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Ask for one by its name or CAS number."}},"total":34,"offset":0,"returned":34,"next_offset":null,"rows":[{"id":"076b88dffb2498d9","parameter":"Thallium","value":"6.3","value_num":6.3,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7440-28-0","place":["US-MO"],"conditions":["receiving_water is freshwater","waters designated for human health protection (fish consumption)"],"cite":{"instrument":"us_mo_wqs","title":"Missouri 10 CSR 20-7.031 Water Quality Standards: Table A1 criteria for designated uses, Table A2 equations, pH and the chloride-plus-sulfate limit","issuer":"State of Missouri, Clean Water Commission (Department of Natural Resources)","edition":"10 CSR 20-7.010 to 7.050, effective March 8, 2023, as US EPA posts it in effect for CWA purposes (cover July 31, 2023: EPA disapproved Table K's Sni-a-bar Creek dissolved oxygen criteria, the Joplin Turkey Creek zinc variance and some whole-body-contact use removals; no action on the Bolivar variance)","source_url":"https://www.epa.gov/system/files/documents/2023-07/mowqs.pdf","source_sha256":"edc4a64b3e9493d597a1d67fc1d5a3307c70c53cf6f35bfaf252722aba64277d","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"10 CSR 20-7.031 (5) Table A1","page":25,"quote":"Thallium 7440280 6.3"}},{"id":"63c81699837df0a1","parameter":"Thallium","value":"2","value_num":2,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7440-28-0","place":["US-MO"],"conditions":["receiving_water is freshwater","waters designated for drinking water supply"],"cite":{"instrument":"us_mo_wqs","title":"Missouri 10 CSR 20-7.031 Water Quality Standards: Table A1 criteria for designated uses, Table A2 equations, pH and the chloride-plus-sulfate limit","issuer":"State of Missouri, Clean Water Commission (Department of Natural Resources)","edition":"10 CSR 20-7.010 to 7.050, effective March 8, 2023, as US EPA posts it in effect for CWA purposes (cover July 31, 2023: EPA disapproved Table K's Sni-a-bar Creek dissolved oxygen criteria, the Joplin Turkey Creek zinc variance and some whole-body-contact use removals; no action on the Bolivar variance)","source_url":"https://www.epa.gov/system/files/documents/2023-07/mowqs.pdf","source_sha256":"edc4a64b3e9493d597a1d67fc1d5a3307c70c53cf6f35bfaf252722aba64277d","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"10 CSR 20-7.031 (5) Table A1","page":25,"quote":"Thallium 7440280 6.3 2"}},{"id":"1ce5583e4a209d85","parameter":"Thallium","value":"1.4","value_num":1.4,"unit":"mg/L","statistic":"composite","direction":"max","kind":"limit","medium":"product","level":"national","parameter_key":"cas:7440-28-0","place":["US"],"conditions":["(a) Table UTS identifies the hazardous constituents, along with the nonwastewater and wastewater treatment standard levels, that are used to regulate most prohibited hazardous wastes with numerical limits. 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Compliance with these treatment standards is measured by an analysis of grab samples, unless otherwise noted in the following Table UTS."],"cite":{"instrument":"us_40cfr268_48","title":"40 CFR 268.48 — Universal treatment standards: Table UTS, wastewater and nonwastewater treatment standards for the hazardous constituents of land-disposal-restricted wastes","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR, 40 CFR 268.48 as of 2026-10-13 (title 40 up to date as of that day; source note: 59 FR 48103, Sept. 19, 1994, as last amended at 76 FR 34156, June 13, 2011)","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-13/title-40.xml?part=268&section=268.48","source_sha256":"70b2e58a6b1e228e2c204acc69b69fab0d5a0347e35d569959073c3dc3ee4adb","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 268.48, Table UTS, Inorganic Constituents, wastewater standard","page":null,"quote":"Thallium 7440-28-0 1.4 0.20 mg/l TCLP"}},{"id":"6077d58f7ea7720d","parameter":"Thallium","value":"0.20 mg/l TCLP","value_num":0.2,"unit":"mg/L TCLP","statistic":"instant","direction":"max","kind":"limit","medium":"leachate","level":"national","parameter_key":"cas:7440-28-0","place":["US"],"conditions":["(a) Table UTS identifies the hazardous constituents, along with the nonwastewater and wastewater treatment standard levels, that are used to regulate most prohibited hazardous wastes with numerical limits. For determining compliance with treatment standards for underlying hazardous constituents as defined in § 268.2(i), these treatment standards may not be exceeded. Compliance with these treatment standards is measured by an analysis of grab samples, unless otherwise noted in the following Table UTS."],"cite":{"instrument":"us_40cfr268_48","title":"40 CFR 268.48 — Universal treatment standards: Table UTS, wastewater and nonwastewater treatment standards for the hazardous constituents of land-disposal-restricted wastes","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR, 40 CFR 268.48 as of 2026-10-13 (title 40 up to date as of that day; source note: 59 FR 48103, Sept. 19, 1994, as last amended at 76 FR 34156, June 13, 2011)","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-13/title-40.xml?part=268&section=268.48","source_sha256":"70b2e58a6b1e228e2c204acc69b69fab0d5a0347e35d569959073c3dc3ee4adb","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 268.48, Table UTS, Inorganic Constituents, nonwastewater standard","page":null,"quote":"Thallium 7440-28-0 1.4 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shellfish taken from it, not a drinking-water source (fresh or salt)"],"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); each criterion carries its publication year","source_url":"https://www.epa.gov/wqc/national-recommended-water-quality-criteria-human-health-criteria-table","source_sha256":"a0229d5a613672b46a000c5b9925dd3a23c3e05914bb020b7f739c69cecbb5fe","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"National Recommended Water Quality Criteria — Human Health Criteria Table","page":null,"quote":"Thallium (P) 7440280 0.24 0.47 2003"}},{"id":"b905c97764fe61d1","parameter":"Thallium (Soluble 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