{"hq_id":"hq-p-hom-000230","name":"Bleach for Emergency Water Disinfection (EPA 8 Drops/Gallon, Concentration Decay)","category":{"primary":"household","secondary":"emergency","tags":["bleach","water disinfection","emergency","sodium hypochlorite","EPA","concentration","chlorine","purification"]},"product_tier":"HOM","overall_risk_level":"low","description":"Household bleach (sodium hypochlorite) is EPA's recommended emergency water disinfection method: 8 drops (1/8 tsp) of 6% bleach per gallon (or 6 drops of 8.25% bleach), wait 30 minutes, water should have slight chlorine smell. Critical concern: bleach concentration decays over time — 6% bleach loses ~20% potency per year at room temperature, faster in heat. After 1 year, a '6% bleach' bottle may be 4.8% or lower. Splash-free and scented bleach contain additives and MUST NOT be used for water disinfection. Only plain, unscented sodium hypochlorite bleach.","synthesis":{"derived_risk_level":"moderate_to_high","synthesis_confidence":0.673,"synthesis_method":"compound_composition","context_used":"human_child","context_source":"product_users","exposure_modifier":1,"vulnerability_escalated":true,"escalation_reason":"Child exposure group","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 (chlorine sensitivity), immunocompromised (inadequate disinfection with degraded bleach)","overall_risk":"low","primary_concerns":["Bleach concentration degrades ~20%/year (inadequate disinfection with old bleach)","Scented or splash-free bleach additives not safe for drinking water","Under-dosing leaves pathogens; over-dosing causes GI irritation","Cloudy water requires pre-filtering AND double dose"],"exposure_routes":"Oral (drinking bleach-disinfected water — trace chlorine residual)"},"exposure":{"routes":["oral"],"contact_types":["oral_direct"],"users":["adult","child"],"duration":"event-based","frequency":"emergency","scenarios":["Emergency water disinfection with household bleach (EPA method)","Using old bleach with degraded concentration (inadequate disinfection)","Accidental use of scented or splash-free bleach (additives in drinking water)","Over-concentration causing chlorine taste/GI irritation"],"notes":"EPA/Red Cross emergency water disinfection: 8 drops unscented 6% bleach per gallon clear water (16 drops if cloudy). 6 drops of 8.25% bleach per gallon. Wait 30 minutes — slight chlorine smell confirms adequate dose. If no smell, repeat dose and wait 15 minutes. CRITICAL: bleach degrades — sodium hypochlorite loses ~20% potency/year. Buy new bleach annually for emergency kit. Only use UNSCENTED bleach with sodium hypochlorite as sole active ingredient. No splash-free, no scented, no 'ultra' with added surfactants. Calcium hypochlorite (pool shock, 65-73%) stores much longer than liquid bleach — 1/4 tsp per 2 gallons (prepper standard). Boiling for 1 minute is preferred disinfection method when fuel is available (kills everything, no chemicals)."},"consumer_guidance":{"usage_warning":"Use ONLY plain, unscented household bleach (sodium hypochlorite 6% or 8.25%). 8 drops per gallon (6% bleach) or 6 drops (8.25%). Wait 30 minutes — must smell slightly of chlorine. Buy new bleach ANNUALLY for emergency kit (concentration degrades 20%/year). Pre-filter cloudy water through cloth, then double the bleach dose. Boiling 1 minute is preferred when fuel available.","safer_alternatives":["Boiling for 1 minute (preferred — kills everything, no chemicals)","Calcium hypochlorite granules (pool shock — stores years vs months for liquid)","Water purification tablets (Aquatabs, Potable Aqua — measured doses)","LifeStraw or Sawyer filter (mechanical filtration, no chemicals needed)"]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"EPA Emergency Water Disinfection Guidance","citation":"EPA 816-F-09-006","requirements":"Guidance for emergency disinfection of drinking water using household bleach. 8 drops/gallon at 6% NaOCl. Not a regulation — emergency public health guidance.","compliance_status":null,"effective_date":null,"enforcing_agency":"EPA / Red Cross / FEMA","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":"Bleach bottle: recycling. Expired bleach: pour down drain with running water.","hazardous_waste":false,"expected_lifespan":"6-12_months_effective"},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000055","compound_name":null,"role":"disinfectant","typical_concentration":null}],"identifiers":{"common_names":["bleach for emergency water disinfection (epa 8 drops/gallon, concentration decay)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"Clorox","manufacturer":"Clorox","market_position":"mass_market","notable":"Market-leading bleach brand"},{"brand":"Purex","manufacturer":"Henkel","market_position":"mass_market","notable":"Budget bleach brand"},{"brand":"Seventh Generation","manufacturer":"Unilever","market_position":"premium","notable":"Chlorine-free bleach alternative"}],"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 Emergency Water Disinfection Guidance (EPA 816-F-09-006)","jurisdiction":"USA","citation":"EPA 816-F-09-006","id":"src_3aeb2ec8"},{"id":"atsdr_hypochlorite","type":"report","title":"ATSDR Medical Management Guidelines for Sodium Hypochlorite","year":2014,"inherited_from_compound":"hq-c-org-000055"},{"id":"aapcc_bleach","type":"report","title":"American Association of Poison Control Centers: Bleach and Hypochlorite Exposure Data","year":2022,"inherited_from_compound":"hq-c-org-000055"},{"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":"2026-05-14T01:27:34.973Z"}}