{"hq_id":"hq-p-hom-000221","name":"UV Water Disinfection System (Point-of-Entry, Maintenance)","category":{"primary":"household","secondary":"water_treatment","tags":["UV disinfection","ultraviolet","water","bacteria","virus","Giardia","turbidity","well water"]},"product_tier":"HOM","overall_risk_level":"negligible","description":"UV-C (254nm) water disinfection systems for point-of-entry (whole-house) or point-of-use treatment. Effective against bacteria, viruses, and protozoa (Giardia, Cryptosporidium) without chemicals — no disinfection byproducts. Limitations: requires clear water (turbidity >1 NTU dramatically reduces efficacy), does not remove chemical contaminants, UV lamp requires annual replacement (output drops below effective dose after ~9,000 hours), and provides no residual disinfection (bacteria can regrow in downstream plumbing).","synthesis":{"derived_risk_level":"extreme","synthesis_confidence":0.744,"synthesis_method":"compound_composition","context_used":"human_child","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":"general population (UV improves water safety)","overall_risk":"negligible","primary_concerns":["Expired UV lamp providing false sense of security (output below effective dose)","Turbidity reduces UV efficacy — pre-filtration required for well water","No residual disinfection (bacteria can regrow in downstream pipes)","UV alone does not remove chemical contaminants"],"exposure_routes":"None from UV itself — product improves water safety"},"exposure":{"routes":["oral"],"contact_types":["oral_direct"],"users":["adult","child"],"duration":"continuous","frequency":"daily","scenarios":["Well water microbial disinfection (primary use case)","UV lamp effectiveness declining over time without replacement","Turbid water: UV ineffective above 1 NTU (pre-filtration required)","No residual disinfection: bacteria can regrow in downstream plumbing"],"notes":"UV is chemical-free disinfection — no chlorine taste, no DBPs. Dose: EPA requires 40 mJ/cm² for 4-log virus inactivation. NSF 55 Class A: 40 mJ/cm² (disinfection of microbiologically unsafe water). NSF 55 Class B: supplemental treatment only. UV does NOT remove chemicals, heavy metals, or dissolved contaminants — pair with carbon filter or RO for comprehensive treatment. Replace UV lamp annually regardless of visual appearance (UV output drops below effective dose)."},"consumer_guidance":{"usage_warning":"Replace UV lamp annually (output drops below effective dose after ~9,000 hours). Pre-filter turbid well water before UV treatment (sediment + carbon). UV does NOT remove chemicals — pair with carbon filter for comprehensive treatment. Choose NSF 55 Class A for primary disinfection of unsafe water.","safer_alternatives":["UV IS a safe disinfection alternative (zero chemicals, zero DBPs)","UV + carbon filter (microbial + chemical treatment)","UV + RO (comprehensive treatment)","NSF 55 Class A certified systems for primary disinfection"],"red_flags":[{"indicator":"Water quality not tested or treatment system not maintained","meaning":"Unknown contaminant exposure or treatment failure.","action":"Test water. Maintain treatment systems per manufacturer schedule."}],"green_flags":[{"indicator":"NSF-certified treatment system with current maintenance","meaning":"Verified contaminant reduction with functioning system.","verification":"Check NSF certification and maintenance schedule compliance."}],"what_to_ask":[{"question":"What specific contaminants does this system remove, and at what efficiency?","why_it_matters":"No single system removes everything. Match treatment to your specific water quality.","good_answer":"NSF-certified for specific contaminants with published reduction data.","bad_answer":"Generic claims without specific contaminant testing."}],"alternatives":[{"name":"UV IS a safe disinfection alternative","notes":"zero chemicals, zero DBPs"},{"name":"UV + carbon filter","notes":"microbial + chemical treatment"},{"name":"UV + RO","notes":"comprehensive treatment"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"NSF/ANSI 55 (UV Water Treatment)","citation":"NSF/ANSI 55","requirements":"Class A: 40 mJ/cm² (primary disinfection of unsafe water). Class B: supplemental treatment of already safe water.","compliance_status":null,"effective_date":null,"enforcing_agency":"NSF International","penalties":null,"source_ref":null}],"certifications":[{"name":"NSF 55 Class A","issuer":"NSF International","standard":"NSF/ANSI 55","scope":"UV microbiological treatment for disinfection of contaminated water."}],"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":"UV lamp: mercury-containing (recycle as fluorescent lamp). Housing: regular waste.","hazardous_waste":true,"expected_lifespan":"10-15_years"},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-ino-000002","compound_name":null,"role":"component_material","typical_concentration":null}],"identifiers":{"common_names":["uv water disinfection system (point-of-entry, maintenance)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"Viqua","manufacturer":"Trojan Technologies","market_position":"professional","notable":"Professional UV water treatment"},{"brand":"SteriPEN","manufacturer":"Katadyn","market_position":"mass_market","notable":"Portable UV water purifier"},{"brand":"HALO","manufacturer":"RGF Environmental","market_position":"premium","notable":"Whole-house UV water system"}],"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":"NSF/ANSI 55 (UV Water Treatment)","jurisdiction":"USA","citation":"NSF/ANSI 55","id":"src_42253de0"},{"id":"iarc_100c","type":"regulatory","title":"IARC Monographs Volume 100C: Arsenic and Arsenic Compounds","year":2012,"inherited_from_compound":"hq-c-ino-000002"},{"id":"epa_arsenic_iris","type":"regulatory","title":"US EPA IRIS Assessment: Arsenic, Inorganic","year":1998,"inherited_from_compound":"hq-c-ino-000002"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:29:11.656Z"}}