{"hq_id":"hq-p-hom-000156","name":"PFAS in Drinking Water (Municipal and Well Water)","category":{"primary":"household","secondary":"water_quality","tags":["PFAS","forever chemicals","drinking water","EPA MCL","water filter","GenX"]},"product_tier":"HOM","overall_risk_level":"high","description":"Per- and polyfluoroalkyl substances (PFAS) contamination in US drinking water affecting an estimated 200+ million Americans. EPA finalized Maximum Contaminant Levels (MCLs) in 2024: 4 ppt for PFOA and PFOS individually. Sources: industrial discharge, military AFFF foam, biosolid application, landfill leachate. PFAS are 'forever chemicals' — they do not break down in the environment or the human body (half-life 4-8 years for PFOS).","synthesis":{"derived_risk_level":"severe","synthesis_confidence":0.713,"synthesis_method":"compound_composition","context_used":"human_infant","context_source":"product_users","exposure_modifier":1.38,"vulnerability_escalated":true,"escalation_reason":"Infant exposure group","compounds_resolved":2,"compounds_total":2,"synthesis_date":"2026-05-09","synthesis_version":"1.2.0","methodology_note":"exposure_modifier and adjusted_magnitude are computed from ALETHEIA-calibrated heuristics (route × duration × frequency multipliers, clamped to [0.5, 1.4]). Multipliers are directionally informed by EPA Exposure Factors Handbook (2011) and CalEPA OEHHA but are not regulatory consensus. See /api/methodology for full disclosure."},"hazard_summary":{"sensitive_populations":"infants (formula preparation), pregnant women, immunocompromised","overall_risk":"high","primary_concerns":["PFOA — IARC Group 1 carcinogen (2023), linked to kidney and testicular cancer","PFOS — persistent organic pollutant, endocrine disruptor, half-life 4-8 years in humans","200+ million Americans estimated exposed above EPA MCL levels","Forever chemicals — do not break down in environment or human body"],"exposure_routes":"Oral via drinking water (primary); formula preparation; cooking"},"exposure":{"routes":["oral"],"contact_types":["oral_direct"],"users":["adult","child","infant","pregnant"],"duration":"continuous","frequency":"daily","scenarios":["Daily drinking water consumption (2-3 L/day adults)","Infant formula preparation with PFAS-contaminated water","Cooking with contaminated water concentrates PFAS in food","Showering/bathing (minimal dermal absorption for long-chain PFAS)"],"notes":"EPA MCL rule (April 2024): 4 ppt PFOA, 4 ppt PFOS, Hazard Index for PFHxS/PFNA/HFPO-DA/PFBS. Utilities have until 2029 to comply. NSF 53 and NSF 401 certified activated carbon filters remove 90%+ of PFOA/PFOS. Reverse osmosis removes 99%+. Standard pitcher filters (Brita) provide moderate PFAS reduction."},"consumer_guidance":{"usage_warning":"Test your water for PFAS (home test kits available from Cyclopure, SimpleLab). Install NSF 53-certified activated carbon or reverse osmosis filter at kitchen tap. Check EWG PFAS contamination map for your water utility. Do not use contaminated water for infant formula preparation.","safer_alternatives":["NSF 53/401 certified activated carbon filter (removes 90%+ PFOA/PFOS)","Reverse osmosis system (removes 99%+ PFAS)","Bottled water from verified PFAS-free source (temporary)","Whole-house PFAS filtration for well water"],"red_flags":[{"indicator":"Product involved in active regulatory review or litigation","meaning":"Safety profile under scrutiny.","action":"Monitor regulatory developments and consider alternatives."}],"green_flags":[{"indicator":"Third-party testing or regulatory certification","meaning":"Independent safety verification.","verification":"Check for relevant certifications."}],"what_to_ask":[{"question":"What is the current regulatory status of this product?","why_it_matters":"Active regulatory review may indicate emerging safety concerns.","good_answer":"Compliant with current standards and monitoring developments.","bad_answer":"No awareness of regulatory status."}],"alternatives":[{"name":"NSF 53/401 certified activated carbon filter","notes":"removes 90%+ PFOA/PFOS"},{"name":"Reverse osmosis system","notes":"removes 99%+ PFAS"},{"name":"Bottled water from verified PFAS-free source","notes":"temporary"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"EPA PFAS National Primary Drinking Water Regulation (2024)","citation":"89 FR 32532","requirements":"MCLs: PFOA 4 ppt, PFOS 4 ppt. Hazard Index for PFHxS/PFNA/HFPO-DA/PFBS. Compliance by 2029.","compliance_status":null,"effective_date":"2024-04-10","enforcing_agency":"EPA","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":"Spent filter cartridges: regular waste (PFAS bound to carbon).","hazardous_waste":false,"expected_lifespan":"varies"},"formulation":{"form":"varies","key_ingredients":[{"hq_id":"hq-c-org-000020","name":"PFOA (Perfluorooctanoic acid)","role":"contaminant","concentration_pct":"trace-100+ ppt"},{"hq_id":"hq-c-org-000121","name":"PFNA (Perfluorononanoic acid)","role":"contaminant","concentration_pct":"trace-100+ ppt"}],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000020","compound_name":null,"role":"contaminant","typical_concentration":"trace-100+ ppt"},{"hq_id":"hq-c-org-000121","compound_name":null,"role":"contaminant","typical_concentration":"trace-100+ ppt"}],"identifiers":{"common_names":["pfas in drinking water (municipal and well water)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"SC Johnson","manufacturer":"SC Johnson","market_position":"mass_market","notable":"Household product conglomerate"},{"brand":"Clorox","manufacturer":"Clorox","market_position":"mass_market","notable":"Household cleaning market leader"},{"brand":"3M","manufacturer":"3M","market_position":"mass_market","notable":"Home safety and maintenance products"}],"brand_examples_disclaimer":"Representative branded products of this category. Concerning ingredients listed in materials.concerning[] apply to the category, not necessarily to every named brand. Specific formulations vary by SKU and may have changed since this record was written; consult the brand's current ingredient label before drawing brand-level conclusions.","sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-25"},{"type":"regulation","title":"EPA PFAS National Primary Drinking Water Regulation (2024) (89 FR 32532)","jurisdiction":"USA","year":2024,"citation":"89 FR 32532","id":"src_286dd6ed"},{"id":"iarc_135","type":"regulatory","title":"IARC Monographs Volume 135: Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonic Acid (PFOS)","year":2023,"inherited_from_compound":"hq-c-org-000020"},{"id":"epa_pfoa_2024","type":"regulatory","title":"US EPA: PFAS National Primary Drinking Water Regulation; PFOA MCL 4 ppt, MCLG zero","year":2024,"inherited_from_compound":"hq-c-org-000020"},{"id":"iarc_135_pfas","type":"regulatory","title":"IARC Monographs Volume 135: Perfluorooctanoic Acid and Its Salts and Other Per- and Polyfluoroalkyl Substances — PFNA, PFHxS, PFUnDA, PFDA Group 1 Classifications (2023)","year":2023,"inherited_from_compound":"hq-c-org-000121"},{"id":"epa_pfas_mcl_2024","type":"regulatory","title":"US EPA: National Primary Drinking Water Regulations for PFAS (April 2024 Final Rule) — Individual MCLs for PFOA (4 ppt), PFOS (4 ppt), PFNA (10 ppt), PFHxS (10 ppt), HFPO-DA (10 ppt); Hazard Index for Mixtures","year":2024,"inherited_from_compound":"hq-c-org-000121"},{"type":"regulatory","title":"US Environmental Protection Agency (EPA)","jurisdiction":"USA","id":"src_defdd418","extraction":"description_reference"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:26:35.105Z"}}