{"query":{"parameter":"barium","place":"US-KS","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-KS","US"],"parameter_keys":["cas:7440-39-3"],"names_matched":[["barium","cas:7440-39-3"]],"match":"exact","order":"The place's own instruments first, then each place above it, each in its register's order"},"total":11,"offset":0,"returned":11,"next_offset":null,"rows":[{"id":"2d06924821b494a9","parameter":"Barium (total)","value":"1,000","value_num":1000,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7440-39-3","place":["US-KS"],"conditions":["receiving_water is freshwater","points of domestic water supply diversion on classified waters designated for domestic water supply use (a water's designated uses: the Kansas surface water register; not evaluated)"],"cite":{"instrument":"us_ks_wqs","title":"Kansas Surface Water Quality Standards, Tables of Numeric Criteria (K.A.R. 28-16-28e): Table 1a by designated use, Table 1b formulas, Table 1g dissolved oxygen, pH and temperature, Table 1h natural background","issuer":"State of Kansas, Department of Health and Environment (Bureau of Water)","edition":"Kansas surface water quality standards: tables of numeric criteria, dated July 1, 2023, adopted by reference in K.A.R. 28-16-28e(e) (amended November 8, 2024), as US EPA posts it in effect for CWA purposes (effective March 31, 2025)","source_url":"https://www.epa.gov/system/files/documents/2023-01/kswqs-numeric-criteria.pdf","source_sha256":"11e107ef12fbc69f241a0aa01685313369c1300cf11d9ef43e3ef6f63614e27e","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"Kansas SWQS tables of numeric criteria, Table 1a","page":4,"quote":"barium, total 7440393 a a a a a 1,000"}},{"id":"23defa4735979a51","parameter":"Barium","value":"0.0090","value_num":0.009,"unit":"Kg/kkg (or pounds per 1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7440-39-3","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart AY—Potassium Iodide Production Subcategory","existing sources (BPT)","table: Subpart AY—Potassium Iodide"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"40 CFR 415.512 (BPT)","page":null,"quote":"Barium 0.0090 0.0030"}},{"id":"bd5b007e48c3213b","parameter":"Barium","value":"0.0030","value_num":0.003,"unit":"Kg/kkg (or pounds per 1,000 lb) of product","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7440-39-3","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart AY—Potassium Iodide Production Subcategory","existing sources (BPT)","table: Subpart AY—Potassium Iodide"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"40 CFR 415.512 (BPT)","page":null,"quote":"Barium 0.0090 0.0030"}},{"id":"3aa74ccbc014635f","parameter":"Barium","value":"2","value_num":2,"unit":"mg/l","direction":"max","kind":"guideline","medium":"drinking_water","level":"national","parameter_key":"cas:7440-39-3","place":["US"],"conditions":["40 CFR 141.2: Maximum contaminant level goals are nonenforceable health goals."],"cite":{"instrument":"us_npdwr","title":"40 CFR Part 141 — National Primary Drinking Water Regulations (eCFR, as of 2026-08-01)","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=141","source_sha256":"bd534eb2d8af38e141e1cd6236134a638298fbf14791b30279eeb47d815d7767","fetched_at":"2026-08-29","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"141.51, 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