{"query":{"parameter":"perchlorate","place":"US-CO","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-CO","US"],"parameter_keys":["cas:14797-73-0","cas:7601-90-3","cas:7790-98-9","cas:7791-03-9","cas:7778-74-7","cas:7601-89-0"],"names_matched":[["perchlorate","cas:14797-73-0"],["perchlorate","cas:7601-90-3"],["perchlorate","cas:7790-98-9"],["lithium perchlorate","cas:7791-03-9"],["potassium perchlorate","cas:7778-74-7"],["sodium perchlorate","cas:7601-89-0"],["perchloric acid lithium salt","cas:7791-03-9","perchloric acid"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order","not_sent":{"rows":9,"names":["~Lithium Perchlorate","~Potassium Perchlorate","~Sodium Perchlorate"],"says":"9 rows share a parameter key with a longer name holding \"perchlorate\" but are printed under names without these words (that key is wider than the name), or keyed to a CAS number \"perchlorate\" does not name (another substance, whatever words its name holds): not sent. Ask for one by its name or CAS number."}},"total":7,"offset":0,"returned":7,"next_offset":null,"rows":[{"id":"e30586cc19611ec8","parameter":"Perchlorate","value":"4.9","value_num":4.9,"unit":"µg/L","statistic":"monthly_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7790-98-9","place":["US-CO"],"conditions":["receiving_water is freshwater","segments classified for water supply (Table B note 2)"],"cite":{"instrument":"us_co_wqs","title":"Colorado Regulation No. 31 (5 CCR 1002-31) Basic Standards and Methodologies for Surface Water: Table B organic chemicals, Table III metals, Table IV metals at selected hardness","issuer":"State of Colorado, Water Quality Control Commission (Department of Public Health and Environment)","edition":"5 CCR 1002-31 effective December 31, 2024 (adopted August 21, 2024), the Secretary of State's official PDF; US EPA posts the same compilation in effect for CWA purposes (cover January 28, 2025: no 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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":"57a69739105d5ca1","parameter":"~Ammonium Perchlorate","value":"820","value_num":820,"unit":"mg/kg","direction":"max","kind":"guideline","medium":"soil","level":"national","parameter_key":"cas:7790-98-9","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 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export, as base64; or file_url, a public https address of it."},"post":"/api/v1/certificate"}]}