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Ask for one by its name or CAS number."}},"total":23,"offset":0,"returned":23,"next_offset":null,"rows":[{"id":"d0432fcbb1abd1f2","parameter":"Endosulfan Sulfate","value":"9.9","value_num":9.9,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:1031-07-8","place":["US-ID"],"conditions":["receiving_water is freshwater","surface waters designated for domestic water supply use (Table 2 'Water & Fish'; IDAPA 58.01.02.210.01.b)"],"cite":{"instrument":"us_id_wqs","title":"Idaho IDAPA 58.01.02 Water Quality Standards Section 210: numeric criteria for toxic substances for waters designated for aquatic life, recreation, or domestic water supply use; Section 250 aquatic life pH, dissolved gas and dissolved oxygen","issuer":"State of Idaho, Department of Environmental Quality","edition":"IDAPA 58.01.02 effective June 10, 2026, as US EPA posts it in effect for CWA 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