{"query":{"parameter":"benzidine","place":"US-SD","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-SD","US"],"parameter_keys":["cas:92-87-5","cas:91-94-1"],"names_matched":[["benzidine","cas:92-87-5"],["dichloro 3 3 benzidine","cas:91-94-1"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order; rows for a marine receiving water after the rest, as none of the place's own rows names a marine, salt, estuarine, coastal or ocean water","not_sent":{"rows":9,"names":["3,3'-Dichlorobenzidine","Dichlorobenzidine, 3,3'-"],"says":"9 rows share a parameter key with a longer name holding \"benzidine\" but are printed under names without these words (that key is wider than the name): not sent. Ask for one by its name or CAS number."}},"total":9,"offset":0,"returned":9,"next_offset":null,"rows":[{"id":"0e0d9e77b61dfd05","parameter":"Benzidine","value":"0.00014","value_num":0.00014,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:92-87-5","place":["US-SD"],"conditions":["receiving_water is freshwater","waters assigned the beneficial use of domestic water supply (a water's uses: chapters 74:51:02 lakes and 74:51:03 streams)"],"cite":{"instrument":"us_sd_wqs","title":"South Dakota Surface Water Quality Standards (ARSD 74:51:01): criteria by beneficial use, Appendix B toxic pollutant criteria, radionuclide and dissolved gas limits","issuer":"State of South Dakota, Water Management Board (Department of Agriculture and Natural Resources)","edition":"ARSD chapter 74:51:01, Surface Water Quality, effective August 17, 2023 (49 SDR 96, May 14, 2023 the latest amendment printed), as US EPA posts it in effect for CWA purposes","source_url":"https://www.epa.gov/sites/default/files/2014-12/documents/sd-wqs.pdf","source_sha256":"84e4cd1bcfc7954e7393230459ee9d98f7b9c39e0b29724e6b897bdb73f4ddcc","fetched_at":"2026-10-14","section":"ARSD 74:51:01 Appendix B","page":41,"quote":"Benzidine(4) 92875 0.00014"}},{"id":"cb8282f972c00ca1","parameter":"Benzidine","value":"0.011","value_num":0.011,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:92-87-5","place":["US-SD"],"conditions":["receiving_water is freshwater","waters assigned a fish life propagation use (2-6) or fish and wildlife propagation, recreation, and stock watering (9) (a water's uses: chapters 74:51:02 lakes and 74:51:03 streams)"],"cite":{"instrument":"us_sd_wqs","title":"South Dakota Surface Water Quality Standards (ARSD 74:51:01): criteria by beneficial use, Appendix B toxic pollutant criteria, radionuclide and dissolved gas limits","issuer":"State of South Dakota, Water Management Board (Department of Agriculture and Natural Resources)","edition":"ARSD chapter 74:51:01, Surface Water Quality, effective August 17, 2023 (49 SDR 96, May 14, 2023 the latest amendment printed), as US EPA posts it in effect for CWA purposes","source_url":"https://www.epa.gov/sites/default/files/2014-12/documents/sd-wqs.pdf","source_sha256":"84e4cd1bcfc7954e7393230459ee9d98f7b9c39e0b29724e6b897bdb73f4ddcc","fetched_at":"2026-10-14","section":"ARSD 74:51:01 Appendix B","page":41,"quote":"Benzidine(4) 92875 0.00014 0.011"}},{"id":"eda4dc39079ecf13","parameter":"Benzidine","value":"0.00014","value_num":0.00014,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"cas:92-87-5","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","consumption of water + organism: a water designated a drinking-water source and for fish and shellfish (a designated use the state assigns)"],"cite":{"instrument":"us_nrwqc_human_health","title":"EPA National Recommended Water Quality Criteria — Human Health Criteria Table (water + organism, organism only)","issuer":"U.S. Environmental Protection Agency","edition":"EPA web table (fetched 2026-10-09); 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or file_url, a public https address of it."},"post":"/api/v1/certificate"}]}