fertilizer resource. EPA Part 503 regulations (1993) established concentration limits for 10 heavy metals in biosolids but did not address the thousands of organic micropollutants that have since been identified in sewage sludge, including PFAS (per- and polyfluoroalkyl substances), pharmaceuticals (antibiotics, hormones, antidepressants, NSAIDS), microplastics, and antimicrobial resistance genes. PFAS contamination of agricultural soils from biosolids application has emerged as the defining environmental issue: farms in Maine, Michigan, New Mexico, and multiple other states have been condemned after soil PFAS levels from decades of biosolids application rendered crops and livestock products unmarketable. Maine became the first state to ban land application of biosolids (LD 1911, effective 2022) after discovering PFAS contamination on farms that had received biosolids for decades. The Stonyfield/Storey Farm case in Maine documented blood PFAS levels in the farming family 20-100x above national averages. Class B biosolids — the category applied to most agricultural land — retain detectable pathogen levels and require access restrictions, but these restrictions expire after 30 days for grazed land and 14 months for food crops. No federal standard exists for PFAS in biosolids, though EPA is developing risk assessments for PFOA and PFOS in this context.
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Persistent Contaminant
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