{"query":{"parameter":"chromium iii","place":"US-AK","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-AK","US"],"parameter_keys":["cas:16065-83-1","name:chromium ii iii","cas:7440-47-3","name:chromium (+3)","name:chromium +3, total"],"names_matched":[["chromium iii","cas:16065-83-1"],["chromium ii iii","name:chromium ii iii"],["chromium 3","cas:7440-47-3","chromium 3"],["chromium 3","name:chromium (+3)","chromium 3"],["chromium 3 total","name:chromium +3, total","chromium 3"],["chromium 3 total recoverable","name:chromium (+3)","chromium 3"],["chromium and chromium compounds metallic divalent and trivalent","name:chromium ii iii","chromium trivalent"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order","not_sent":{"rows":2524,"names":["Chromium","Chromium (total)","Total chromium","Total Chromium","Chromium (Total)","Chromium (T)","Cr","Chromium, total"],"says":"2524 rows share a parameter key with a longer name holding \"chromium iii\" but are printed under names without these words (that key is wider than the name), or keyed to a CAS number \"chromium iii\" does not name (another substance, whatever words its name holds): not sent. Ask for one by its name or CAS number."}},"total":12,"offset":0,"returned":12,"next_offset":null,"rows":[{"id":"ed94d20310eefd0e","parameter":"Chromium III","value":"See Appendix A (1-hr avg) 11 dissolved 20, 25","unit":"µg/L","statistic":"hourly_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:16065-83-1","place":["US-AK"],"conditions":["receiving_water is freshwater","fresh water designated for growth and propagation of fish, shellfish, other aquatic life, and wildlife (fresh: salinity 1 ppt or less, 95th percentile; 18 AAC 70.990(80))","hardness-dependent: Appendix A's equation of the receiving water's hardness"],"cite":{"instrument":"us_ak_wqs","title":"Alaska Water Quality Criteria Manual for Toxic and Other Deleterious Organic and Inorganic Substances (fresh and marine aquatic life, human health, water supply), with 18 AAC 70.020(b) dissolved inorganic substances and marine salinity","issuer":"State of Alaska, Department of Environmental Conservation","edition":"Toxics Manual as amended through September 8, 2022, adopted by reference in 18 AAC 70, as US EPA posts it in effect for CWA purposes (effective April 14, 2023; cover April 24, 2023); 18 AAC 70 as EPA posts it effective January 8, 2026 (rows from it name their own source)","source_url":"https://www.epa.gov/system/files/documents/2023-05/akwqs-toxics-manual.pdf","source_sha256":"c835973dac59a2b48a376b34d11333eba7ff7a0f024cee0864e42470a2283b37","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"Alaska Toxics Manual (2022), Table of criteria","page":12,"quote":null}},{"id":"0ddbd2f4a87d1766","parameter":"Chromium III","value":"See Appendix A (4-day avg) 12 dissolved 20, 25","unit":"µg/L","statistic":"four_day_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:16065-83-1","place":["US-AK"],"conditions":["receiving_water is freshwater","fresh water designated for growth and propagation of fish, shellfish, other aquatic life, and wildlife (fresh: salinity 1 ppt or less, 95th percentile; 18 AAC 70.990(80))","hardness-dependent: Appendix A's equation of the receiving water's hardness"],"cite":{"instrument":"us_ak_wqs","title":"Alaska Water Quality Criteria Manual for Toxic and Other Deleterious Organic and Inorganic Substances (fresh and marine aquatic life, human health, water supply), with 18 AAC 70.020(b) dissolved inorganic substances and marine salinity","issuer":"State of Alaska, Department of Environmental Conservation","edition":"Toxics Manual as amended through September 8, 2022, adopted by reference in 18 AAC 70, as US EPA posts it in effect for CWA purposes (effective April 14, 2023; cover April 24, 2023); 18 AAC 70 as EPA posts it effective January 8, 2026 (rows from it name their own source)","source_url":"https://www.epa.gov/system/files/documents/2023-05/akwqs-toxics-manual.pdf","source_sha256":"c835973dac59a2b48a376b34d11333eba7ff7a0f024cee0864e42470a2283b37","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"Alaska Toxics Manual (2022), Table of criteria","page":12,"quote":null}},{"id":"f7e7e982fe5f3a70","parameter":"Chromium (III)","value":"570","value_num":570,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"cas:16065-83-1","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 CMC (acute): criterion maximum concentration, acute","corresponds to a hardness of 100 mg/L as CaCO3 (the table's value; the criterion is a function of hardness)"],"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":"Chromium (III) (P) 16065831 570 74 — — 1995"}},{"id":"8be5c44fff00162f","parameter":"Chromium (III)","value":"exp{0.8190 [ln(hardness)] + 3.7256} × CF, CF = 0.316","unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"cas:16065-83-1","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 CMC (acute), computed at the receiving water's hardness (mg/L as CaCO3) by the printed equation; never evaluated here"],"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":"Appendix B — Parameters for Calculating Freshwater Dissolved Metals Criteria That Are Hardness-Dependent","page":null,"quote":"Chromium III 0.8190 3.7256 0.8190 0.6848 0.316 0.860"}},{"id":"0255141d4eae87c6","parameter":"Chromium (III)","value":"74","value_num":74,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"cas:16065-83-1","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","corresponds to a hardness of 100 mg/L as CaCO3 (the table's value; the criterion is a function of hardness)"],"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":"Chromium (III) (P) 16065831 570 74 — — 1995"}},{"id":"e745fb99b39e6663","parameter":"Chromium (III)","value":"exp{0.8190 [ln(hardness)] + 0.6848} × CF, CF = 0.860","unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"national","parameter_key":"cas:16065-83-1","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), computed at the receiving water's hardness (mg/L as CaCO3) by the printed equation; never evaluated here"],"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":"Appendix B — Parameters for Calculating Freshwater Dissolved Metals Criteria That Are Hardness-Dependent","page":null,"quote":"Chromium III 0.8190 3.7256 0.8190 0.6848 0.316 0.860"}},{"id":"89bfca74185a9ba3","parameter":"Chromium(III) (Soluble Compounds)","value":"85000","value_num":85000,"unit":"mg/kg","direction":"max","kind":"guideline","medium":"soil","level":"national","parameter_key":"cas:16065-83-1","place":["US"],"conditions":["Resident Soil (mg/kg)"],"cite":{"instrument":"us_rsl_soil","title":"US EPA — Regional Screening Levels (RSLs), Summary Table (TR=1E-06, THQ=1.0), November 2024 — Soil","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"November 2024","source_url":"https://semspub.epa.gov/src/document/HQ/405270","source_sha256":"0160dc81b4f55d738a354a74de92488f149946ebfa7c6a6c64592f45348043d7","fetched_at":"2026-09-19","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":null,"page":null,"quote":null,"table":"sols","column":"residentiel"}},{"id":"873b643e9364904c","parameter":"Chromium(III) (Soluble Compounds)","value":"360000","value_num":360000,"unit":"mg/kg","direction":"max","kind":"guideline","medium":"soil","level":"national","parameter_key":"cas:16065-83-1","place":["US"],"conditions":["Industrial Soil (mg/kg)"],"cite":{"instrument":"us_rsl_soil","title":"US EPA — Regional Screening Levels (RSLs), Summary Table (TR=1E-06, THQ=1.0), November 2024 — Soil","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"November 2024","source_url":"https://semspub.epa.gov/src/document/HQ/405270","source_sha256":"0160dc81b4f55d738a354a74de92488f149946ebfa7c6a6c64592f45348043d7","fetched_at":"2026-09-19","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":null,"page":null,"quote":null,"table":"sols","column":"industriel"}},{"id":"1402c5aeb7e7555c","parameter":"Chromium(III), Insoluble Salts","value":"120000","value_num":120000,"unit":"mg/kg","direction":"max","kind":"guideline","medium":"soil","level":"national","parameter_key":"cas:16065-83-1","place":["US"],"conditions":["Resident Soil (mg/kg)"],"cite":{"instrument":"us_rsl_soil","title":"US EPA — Regional Screening Levels (RSLs), Summary Table (TR=1E-06, THQ=1.0), November 2024 — Soil","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"November 2024","source_url":"https://semspub.epa.gov/src/document/HQ/405270","source_sha256":"0160dc81b4f55d738a354a74de92488f149946ebfa7c6a6c64592f45348043d7","fetched_at":"2026-09-19","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":null,"page":null,"quote":null,"table":"sols","column":"residentiel"}},{"id":"e37e396648c7b821","parameter":"Chromium(III), Insoluble Salts","value":"1800000","value_num":1800000,"unit":"mg/kg","direction":"max","kind":"guideline","medium":"soil","level":"national","parameter_key":"cas:16065-83-1","place":["US"],"conditions":["Industrial Soil (mg/kg)"],"cite":{"instrument":"us_rsl_soil","title":"US EPA — Regional Screening Levels (RSLs), Summary Table (TR=1E-06, THQ=1.0), November 2024 — Soil","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"November 2024","source_url":"https://semspub.epa.gov/src/document/HQ/405270","source_sha256":"0160dc81b4f55d738a354a74de92488f149946ebfa7c6a6c64592f45348043d7","fetched_at":"2026-09-19","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":null,"page":null,"quote":null,"table":"sols","column":"industriel"}},{"id":"ce302f7434d10510","parameter":"Chromium(III), Insoluble Salts","value":"40000000","value_num":40000000,"unit":"mg/kg","direction":"max","kind":"guideline","medium":"soil","level":"national","parameter_key":"cas:16065-83-1","place":["US"],"conditions":["Protection of Groundwater SSLs: Risk-based SSL (mg/kg); SSL values are based on DAF=1"],"cite":{"instrument":"us_rsl_soil","title":"US EPA — Regional Screening Levels (RSLs), Summary Table (TR=1E-06, THQ=1.0), November 2024 — Soil","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"November 2024","source_url":"https://semspub.epa.gov/src/document/HQ/405270","source_sha256":"0160dc81b4f55d738a354a74de92488f149946ebfa7c6a6c64592f45348043d7","fetched_at":"2026-09-19","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":null,"page":null,"quote":null,"table":"ssl","column":"risque"}},{"id":"52c6f5ace5c2e247","parameter":"Chromium(III), Insoluble Salts","value":"22000","value_num":22000,"unit":"µg/L","direction":"max","kind":"guideline","medium":"drinking_water","level":"national","parameter_key":"cas:16065-83-1","place":["US"],"conditions":["Tap Water (ug/L): Regional Screening Level (RSL) Summary Table (TR=1E-06, HQ=1) November 2024"],"cite":{"instrument":"us_rsl_tapwater","title":"US EPA — Regional Screening Levels (RSLs), Summary Table (TR=1E-06, THQ=1.0), November 2024 — Tap Water","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"November 2024","source_url":"https://semspub.epa.gov/src/document/HQ/405270","source_sha256":"0160dc81b4f55d738a354a74de92488f149946ebfa7c6a6c64592f45348043d7","fetched_at":"2026-09-19","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":null,"page":null,"quote":null,"table":"eau","column":"eau_robinet"}}],"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-AK"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"chromium iii\", 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-AK"},"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"}]}