{"query":{"parameter":"perfluorooctane sulfonic acid","place":"US-VA","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-VA","US"],"parameter_keys":["cas:1763-23-1","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","cas:45298-90-6","name:perfluorooctane sulfonate"],"names_matched":[["perfluorooctane sulfonic acid","cas:1763-23-1"],["perfluorooctane sulfonic acid","name:somma di pfas"],["perfluorooctane sulfonic acid","name:somme des substances alkylees per et polyfluorees"],["perfluorooctane sulfonic acid","name:sum of pfas"],["perfluorooctane sulfonic acid","name:sum of the concentration of 25 per- and polyfluoroalkyl substances"],["perfluorooctane sulfonic acid","name:summe pfas-20"],["perfluorooctane sulfonic acid","name:summe pfas-4"],["acide perfluo rooctanesulfonique et ses derives pfos","cas:45298-90-6","pfos"],["perfluoroctane sulfonate pfos","name:perfluorooctane sulfonate","pfos"],["perfluorooctane sulfonate pfos","cas:45298-90-6","pfos"],["perfluorooctane sulfonate pfos","name:perfluorooctane sulfonate","pfos"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order","not_sent":{"rows":8,"names":["~Perfluorooctanesulfonate","Perfluorooctane Sulfonate (PFOS)"],"says":"8 rows share a parameter key with a longer name holding \"perfluorooctane sulfonic acid\" but are printed under names without these words (that key is wider than the name), or keyed to a CAS number \"perfluorooctane sulfonic acid\" does not name (another substance, whatever words its name holds): not sent. Ask for one by its name or CAS number."}},"total":6,"offset":0,"returned":6,"next_offset":null,"rows":[{"id":"9a5f2303b25ca089","parameter":"PFOS","value":"0.0000040","value_num":0.000004,"unit":"mg/l","direction":"max","kind":"limit","medium":"drinking_water","level":"national","parameter_key":"cas:1763-23-1","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":"not verified"},"section":"141.61","page":null,"quote":null,"column":"mcl"}},{"id":"ae120ae02a9751c6","parameter":"~Perfluorooctanesulfonic acid (PFOS)","value":"0.0063","value_num":0.0063,"unit":"mg/kg","direction":"max","kind":"guideline","medium":"soil","level":"national","parameter_key":"cas:1763-23-1","place":["US"],"conditions":["Resident Soil (mg/kg)"],"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":"not verified"},"section":null,"page":null,"quote":null,"table":"sols","column":"residentiel"}},{"id":"f5f412ab8d80e06d","parameter":"~Perfluorooctanesulfonic acid (PFOS)","value":"0.058","value_num":0.058,"unit":"mg/kg","direction":"max","kind":"guideline","medium":"soil","level":"national","parameter_key":"cas:1763-23-1","place":["US"],"conditions":["Industrial Soil (mg/kg)"],"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":"not verified"},"section":null,"page":null,"quote":null,"table":"sols","column":"industriel"}},{"id":"788d1b1a241e96af","parameter":"~Perfluorooctanesulfonic acid (PFOS)","value":"1.5e-05","value_num":0.000015,"unit":"mg/kg","direction":"max","kind":"guideline","medium":"soil","level":"national","parameter_key":"cas:1763-23-1","place":["US"],"conditions":["Protection of Groundwater SSLs: Risk-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":"not verified"},"section":null,"page":null,"quote":null,"table":"ssl","column":"risque"}},{"id":"e6f6469a935c69b4","parameter":"~Perfluorooctanesulfonic acid (PFOS)","value":"3e-05","value_num":0.00003,"unit":"mg/kg","direction":"max","kind":"printed_reference","medium":"soil","level":"national","parameter_key":"cas:1763-23-1","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":"not verified"},"section":null,"page":null,"quote":null,"table":"ssl","column":"mcl"}},{"id":"aa74dfacc7d8898e","parameter":"~Perfluorooctanesulfonic acid (PFOS)","value":"0.002","value_num":0.002,"unit":"µg/L","direction":"max","kind":"guideline","medium":"drinking_water","level":"national","parameter_key":"cas:1763-23-1","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":"not verified"},"section":null,"page":null,"quote":null,"table":"eau","column":"eau_robinet"}}],"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-VA"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"perfluorooctane sulfonic 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-VA"},"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"}]}