AI-assisted research summary: This provision makes the Schedule 1, 2, and 3 drinking water standards part of the regulation and gives conditional deemed-compliance rules when water does not meet them.
Standards 1. The standards set out in Schedules 1, 2 and 3 are prescribed as drinking water quality standards for the purposes of the Act. O. Reg. 169/03, s. 1. Deemed compliance 2. (1) A person who, pursuant to section 10 of the Act or otherwise, has an obligation to ensure that water meets a standard set out in Schedule 1, 2 or 3 shall be deemed not to have contravened the obligation if, in circumstances where the water does not meet the standard, the person immediately contacts the medical officer of health and takes such other steps as are directed by the medical officer of health. O. Reg. 169/03, s. 2 (1). (2) Despite subsection (1), the owner or operating authority of a drinking water system that provides water that does not meet a standard set out in Schedule 1, 2 or 3 shall be deemed not to have contravened paragraph 1 of subsection 11 (1) of the Act only if the owner or operating authority ensures that the appropriate corrective action is taken under Schedule 17 or 18 to Ontario Regulation 170/03 (Drinking Water Systems). O. Reg. 169/03, s. 2 (2); O. Reg. 255/05, s. 1; O. Reg. 327/08, s. 1. 3. Omitted (provides for coming into force of provisions of the English version of this Regulation). O. Reg. 169/03, s. 3. SCHEDULE 1 MICROBIOLOGICAL STANDARDS Item Microbiological Parameter Standard (expressed as a maximum) 1. Escherichia coli (E. coli) Not detectable 2. Revoked: O. Reg. 248/06, s. 1. 3. Total coliforms Not detectable 4. Revoked: O. Reg. 248/06, s. 1. 5. Revoked: O. Reg. 248/06, s. 1. O. Reg. 169/03, Sched. 1; O. Reg. 248/06, s. 1. Schedule 2 CHEMICAL STANDARDS Item Chemical Parameter Standard (expressed as a maximum concentration in milligrams per litre) 1. Alachlor 0.005 2. Antimony 0.006 3. Arsenic 0.01 4. Atrazine + N-dealkylated metabolites 0.005 5. Azinphos-methyl 0.02 6. Barium 1.0 7. Benzene 0.001 8. Benzo(a)pyrene 0.00001 9. Boron 5.0 10. Bromate 0.01 11. Bromoxynil 0.005 12. Cadmium 0.005 13. Carbaryl 0.09 14. Carbofuran 0.09 15. Carbon Tetrachloride 0.002 16. Chloramines 3.0 16.1 Chlorate 1.0 16.2 Chlorite 1.0 17. Chlorpyrifos 0.09 18. Chromium 0.05 19. Cyanide 0.2 20. Diazinon 0.02 21. Dicamba 0.12 22. 1,2-Dichlorobenzene 0.2 23. 1,4-Dichlorobenzene 0.005 24. 1,2-Dichloroethane 0.005 25. 1,1-Dichloroethylene (vinylidene chloride) 0.014 26. Dichloromethane 0.05 27. 2,4-Dichlorophenol 0.9 28. 2,4-Dichlorophenoxy acetic acid (2,4-D) 0.1 29. Diclofop-methyl 0.009 30. Dimethoate 0.02 31. Dioxin and Furan 0.000000015 (Total toxic equivalents when compared with 2,3,7,8-TCDD (tetrachlorodibenzo-p-dioxin)) 32. Diquat 0.07 33. Diuron 0.15 33.1 Ethylbenzene 0.14 34. Fluoride 1.5 35. Glyphosate 0.28 35.1 Haloacetic acids 0.08 (expressed as a running annual average of quarterly results) 36. Lead 0.010 37. Malathion 0.19 38. Mercury 0.001 38.1 2-Methyl-4-chlorophenoxyacetic acid 0.1 39. Metolachlor 0.05 40. Metribuzin 0.08 41. Microcystin LR 0.0015 42. Monochlorobenzene 0.08 43. Nitrate (as nitrogen) 10.0 44. Nitrite (as nitrogen) 1.0 45. Revoked: O. Reg. 457/16, s. 1 (4). 46. Nitrilotriacetic Acid (NTA) 0.4 47. N-Nitrosodimethylamine (NDMA) 0.000009 48. Paraquat 0.01 49. Pentachlorophenol 0.06 50. Phorate 0.002 51. Picloram 0.19 52. Polychlorinated Biphenyls (PCB) 0.003 53. Prometryne 0.001 54. Selenium 0.05 55. Simazine 0.01 56. Terbufos 0.001 57. Tetrachloroethylene (perchloroethylene) 0.01 58. 2,3,4,6-Tetrachlorophenol 0.1 58.1 Toluene 0.06 59. Triallate 0.23 60. Trichloroethylene 0.005 61. 2,4,6-Trichlorophenol 0.005 62. Trifluralin 0.045 63. Trihalomethanes 0.100 (expressed as a running annual average of quarterly results) 64. Uranium 0.02 65. Vinyl Chloride 0.001 66. Xylenes 0.09 O. Reg. 373/15, s. 1; O. Reg. 457/16, s. 1. SCHEDULE 3 RADIOLOGICAL STANDARDS Table 1 Natural Radionuclides Item Radiological Parameter Standard (expressed as a maximum in becquerels per litre) 1. Beryllium-7 4000.0 2. Bismuth -210 70.0 3. Lead-210 0.1 4. Polonium-210 0.2 5. Radium-224 2.0 6. Radium-226 0.6 7. Radium-228 0.5 8. Thorium-228 2.0 9. Thorium-230 0.4 10. Thorium-232 0.1 11. Thorium-234 20.0 12. Uranium-234 4.0 13. Uranium-235 4.0 14. Uranium-238 4.0 Table 2 Artificial Radionuclides Item Radiological Parameter Standard (expressed as a maximum in becquerels per litre) 1. Americium-241 0.2 2. Antimony-122 50.0 3. Antimony-124 40.0 4. Antimony-125 100.0 5. Barium-140 40.0 6. Bromine-82 300.0 7. Calcium-45 200.0 8. Calcium-47 60.0 9. Carbon-14 200.0 10. Cerium-141 100.0 11. Cerium-144 20.0 12. Cesium-131 2000.0 13. Cesium-134 7.0 14. Cesium-136 50.0 15. Cesium-137 10.0 16. Chromium-51 3000.0 17. Cobalt-57 40.0 18. Cobalt-58 20.0 19. Cobalt-60 2.0 20. Gallium-67 500.0 21. Gold-198 90.0 22. Indium-111 400.0 23. Iodine-125 10.0 24. Iodine-129 1.0 25. Iodine-131 6.0 26. Iron-55 300.0 27. Iron-59 40.0 28. Manganese-54 200.0 29. Mercury-197 400.0 30. Mercury-203 80.0 31. Molybdenum-99 70.0 32. Neptunium-239 100.0 33. Niobium-95 200.0 34. Phosphorus-32 50.0 35. Plutonium-238 0.3 36. Plutonium-239 0.2 37. Plutonium-240 0.2 38. Plutonium-241 10.0 39. Rhodium-105 300.0 40. Rubidium-81 3000.0 41. Rubidium-86 50.0 42. Ruthenium-103 100.0 43. Ruthenium-106 10.0 44. Selenium-75 70.0 45. Silver-108m 70.0 46. Silver-110m 50.0 47. Silver-111 70.0 48. Sodium-22 50.0 49. Strontium-85 300.0 50. Strontium-89 40.0 51. Strontium-90 5.0 52. Sulphur-35 500.0 53. Technetium-99 200.0 54. Technetium-99m 7000.0 55. Tellurium-129m 40.0 56. Tellurium-131m 40.0 57. Tellurium-132 40.0 58. Thallium-201 2000.0 59. Tritium 7000.0 60. Ytterbium-169 100.0 61. Yttrium-90 30.0 62. Yttrium-91 30.0 63. Zinc-65 40.0 64. Zirconium-95 100.0 Notes: 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. O. Reg. 457/16, s. 2.