{"query":{"parameter":"perfluorohexanesulfonic acid","place":"US-AL","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-AL","US"],"parameter_keys":["cas:355-46-4","name:somma di pfas","name:somme des substances alkylees per et polyfluorees","name:sum of pfas","name:sum of the concentration of 25 per- and polyfluoroalkyl substances","name:summe pfas-20","name:summe pfas-4","name:hazard index pfas","cas:108427-53-8"],"names_matched":[["perfluorohexanesulfonic acid","cas:355-46-4"],["perfluorohexanesulfonic acid","name:somma di pfas"],["perfluorohexanesulfonic acid","name:somme des substances alkylees per et polyfluorees"],["perfluorohexanesulfonic acid","name:sum of pfas"],["perfluorohexanesulfonic acid","name:sum of the concentration of 25 per- and polyfluoroalkyl substances"],["perfluorohexanesulfonic acid","name:summe pfas-20"],["perfluorohexanesulfonic acid","name:summe pfas-4"],["hazard index pfas hfpo da pfbs pfhxs and pfna","name:hazard index pfas","pfhxs"],["perfluorohexane sulfonic acid pfhxs","cas:108427-53-8","pfhxs"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order","not_sent":{"rows":5,"names":["~Perfluorohexanesulfonate"],"says":"5 rows share a parameter key with a longer name holding \"perfluorohexanesulfonic acid\" but are printed under names without these words (that key is wider than the name), or keyed to a CAS number \"perfluorohexanesulfonic acid\" does not name (another substance, whatever words its name holds): not sent. 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SSL values are based on DAF=1"],"cite":{"instrument":"us_rsl_soil","title":"US EPA — Regional Screening Levels (RSLs), Summary Table (TR=1E-06, THQ=1.0), November 2024 — Soil","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"November 2024","source_url":"https://semspub.epa.gov/src/document/HQ/405270","source_sha256":"0160dc81b4f55d738a354a74de92488f149946ebfa7c6a6c64592f45348043d7","fetched_at":"2026-09-19","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":null,"page":null,"quote":null,"table":"ssl","column":"risque"}},{"id":"0b4eb22b9aa20827","parameter":"~Perfluorohexanesulfonic acid (PFHxS)","value":"4.2e-06","value_num":0.0000042,"unit":"mg/kg","direction":"max","kind":"printed_reference","medium":"soil","level":"national","parameter_key":"cas:355-46-4","place":["US"],"conditions":["Protection of Groundwater SSLs: MCL-based SSL (mg/kg); SSL values are based on DAF=1"],"cite":{"instrument":"us_rsl_soil","title":"US EPA — Regional Screening Levels (RSLs), Summary Table (TR=1E-06, THQ=1.0), November 2024 — Soil","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"November 2024","source_url":"https://semspub.epa.gov/src/document/HQ/405270","source_sha256":"0160dc81b4f55d738a354a74de92488f149946ebfa7c6a6c64592f45348043d7","fetched_at":"2026-09-19","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":null,"page":null,"quote":null,"table":"ssl","column":"mcl"}},{"id":"06fb4bbe02dbbe3b","parameter":"~Perfluorohexanesulfonic acid (PFHxS)","value":"0.39","value_num":0.39,"unit":"µg/L","direction":"max","kind":"guideline","medium":"drinking_water","level":"national","parameter_key":"cas:355-46-4","place":["US"],"conditions":["Tap Water (ug/L): Regional Screening Level (RSL) Summary Table (TR=1E-06, HQ=1) November 2024"],"cite":{"instrument":"us_rsl_tapwater","title":"US EPA — Regional Screening Levels (RSLs), Summary Table (TR=1E-06, THQ=1.0), November 2024 — Tap Water","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"November 2024","source_url":"https://semspub.epa.gov/src/document/HQ/405270","source_sha256":"0160dc81b4f55d738a354a74de92488f149946ebfa7c6a6c64592f45348043d7","fetched_at":"2026-09-19","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":null,"page":null,"quote":null,"table":"eau","column":"eau_robinet"}},{"id":"026a24b5cfde09ea","parameter":"Hazard Index PFAS (HFPO-DA, PFBS, PFHxS, and PFNA)","value":"1 (unitless)","value_num":1,"unit":"mg/l","direction":"max","kind":"guideline","medium":"drinking_water","level":"national","parameter_key":"name:hazard index pfas","place":["US"],"conditions":["40 CFR 141.2: Maximum contaminant level goals are nonenforceable health goals."],"cite":{"instrument":"us_npdwr","title":"40 CFR Part 141 — National Primary Drinking Water Regulations (eCFR, as of 2026-08-01)","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=141","source_sha256":"bd534eb2d8af38e141e1cd6236134a638298fbf14791b30279eeb47d815d7767","fetched_at":"2026-08-29","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"141.50, 141.61","page":null,"quote":null,"column":"mclg"}},{"id":"51d81347d05adcd0","parameter":"Hazard Index PFAS (HFPO-DA, PFBS, PFHxS, and PFNA)","value":"1 (unitless)","value_num":1,"unit":"mg/l","direction":"max","kind":"limit","medium":"drinking_water","level":"national","parameter_key":"name:hazard index pfas","place":["US"],"conditions":["40 CFR 141.2: Maximum contaminant level means the maximum permissible level of a contaminant in water which is delivered to any user of a public water system."],"cite":{"instrument":"us_npdwr","title":"40 CFR Part 141 — National Primary Drinking Water Regulations (eCFR, as of 2026-08-01)","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=141","source_sha256":"bd534eb2d8af38e141e1cd6236134a638298fbf14791b30279eeb47d815d7767","fetched_at":"2026-08-29","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"141.50, 141.61","page":null,"quote":null,"column":"mcl"}}],"next":[{"tool":"check_values","says":"Has your user measured this? check_values sets each of their results beside every row held here, with a verdict and the row's cite.","arguments":{"place":"US-AL"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"perfluorohexanesulfonic acid\", value, unit}, ...], any other parameters too."},"post":"/api/v1/check"},{"tool":"read_certificate","says":"Has your user a laboratory certificate? read_certificate reads every row it prints, each with its page, and checks them against these limits.","arguments":{"place":"US-AL"},"needs":{"content_base64":"The laboratory's certificate (PDF) or its XLSX, XLS or CSV export, as base64; or file_url, a public https address of it."},"post":"/api/v1/certificate"}]}