{"query":{"parameter":"iodine","place":"CA-ON","medium":null,"statistic":null,"kind":null},"searched":{"places":["CA-ON","CA"],"parameter_keys":["cas:7553-56-2","name:free residual iodine","name:iodine-125","name:iodine-129","name:iodine-131"],"names_matched":[["iodine","cas:7553-56-2"],["free residual iodine","name:free residual iodine"],["iodine 125","name:iodine-125"],["iodine 129","name:iodine-129"],["iodine 131","name:iodine-131"],["iodine 131 dissolved","name:iodine-131"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order"},"total":4,"offset":0,"returned":4,"next_offset":null,"rows":[{"id":"3e4d1881112a12e0","parameter":"Iodine","value":"100 µg/L","value_num":100,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7553-56-2","place":["CA-ON"],"conditions":["receiving_water is freshwater"],"cite":{"instrument":"ca_on_pwqo","title":"Provincial Water Quality Objectives (Ontario MOEE, Water Management: Policies, Guidelines, Provincial Water Quality Objectives, 1994) — Table 2, PWQOs and Interim PWQOs","issuer":"Ontario Ministry of Environment and Energy (MOEE; now Ministry of the Environment, Conservation and Parks)","edition":"MOEE July 1994 (reprinted February 1999), as published on ontario.ca (fetched 2026-10-09)","source_url":"https://www.ontario.ca/page/water-management-policies-guidelines-provincial-water-quality-objectives","source_sha256":"f4eddd3cd97cf5abb8678d040947bdaa2b4afae406f055948457d372d3b47931","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"Appendix A, Table 2 — Table of PWQOs and Interim PWQOs","page":null,"quote":"Iodine CAS No. 7553-56-2 100 µg/L (Interim PWQO )"}},{"id":"415a0ddae1248e79","parameter":"Iodine-125","value":"10.0","value_num":10,"unit":"Bq/L","direction":"max","kind":"limit","medium":"drinking_water","level":"regional","parameter_key":"name:iodine-125","place":["CA-ON"],"conditions":["drinking water a drinking water system provides (Safe Drinking Water Act, 2002; s. 2: a person who immediately contacts the medical officer of health, and takes corrective action under O. Reg. 170/03 Schedules 17-18, is deemed not to contravene)","Radionuclide concentrations that exceed the standard may be tolerated for a short period, as long as the annual average concentrations remain below the standard and the restriction (see immediately below) for multiple radionuclides is met. Restriction for multiple radionuclides: Based on International Commission on Radiological Protection (ICRP) Publication 26, if two or more radionuclides are present, the sum of the quotients of the observed concentration in becquerels per litre divided by the respective standard in becquerels per litre for each of the radionuclides detected must be less than or equal to one."],"cite":{"instrument":"ca_on_169_03","title":"Ontario Regulation 169/03, Ontario Drinking Water Quality Standards — Schedules 1-3","issuer":"Government of Ontario (Safe Drinking Water Act, 2002)","edition":"consolidation period January 1, 2020 - e-Laws currency date (October 12, 2026); last amendment O. Reg. 457/16","source_url":"https://www.ontario.ca/laws/regulation/030169","source_sha256":"b622b94b73c161ff6e2a474712cda6344eadfff705b8a5d312d57ce51df419d0","fetched_at":"2026-10-15","section":"Schedule 3, Radiological Standards, Table 2 Artificial Radionuclides, item 23","page":null,"quote":"23. Iodine-125 10.0"}},{"id":"2d26cc300d18876d","parameter":"Iodine-129","value":"1.0","value_num":1,"unit":"Bq/L","direction":"max","kind":"limit","medium":"drinking_water","level":"regional","parameter_key":"name:iodine-129","place":["CA-ON"],"conditions":["drinking water a drinking water system provides (Safe Drinking Water Act, 2002; s. 2: a person who immediately contacts the medical officer of health, and takes corrective action under O. Reg. 170/03 Schedules 17-18, is deemed not to contravene)","Radionuclide concentrations that exceed the standard may be tolerated for a short period, as long as the annual average concentrations remain below the standard and the restriction (see immediately below) for multiple radionuclides is met. Restriction for multiple radionuclides: Based on International Commission on Radiological Protection (ICRP) Publication 26, if two or more radionuclides are present, the sum of the quotients of the observed concentration in becquerels per litre divided by the respective standard in becquerels per litre for each of the radionuclides detected must be less than or equal to one."],"cite":{"instrument":"ca_on_169_03","title":"Ontario Regulation 169/03, Ontario Drinking Water Quality Standards — Schedules 1-3","issuer":"Government of Ontario (Safe Drinking Water Act, 2002)","edition":"consolidation period January 1, 2020 - e-Laws currency date (October 12, 2026); last amendment O. Reg. 457/16","source_url":"https://www.ontario.ca/laws/regulation/030169","source_sha256":"b622b94b73c161ff6e2a474712cda6344eadfff705b8a5d312d57ce51df419d0","fetched_at":"2026-10-15","section":"Schedule 3, Radiological Standards, Table 2 Artificial Radionuclides, item 24","page":null,"quote":"24. Iodine-129 1.0"}},{"id":"cbdbe674821f5e5c","parameter":"Iodine-131","value":"6.0","value_num":6,"unit":"Bq/L","direction":"max","kind":"limit","medium":"drinking_water","level":"regional","parameter_key":"name:iodine-131","place":["CA-ON"],"conditions":["drinking water a drinking water system provides (Safe Drinking Water Act, 2002; s. 2: a person who immediately contacts the medical officer of health, and takes corrective action under O. Reg. 170/03 Schedules 17-18, is deemed not to contravene)","Radionuclide concentrations that exceed the standard may be tolerated for a short period, as long as the annual average concentrations remain below the standard and the restriction (see immediately below) for multiple radionuclides is met. Restriction for multiple radionuclides: Based on International Commission on Radiological Protection (ICRP) Publication 26, if two or more radionuclides are present, the sum of the quotients of the observed concentration in becquerels per litre divided by the respective standard in becquerels per litre for each of the radionuclides detected must be less than or equal to one."],"cite":{"instrument":"ca_on_169_03","title":"Ontario Regulation 169/03, Ontario Drinking Water Quality Standards — Schedules 1-3","issuer":"Government of Ontario (Safe Drinking Water Act, 2002)","edition":"consolidation period January 1, 2020 - e-Laws currency date (October 12, 2026); last amendment O. Reg. 457/16","source_url":"https://www.ontario.ca/laws/regulation/030169","source_sha256":"b622b94b73c161ff6e2a474712cda6344eadfff705b8a5d312d57ce51df419d0","fetched_at":"2026-10-15","section":"Schedule 3, Radiological Standards, Table 2 Artificial Radionuclides, item 25","page":null,"quote":"25. Iodine-131 6.0"}}],"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":"CA-ON"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"iodine\", 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":"CA-ON"},"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"}]}