{"query":{"parameter":"malathion","place":"US-MA","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-MA","US"],"parameter_keys":["cas:121-75-5"],"names_matched":[["malathion","cas:121-75-5"]],"match":"exact","order":"The place's own instruments first, then each place above it, each in its register's order"},"total":8,"offset":0,"returned":8,"next_offset":null,"rows":[{"id":"0b710a81896f6934","parameter":"Malathion","value":"0.1","value_num":0.1,"unit":"µg/L","statistic":"four_day_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:121-75-5","place":["US-MA"],"conditions":["receiving_water is freshwater","fresh (inland) waters, all classes (314 CMR 4.06(6)(d) Table 29a 'Fresh Water')"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","section":"314 CMR 4.06(6)(d) Table 29a","page":147,"quote":null}},{"id":"6d9a7e816775388c","parameter":"Malathion","value":"0.1","value_num":0.1,"unit":"µg/L","statistic":"four_day_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:121-75-5","place":["US-MA"],"conditions":["receiving_water is marine","coastal and marine waters, all classes (314 CMR 4.06(6)(d) Table 29a 'Coastal and Marine')"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","section":"314 CMR 4.06(6)(d) Table 29a","page":147,"quote":null}},{"id":"b61321983ae3f180","parameter":"Malathion","value":"0.1","value_num":0.1,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"cas:121-75-5","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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or file_url, a public https address of it."},"post":"/api/v1/certificate"}]}