{"hq_id":"hq-p-hom-000164","name":"Lead Service Line and Lead Plumbing (Pre-1986)","category":{"primary":"household","secondary":"infrastructure","tags":["lead pipe","lead service line","drinking water","corrosion","EPA LCRI"]},"product_tier":"HOM","overall_risk_level":"extreme","description":"Lead service lines (LSLs) connecting municipal water mains to homes, and interior lead solder/brass fixtures in pre-1986 buildings. EPA estimates 9.2 million LSLs remain in the US. Lead and Copper Rule Improvements (LCRI, 2024) requires full LSL replacement within 10 years. Partial LSL replacement can temporarily increase lead levels due to galvanic corrosion at dissimilar metal junctions. Corrosion control treatment (orthophosphate) reduces but does not eliminate lead leaching.","synthesis":{"derived_risk_level":"extreme","synthesis_confidence":0.744,"synthesis_method":"compound_composition","context_used":"human_infant","context_source":"product_users","exposure_modifier":1.38,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":1,"compounds_total":1,"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, children, pregnant women — no safe blood lead level","overall_risk":"extreme","primary_concerns":["9.2 million lead service lines remain in US","Lead is a neurodevelopmental toxicant with no safe exposure level","Flint MI demonstrated catastrophic public health consequences","Partial replacement temporarily increases lead due to galvanic corrosion"],"exposure_routes":"Oral via drinking water"},"exposure":{"routes":["oral"],"contact_types":["oral_direct"],"users":["adult","child","infant","pregnant"],"duration":"continuous","frequency":"daily","scenarios":["Daily drinking water consumption through lead service line","First-draw water after overnight stagnation (highest lead)","Infant formula preparation with lead-contaminated water","Hot water from tap (dissolves more lead than cold)"],"notes":"Flint MI water crisis (2014-2019): corrosion control failure caused citywide lead poisoning. EPA LCRI (2024): all LSLs must be replaced within 10 years. Until replaced: flush cold water 30-60 seconds before drinking, use NSF 53 filter, never use hot tap for drinking/cooking."},"consumer_guidance":{"usage_warning":"Determine if your home has a lead service line (check utility records or scratch test on pipe entering home — lead is soft/silver). Flush cold water 30-60 sec before drinking. Never use hot tap for cooking/drinking. Use NSF 53 certified filter.","safer_alternatives":["Full lead service line replacement (utility responsibility under LCRI)","NSF 53 certified point-of-use filter at kitchen tap","Bottled water for infant formula preparation until LSL replaced"],"red_flags":[{"indicator":"Aging infrastructure without inspection or testing","meaning":"Degradation increases contamination risk over time.","action":"Test or inspect per recommended schedule."}],"green_flags":[{"indicator":"NSF or third-party certification","meaning":"Independent testing for safety standards.","verification":"Check for NSF, UL, or equivalent certification marks."}],"what_to_ask":[{"question":"What certifications does this product or system carry?","why_it_matters":"Certification verifies compliance with health-based standards.","good_answer":"NSF, UL, or equivalent third-party certification.","bad_answer":"No certification or self-certified."}],"alternatives":[{"name":"Full lead service line replacement","notes":"utility responsibility under LCRI"},{"name":"NSF 53 certified point-of-use filter at kitchen tap","notes":"Alternative"},{"name":"Bottled water for infant formula preparation until LSL replaced","notes":"Alternative"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"EPA Lead and Copper Rule Improvements (LCRI, 2024)","citation":"40 CFR 141-143","requirements":"Full LSL replacement within 10 years. Action level 15 ppb, trigger level 10 ppb. Corrosion control treatment required.","compliance_status":null,"effective_date":"2024-10-08","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":true,"disposal_guidance":"LSL replacement handled by licensed contractor. Lead pipe: scrap metal.","hazardous_waste":true,"expected_lifespan":"50-100_years"},"formulation":{"form":"varies","key_ingredients":[{"hq_id":"hq-c-ino-000001","name":"Lead (Pb)","role":"pipe_material","concentration_pct":"variable"}],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-ino-000001","compound_name":null,"role":"pipe_material","typical_concentration":"variable"}],"identifiers":{"common_names":["lead service line and lead plumbing (pre-1986)"],"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 Lead and Copper Rule Improvements (LCRI, 2024) (40 CFR 141-143)","jurisdiction":"USA","year":2024,"citation":"40 CFR 141-143","id":"src_b8425732"},{"id":"src_001","type":"cdc","title":"CDC - Lead Poisoning Prevention","url":"https://www.cdc.gov/lead-prevention/","accessed":"2026-01-13","relevance":"Blood lead reference values, no safe level doctrine","inherited_from_compound":"hq-c-ino-000001"},{"id":"src_002","type":"who","title":"WHO - Lead Poisoning Fact Sheet","url":"https://www.who.int/news-room/fact-sheets/detail/lead-poisoning-and-health","year":2024,"accessed":"2026-01-13","relevance":"Global burden statistics, health effects","inherited_from_compound":"hq-c-ino-000001"},{"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":"2026-05-14T01:25:53.518Z"}}