{"query":{"parameter":"nitrosamines","place":"US-DC","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-DC","US"],"parameter_keys":["cas:35576-91-1","name:nitrosamines","name:nitrosamines, other"],"names_matched":[["nitrosamines","cas:35576-91-1"],["nitrosamines","name:nitrosamines"],["nitrosamines other","name:nitrosamines, other"]],"match":"exact+contains","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":5,"offset":0,"returned":5,"next_offset":null,"rows":[{"id":"9bfff32ff0ba2d6f","parameter":"Nitrosamines","value":"600","value_num":600,"unit":"µg/L","statistic":"four_day_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:nitrosamines","place":["US-DC"],"conditions":["receiving_water is freshwater","Class C waters (protection and propagation of fish, shellfish, and wildlife; 21 DCMR 1101.1)"],"cite":{"instrument":"us_dc_wqs","title":"District of Columbia Water Quality Standards, 21 DCMR Chapter 11: §1104.8 Tables 1-3 (conventional constituents; Class C aquatic life CMC/CCC and Class D human health criteria for metals and organics)","issuer":"District of Columbia, Department of Energy and Environment","edition":"21 DCMR Chapter 11 as US EPA posts it in effect for CWA purposes (EPA's page lists it 'Effective December 17, 2025'; the posted file is dated 2025-06)","source_url":"https://www.epa.gov/system/files/documents/2025-06/dc_wqs.pdf","source_sha256":"a156fb1d7d915143baca625f2d21999f2cffde52ded465302748658d490501d5","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"21 DCMR 1104.8 Table 3","page":16,"quote":null}},{"id":"24c203b1677d1ed9","parameter":"Nitrosamines","value":"1.24, b","value_num":1.24,"unit":"µg/L","statistic":"thirty_day_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:nitrosamines","place":["US-DC"],"conditions":["receiving_water is freshwater","Class D waters (protection of human health related to consumption of fish and shellfish; 21 DCMR 1101.1)"],"cite":{"instrument":"us_dc_wqs","title":"District of Columbia Water Quality Standards, 21 DCMR Chapter 11: §1104.8 Tables 1-3 (conventional constituents; Class C aquatic life CMC/CCC and Class D human health criteria for metals and organics)","issuer":"District of Columbia, Department of Energy and Environment","edition":"21 DCMR Chapter 11 as US EPA posts it in effect for CWA purposes (EPA's page lists it 'Effective December 17, 2025'; the posted file is dated 2025-06)","source_url":"https://www.epa.gov/system/files/documents/2025-06/dc_wqs.pdf","source_sha256":"a156fb1d7d915143baca625f2d21999f2cffde52ded465302748658d490501d5","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"21 DCMR 1104.8 Table 3","page":16,"quote":null}},{"id":"a35e0297ed7aa639","parameter":"Nitrosamines","value":"0.0008","value_num":0.0008,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"name:nitrosamines","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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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":"Nitrosamines — 0.0008 1.24 1980"}}],"next":[{"tool":"check_values","says":"Has your user measured this? check_values sets each of their results beside every row held here, with a verdict and the row's cite.","arguments":{"place":"US-DC"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"nitrosamines\", value, unit}, ...], any other parameters too."},"post":"/api/v1/check"},{"tool":"read_certificate","says":"Has your user a laboratory certificate? read_certificate reads every row it prints, each with its page, and checks them against these limits.","arguments":{"place":"US-DC"},"needs":{"content_base64":"The laboratory's certificate (PDF) or its XLSX, XLS or CSV export, as base64; or file_url, a public https address of it."},"post":"/api/v1/certificate"}]}