{"query":{"parameter":"chlorpyrifos","place":"US-MD","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-MD","US"],"parameter_keys":["cas:2921-88-2","cas:5598-13-0"],"names_matched":[["chlorpyrifos","cas:2921-88-2"],["chlorpyrifos methyl","cas:5598-13-0"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order","not_sent":{"rows":4,"names":["Chlorpyrifos Methyl"],"says":"4 rows share a parameter key with a longer name holding \"chlorpyrifos\" but are printed under names without these words (that key is wider than the name), or keyed to a CAS number \"chlorpyrifos\" does not name (another substance, whatever words its name holds): not sent. Ask for one by its name or CAS number."}},"total":12,"offset":0,"returned":12,"next_offset":null,"rows":[{"id":"219ea61c38c5ce99","parameter":"Chlorpyrifos","value":"0.083","value_num":0.083,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:2921-88-2","place":["US-MD"],"conditions":["receiving_water is freshwater"],"cite":{"instrument":"us_md_wqs","title":"COMAR 26.08.02.03-2 — Numerical Criteria for Toxic Substances in Surface Waters (Maryland), Tables 1, 4, 5 and 6","issuer":"State of Maryland, Department of the Environment (MDE)","edition":"Code of Maryland Regulations as served by the Division of State Documents on 2026-10-09","source_url":"https://dsd.maryland.gov/regulations/Pages/26.08.02.03-2.aspx","source_sha256":"9924bc5fb2d109930b06f840cd56b722bdab36dfe897e28897e658512be1f9bd","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"COMAR 26.08.02.03-2 G, Table 6 (fresh water acute)","page":null,"quote":"Chlorpyrifos 2921882 0.083 0.041 0.011 0.0056"}},{"id":"43fef2f759ae5f8c","parameter":"Chlorpyrifos","value":"0.041","value_num":0.041,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:2921-88-2","place":["US-MD"],"conditions":["receiving_water is freshwater"],"cite":{"instrument":"us_md_wqs","title":"COMAR 26.08.02.03-2 — Numerical Criteria for Toxic Substances in Surface Waters (Maryland), Tables 1, 4, 5 and 6","issuer":"State of Maryland, Department of the Environment (MDE)","edition":"Code of Maryland Regulations as served by the Division of State Documents on 2026-10-09","source_url":"https://dsd.maryland.gov/regulations/Pages/26.08.02.03-2.aspx","source_sha256":"9924bc5fb2d109930b06f840cd56b722bdab36dfe897e28897e658512be1f9bd","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"COMAR 26.08.02.03-2 G, Table 6 (fresh water chronic)","page":null,"quote":"Chlorpyrifos 2921882 0.083 0.041 0.011 0.0056"}},{"id":"f2ff2e8f2e0dabf0","parameter":"Chlorpyrifos","value":"0.011","value_num":0.011,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:2921-88-2","place":["US-MD"],"conditions":["receiving_water is marine","salt water (the table's Salt Water column)"],"cite":{"instrument":"us_md_wqs","title":"COMAR 26.08.02.03-2 — Numerical Criteria for Toxic Substances in Surface Waters (Maryland), Tables 1, 4, 5 and 6","issuer":"State of Maryland, Department of the Environment (MDE)","edition":"Code of Maryland Regulations as served by the Division of State Documents on 2026-10-09","source_url":"https://dsd.maryland.gov/regulations/Pages/26.08.02.03-2.aspx","source_sha256":"9924bc5fb2d109930b06f840cd56b722bdab36dfe897e28897e658512be1f9bd","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"COMAR 26.08.02.03-2 G, Table 6 (salt water acute)","page":null,"quote":"Chlorpyrifos 2921882 0.083 0.041 0.011 0.0056"}},{"id":"3a61280df0af8045","parameter":"Chlorpyrifos","value":"0.0056","value_num":0.0056,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:2921-88-2","place":["US-MD"],"conditions":["receiving_water is marine","salt water (the table's Salt Water column)"],"cite":{"instrument":"us_md_wqs","title":"COMAR 26.08.02.03-2 — Numerical Criteria for Toxic Substances in Surface Waters (Maryland), Tables 1, 4, 5 and 6","issuer":"State of Maryland, Department of the Environment (MDE)","edition":"Code of Maryland Regulations as served by the Division of State Documents on 2026-10-09","source_url":"https://dsd.maryland.gov/regulations/Pages/26.08.02.03-2.aspx","source_sha256":"9924bc5fb2d109930b06f840cd56b722bdab36dfe897e28897e658512be1f9bd","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"COMAR 26.08.02.03-2 G, Table 6 (salt water chronic)","page":null,"quote":"Chlorpyrifos 2921882 0.083 0.041 0.011 0.0056"}},{"id":"99cc26fd0fc70468","parameter":"Chlorpyrifos","value":"0.083","value_num":0.083,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"cas:2921-88-2","place":["US"],"conditions":["EPA's recommendation under Clean Water Act § 304(a): 'State and Tribal governments may use these criteria or use them as guidance in developing their own' — it binds a water once the state adopts it for the water's designated use","receiving_water is freshwater","Freshwater CMC (acute): criterion maximum concentration, acute"],"cite":{"instrument":"us_nrwqc_aquatic","title":"EPA National Recommended Water Quality Criteria — Aquatic Life Criteria Table (freshwater and saltwater CMC/CCC)","issuer":"U.S. Environmental Protection Agency","edition":"EPA web table, last updated on June 9, 2026 (fetched 2026-10-09); each criterion carries its publication year","source_url":"https://www.epa.gov/wqc/national-recommended-water-quality-criteria-aquatic-life-criteria-table","source_sha256":"be6b429558db9852c3456eb22c17046aa1a3335ee89e702e8afb793f9b5b25ec","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"National Recommended Aquatic Life Criteria table","page":null,"quote":"Chlorpyrifos 2921882 0.083 0.041 0.011 0.0056 1986"}},{"id":"fcce0faa80670cff","parameter":"Chlorpyrifos","value":"0.041","value_num":0.041,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"cas:2921-88-2","place":["US"],"conditions":["EPA's recommendation under Clean Water Act § 304(a): 'State and Tribal governments may use these criteria or use them as guidance in developing their own' — it binds a water once the state adopts it for the water's designated use","receiving_water is freshwater","Freshwater CCC (chronic): criterion continuous concentration, chronic"],"cite":{"instrument":"us_nrwqc_aquatic","title":"EPA National Recommended Water Quality Criteria — Aquatic Life Criteria Table (freshwater and saltwater CMC/CCC)","issuer":"U.S. Environmental Protection Agency","edition":"EPA web table, last updated on June 9, 2026 (fetched 2026-10-09); 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each criterion carries its publication year","source_url":"https://www.epa.gov/wqc/national-recommended-water-quality-criteria-aquatic-life-criteria-table","source_sha256":"be6b429558db9852c3456eb22c17046aa1a3335ee89e702e8afb793f9b5b25ec","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"National Recommended Aquatic Life Criteria table","page":null,"quote":"Chlorpyrifos 2921882 0.083 0.041 0.011 0.0056 1986"}},{"id":"f62200eabd82589c","parameter":"Chlorpyrifos","value":"0.0056","value_num":0.0056,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"cas:2921-88-2","place":["US"],"conditions":["EPA's recommendation under Clean Water Act § 304(a): 'State and Tribal governments may use these criteria or use them as guidance in developing their own' — it binds a water once the state adopts it for the water's designated use","receiving_water is marine","Saltwater CCC (chronic): criterion continuous concentration, chronic"],"cite":{"instrument":"us_nrwqc_aquatic","title":"EPA National Recommended Water Quality Criteria — Aquatic Life Criteria Table (freshwater and saltwater CMC/CCC)","issuer":"U.S. Environmental Protection Agency","edition":"EPA web table, last updated on June 9, 2026 (fetched 2026-10-09); 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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":"not verified"},"section":null,"page":null,"quote":null,"table":"ssl","column":"risque"}},{"id":"ad32294afe8a32b6","parameter":"Chlorpyrifos","value":"8.4","value_num":8.4,"unit":"µg/L","direction":"max","kind":"guideline","medium":"drinking_water","level":"national","parameter_key":"cas:2921-88-2","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-MD"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"chlorpyrifos\", 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-MD"},"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"}]}