{"query":{"parameter":"2 3 7 8 tetrachlorodibenzo p dioxin","place":"US-WY","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-WY","US"],"parameter_keys":["cas:1746-01-6","name:2, 3, 7, 8-tetrachlorodibenzo-p-dioxin","name:2,3,7,8−tetrachlorodibenzo−p−dioxin"],"names_matched":[["2 3 7 8 tetrachlorodibenzo p dioxin","cas:1746-01-6"],["2 3 7 8 tetrachlorodibenzo p dioxin","name:2, 3, 7, 8-tetrachlorodibenzo-p-dioxin"],["2 3 7 8 tetrachlorodibenzo p dioxin","name:2,3,7,8−tetrachlorodibenzo−p−dioxin"]],"match":"exact","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"},"total":11,"offset":0,"returned":11,"next_offset":null,"rows":[{"id":"778370c67abf5f38","parameter":"2,3,7,8-TCDD (Dioxin)","value":"0.000000005(f)","value_num":5e-9,"unit":"µg/L","statistic":"monthly_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:1746-01-6","place":["US-WY"],"conditions":["receiving_water is freshwater","surface waters of the state designated for drinking water (Chapter 1 Section 17)"],"cite":{"instrument":"us_wy_wqs","title":"Wyoming Water Quality Rules Chapter 1, Wyoming Surface Water Quality Standards: Table 7 aquatic life and Table 9 drinking water and fish consumption values","issuer":"State of Wyoming, Department of Environmental Quality (Water Quality Division)","edition":"Chapter 1 effective August 6, 2025 (Reference Number 020.0011.1.08062025, generated 08/12/2025), as US EPA posts it in effect for CWA purposes","source_url":"https://www.epa.gov/sites/default/files/2014-12/documents/wy-chapter1.pdf","source_sha256":"19dc9cc2926a62927b89bdaffb154e4a1b247b5135c0cebbfe3754c59c406437","fetched_at":"2026-10-14","section":"Wyoming WQRR Chapter 1 Table 9","page":27,"quote":null}},{"id":"ad7e37d43fdad624","parameter":"2,3,7,8-TCDD (Dioxin)","value":"0.000000005(f)","value_num":5e-9,"unit":"µg/L","statistic":"monthly_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:1746-01-6","place":["US-WY"],"conditions":["receiving_water is freshwater","surface waters of the state designated for fish consumption (Chapter 1 Section 18)"],"cite":{"instrument":"us_wy_wqs","title":"Wyoming Water Quality Rules Chapter 1, Wyoming Surface Water Quality Standards: Table 7 aquatic life and Table 9 drinking water and fish consumption values","issuer":"State of Wyoming, Department of Environmental Quality (Water Quality Division)","edition":"Chapter 1 effective August 6, 2025 (Reference Number 020.0011.1.08062025, generated 08/12/2025), as US EPA posts it in effect for CWA purposes","source_url":"https://www.epa.gov/sites/default/files/2014-12/documents/wy-chapter1.pdf","source_sha256":"19dc9cc2926a62927b89bdaffb154e4a1b247b5135c0cebbfe3754c59c406437","fetched_at":"2026-10-14","section":"Wyoming WQRR Chapter 1 Table 9","page":27,"quote":null}},{"id":"ea7f8eef4dbff55c","parameter":"2,3,7,8-TCDD (Dioxin)","value":"3 × 10 −","value_num":3,"unit":"mg/l","direction":"max","kind":"limit","medium":"drinking_water","level":"national","parameter_key":"cas:1746-01-6","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","section":"141.61","page":null,"quote":null,"column":"mcl"}},{"id":"cfbd2d10ee78d0e1","parameter":"2,3,7,8-TCDD (Dioxin)","value":"5.0E-9","value_num":5e-9,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"cas:1746-01-6","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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