{"query":{"parameter":"alkalinity as caco3","place":"US-MO","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-MO","US"],"parameter_keys":["name:alkalinity"],"names_matched":[["alkalinity as caco3","name:alkalinity"]],"match":"exact","order":"The place's own instruments first, then each place above it, each in its register's order"},"total":2,"offset":0,"returned":2,"next_offset":null,"rows":[{"id":"9816ba41a8ef394a","parameter":"Alkalinity (as CaCO3)","value":"20,000","value_num":20000,"unit":"µg/L","statistic":"four_day_avg","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:alkalinity","place":["US-MO"],"conditions":["receiving_water is freshwater","waters designated for aquatic life protection (Missouri Use Designation Dataset; Tables G and H)"],"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":"unchanged"},"section":"10 CSR 20-7.031 (5) Table A1","page":25,"quote":"Alkalinity (minimum CaCO3) 20,000"}},{"id":"9013fa4a27aa4b3e","parameter":"Alkalinity","value":"20000","value_num":20000,"unit":"µg/L","direction":"min","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"name:alkalinity","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","Freshwater CCC (chronic): criterion continuous concentration, chronic"],"cite":{"instrument":"us_nrwqc_aquatic","title":"EPA National Recommended Water Quality Criteria — Aquatic Life Criteria Table (freshwater and saltwater CMC/CCC)","issuer":"U.S. Environmental Protection Agency","edition":"EPA web table, last updated on June 9, 2026 (fetched 2026-10-09); each criterion carries its publication year","source_url":"https://www.epa.gov/wqc/national-recommended-water-quality-criteria-aquatic-life-criteria-table","source_sha256":"be6b429558db9852c3456eb22c17046aa1a3335ee89e702e8afb793f9b5b25ec","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"National Recommended Aquatic Life Criteria table","page":null,"quote":"Alkalinity — — 20000 — — 1986"}}],"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-MO"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"alkalinity as caco3\", 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-MO"},"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"}]}