{"hq_id":"hq-p-out-000074","name":"PFAS in Compost and Biosolids (Sewage Sludge, Crop Uptake, Compostable Packaging, Farmland Contamination, Maine Biosolids Ban)","category":{"primary":"outdoor","secondary":"pfas_compost_biosolids","tags":["PFAS","biosolids","sewage sludge","compost","crop uptake","farmland contamination","PFOA","PFOS","land application","Maine biosolids ban","compostable packaging","total fluorine","lettuce","strawberry","forever chemicals","soil accumulation"]},"product_tier":"OUT","overall_risk_level":"high","description":"PFAS contamination in compost and biosolids represents one of the most insidious pathways for 'forever chemicals' to enter the food supply and accumulate in agricultural soils. Sewage sludge (biosolids) from wastewater treatment concentrates PFAS from household and industrial discharges, with total PFAS concentrations ranging from 10 to 10,000 micrograms per kilogram. Approximately 60% of the estimated 4.75 million dry tons of biosolids produced annually in the US are land-applied to agricultural fields, with an estimated 4.6 million acres receiving biosolids applications. A 2021 study in Environmental Science & Technology found PFAS accumulation in soils receiving repeated biosolids applications over 10-20 years, with total PFAS reaching 100-1,000 ug/kg in topsoil — levels that trigger plant uptake. Crop uptake studies show that leafy greens (lettuce, spinach) and fruit crops (strawberries) accumulate the highest PFAS concentrations, with short-chain PFAS (PFBA, PFHxA) showing greater plant mobility than long-chain compounds (PFOA, PFOS). The Stonyfield Farm litigation in Maine revealed that a 6th-generation dairy farm was contaminated by decades of biosolids application, with well water PFOS exceeding 300 ng/L and cattle blood serum showing elevated PFAS — ultimately forcing the farm to cease operations. Maine's landmark LD 1911 (2022) became the first statewide ban on land application of PFAS-containing biosolids. Michigan's Oscoda Township contamination from biosolids linked to former Wurtsmith AFB AFFF further demonstrated the scale of the problem. Adding to the crisis, 'compostable' food service packaging has been identified as a PFAS source in compost: a 2023 Mamavation/Environmental Health News investigation found total fluorine levels of 10-300+ ppm in 64% of tested compostable food service items (bowls, plates, clamshells), meaning PFAS-contaminated packaging is being composted and applied to organic farmland. The Biodegradable Products Institute (BPI) updated its certification to require PFAS testing in 2023, setting a 100 ppm total fluorine limit for certified compostable products.","synthesis":{"derived_risk_level":"moderate","synthesis_confidence":0.82,"synthesis_method":"compound_composition","context_used":"occupational_exposure","context_source":"product_users_fallback","exposure_modifier":1.15,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":2,"compounds_total":2,"synthesis_date":"2026-03-27","synthesis_version":"1.0.0"},"hazard_summary":{"sensitive_populations":"consumers eating produce from biosolids-amended farmland (especially leafy greens, strawberries), farmers and sludge haulers handling biosolids, infants and children (higher PFAS intake per body weight), communities using well water near biosolids-amended fields, organic farmers using contaminated compost","overall_risk":"high","primary_concerns":["PFAS in biosolids (10-10,000 ug/kg) land-applied to 4.6 million acres of US farmland","Crop uptake of PFAS — lettuce and strawberries show highest concentrations","64% of compostable food service items contain PFAS (10-300+ ppm total fluorine)","No federal PFAS limits in biosolids or compost as of 2025"],"exposure_routes":"Ingestion (PFAS in produce grown on biosolids-amended soil, PFAS in drinking water from contaminated groundwater, PFAS migration from compostable food packaging). Dermal (worker contact with biosolids during land application and handling)"},"exposure":{"routes":["ingestion","dermal"],"contact_types":["ingestion_indirect","dermal_contact"],"users":["consumer","worker","general_population"],"duration":"chronic","frequency":"daily","scenarios":["Consumer eating lettuce or strawberries grown on biosolids-amended farmland: dietary PFAS ingestion","Farmer applying biosolids to fields: dermal and inhalation contact with PFAS-laden sludge","Household using commercial compost containing PFAS from compostable packaging: garden soil contamination","Community relying on well water downgradient from biosolids-amended fields: drinking water PFAS"],"notes":"US biosolids: 4.75 million dry tons/yr, 60% land-applied (NRC 2002; EPA Biosolids Biennial Report). PFAS in biosolids: Venkatesan & Halden (2013, ES&T) first national survey. PFAS source: household products (nonstick cookware, stain repellents, food packaging), industrial dischargers (PFAS manufacturers, chrome platers), AFFF from airport/military base runoff. Crop uptake: Blaine et al. (2013, ES&T) — lettuce grown in biosolids-amended soil: PFOA 0.1-5 ng/g ww. Short-chain PFAS (PFBA, PFHxA) more mobile in plants than PFOS/PFOA. Stonyfield Farm, Arundel ME: Fred Stone dairy farm — 6th generation, PFOS in well water >300 ng/L after decades of biosolids application. Maine LD 1911 (effective 2022): banned land application of biosolids statewide — first in US. Michigan Oscoda Township: PFAS from biosolids linked to Wurtsmith AFB. Compostable packaging PFAS: Mamavation/EHN (2023): 64% of compostable food service items had total fluorine 10-300+ ppm. PFAS used as grease/moisture barrier in molded fiber food service. BPI certification: updated 2023 to require <100 ppm total fluorine. EPA PFAS Strategic Roadmap: committed to establishing PFAS limits in biosolids (timeline uncertain). No federal PFAS limit in biosolids or compost as of 2025. State action: ME (ban), VT (500 ppt PFOS in biosolids for land application), MI (developing limits), CA (monitoring program)."},"consumer_guidance":{"usage_warning":"Ask your compost supplier whether they test for PFAS (total fluorine). Avoid using compost derived from mixed food service packaging waste unless PFAS-tested. If your farmland has received biosolids, request PFAS soil testing and consider crop selection — root vegetables and grains show lower PFAS uptake than leafy greens. Test well water for PFAS if within 1 mile of biosolids-amended fields. Look for BPI-certified compostable products (now requires <100 ppm total fluorine). Support municipal PFAS source control programs to reduce PFAS loading to wastewater.","safer_alternatives":["BPI-certified PFAS-free compostable packaging (post-2023 certification standard)","Non-fluorinated grease barriers for compostable food service (wax, PLA coatings)","Thermal destruction of PFAS-impacted biosolids instead of land application","Biosolids treatment technologies: pyrolysis, incineration (850°C+) to destroy PFAS before land application"]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"EPA PFAS Action (Developing) + State Biosolids Bans + BPI Certification","citation":"EPA PFAS Strategic Roadmap (2021); Maine LD 1911 (2022); 40 CFR 503 (biosolids — no PFAS limits); EPA MCL for PFOA/PFOS 4 ng/L (2024 drinking water)","requirements":"EPA 40 CFR 503: biosolids land application standards — pollutant limits for metals (As, Cd, Cr, Cu, Pb, Hg, Mo, Ni, Se, Zn) but NO PFAS limits as of 2025. EPA PFAS Strategic Roadmap (2021): committed to risk assessment for PFAS in biosolids and potential rulemaking. EPA MCL for PFOA and PFOS: 4 ng/L each in drinking water (2024 final rule) — applies to drinking water systems, not biosolids directly. Maine LD 1911 (2022): banned land application of biosolids statewide. Vermont: 500 ppt PFOS screening level for biosolids. Michigan: developing PFAS biosolids limits. BPI Compostable Certification: <100 ppm total fluorine required (2023 standard update). No federal limits on PFAS in compost.","compliance_status":null,"effective_date":null,"enforcing_agency":"EPA / State environmental agencies / BPI (voluntary certification)","penalties":null,"source_ref":null}],"certifications":[],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":false,"disposal_guidance":"PFAS-contaminated biosolids should be incinerated at 850°C+ or higher for PFAS thermal destruction, or disposed in lined landfills (PFAS in leachate remains a concern). Compostable packaging: only compost items meeting BPI PFAS-free certification. PFAS-containing compost should not be applied to food-growing soil.","hazardous_waste":false,"expected_lifespan":"PFAS persistence in soil: decades to centuries (half-life of PFOS in soil estimated 8-12 years, PFOA 3-8 years; some PFAS are effectively permanent)"},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-mix-000018","compound_name":null,"role":"persistent_contaminant","typical_concentration":"total PFAS in biosolids 10-10,000 ug/kg; total fluorine in compostable packaging 10-300+ ppm"},{"hq_id":"hq-c-org-000649","compound_name":null,"role":"co_contaminant","typical_concentration":"bisphenol A in biosolids from thermal receipt paper and epoxy-lined can recycling"}],"identifiers":{"common_names":["pfas in compost and biosolids (sewage sludge, crop uptake, compostable packaging, farmland contamination, maine biosolids ban)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"General Mills","manufacturer":"General Mills","market_position":"mass_market","notable":"Major packaged food brand"},{"brand":"Kellogg's","manufacturer":"Kellanova","market_position":"mass_market","notable":"Cereal and dry food packaging"},{"brand":"Nature's Path","manufacturer":"Nature's Path","market_position":"premium","notable":"Organic packaged cereals"}],"sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-26"},{"type":"regulation","title":"EPA PFAS Action (Developing) + State Biosolids Bans + BPI Certification (EPA PFAS Strategic Roadmap (2021); Maine LD 1911 (2022); 40 CFR 503 (biosolids — no PFAS limits); EPA MCL for PFOA/PFOS 4 ng/L (2024 drinking water))","jurisdiction":"USA","citation":"EPA PFAS Strategic Roadmap (2021); Maine LD 1911 (2022); 40 CFR 503 (biosolids — no PFAS limits); EPA MCL for PFOA/PFOS 4 ng/L (2024 drinking water)","id":"src_371a0296"},{"id":"epa_pfas_mcl_2024","type":"regulatory","title":"US EPA: National Primary Drinking Water Regulations for PFAS — Final Rule (April 2024): Individual MCLs for PFOA/PFOS (4 ppt), PFNA/PFHxS/HFPO-DA (10 ppt), and Hazard Index for PFAS Mixtures","year":2024,"inherited_from_compound":"hq-c-mix-000018"},{"id":"iarc_135_pfas","type":"regulatory","title":"IARC Monographs Volume 135: Perfluorooctanoic Acid and Its Salts and Other Per- and Polyfluoroalkyl Substances — PFAS Carcinogenicity Framework, Group 1 Evidence, and Regulatory Context (2023)","year":2023,"inherited_from_compound":"hq-c-mix-000018"},{"id":"src_001","type":"database","title":"PubChem Compound CID 91511","url":"https://pubchem.ncbi.nlm.nih.gov/compound/91511","accessed":"2026-03-12","notes":"Chemical identity, properties, safety data","inherited_from_compound":"hq-c-org-000649"},{"id":"src_002","type":"epa","title":"EPA CompTox Chemicals Dashboard — DTXSID4044872","url":"https://comptox.epa.gov/dashboard/chemical/details/DTXSID4044872","accessed":"2026-03-12","notes":"Hazard, exposure, and toxicity data","inherited_from_compound":"hq-c-org-000649"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-26","timestamp":"2026-05-01T14:32:28.207Z"}}