{"query":{"parameter":"barium","place":"US-NH","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-NH","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":12,"offset":0,"returned":12,"next_offset":null,"rows":[{"id":"103bb699992b98cd","parameter":"Barium","value":"1.0 mgl","value_num":1000,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7440-39-3","place":["US-NH"],"conditions":["receiving_water is freshwater","water and fish ingestion (Table 1703.1's 'Water & Fish Ingestion' column; held for fresh water, tidal water not being drunk)"],"cite":{"instrument":"us_nh_wqs","title":"New Hampshire Env-Wq 1700 Surface Water Quality Regulations: Table 1703-1 water quality criteria for toxic substances (fresh and marine acute/chronic aquatic life; human health), and class dissolved oxygen and pH","issuer":"State of New Hampshire, Department of Environmental Services","edition":"Env-Wq 1700 effective December 13, 2022 as US EPA posts it in effect for CWA purposes (cover page April 6, 2023), with the human health columns from the February 13, 2015 rule EPA also posts (its 2022 revisions still under EPA review); the state re-adopted Env-Wq 1700 effective 2-26-25 (#14203), not what EPA posts","source_url":"https://www.epa.gov/system/files/documents/2023-04/wqs-nh-chapter1700-2022.pdf","source_sha256":"6749401e33fb746b1a37e31e356dbaa9ccff1f936edc9cd3948b1bae47c796f2","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"Env-Wq 1703.21 Table 1703.1 (2015)","page":20,"quote":null}},{"id":"6366a89149fc1149","parameter":"Barium","value":"100.0","value_num":100,"unit":"mg/L","direction":"max","kind":"threshold","medium":"leachate","level":"national","parameter_key":"cas:7440-39-3","place":["US"],"conditions":["(a) A solid waste (except manufactured gas plant waste) exhibits the characteristic of toxicity if, using the Toxicity Characteristic Leaching Procedure, test Method 1311 in “Test Methods for Evaluating Solid Waste, Physical/Chemical Methods,” EPA Publication SW-846, as incorporated by reference in § 260.11 of this chapter, the extract from a representative sample of the waste contains any of the contaminants listed in table 1 at the concentration equal to or greater than the respective value given in that table. Where the waste contains less than 0.5 percent filterable solids, the waste itself, after filtering using the methodology outlined in Method 1311, is considered to be the extract for the purpose of this section."],"cite":{"instrument":"us_40cfr261_24","title":"40 CFR 261.24 — Toxicity characteristic: Table 1, maximum concentration of contaminants for the toxicity characteristic (TCLP regulatory levels)","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR, 40 CFR 261.24 as of 2026-10-13 (title 40 up to date as of that day)","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-13/title-40.xml?part=261&section=261.24","source_sha256":"3a1ec9b0d3051c70e471e359275657b0fa6d98e80927d2217e82b2dbbca60961","fetched_at":"2026-10-15","section":"40 CFR 261.24, Table 1","page":null,"quote":"D005 Barium 7440-39-3 100.0"}},{"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, 141.62","page":null,"quote":null,"column":"mclg"}},{"id":"bf6bf892e4d01b8a","parameter":"Barium","value":"2","value_num":2,"unit":"mg/l","direction":"max","kind":"limit","medium":"drinking_water","level":"national","parameter_key":"cas:7440-39-3","place":["US"],"conditions":["40 CFR 141.2: Maximum contaminant level means the maximum permissible level of a contaminant in water which is delivered to any user of a public water system."],"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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