Water Quality Standards

Have a lab test and are curious what the results mean?  Here is a list of the drinking water standards for the jurisdiction I live in.  They show the maximum acceptable level of many contaminants present in drinking water.  This is not a complete list, just the parameters legislated by the government.

Parameter followed by the maximum allowable level

Microbiological Parameters

1. Escherichia coli (E. coli): Not detectable

2. Total coliforms : Not detectable

Chemical Parameters

1. Alachlor: 0.005 mg/l

2. Aldicarb: 0.009 mg/l

3. Aldrin + Dieldrin: 0.0007 mg/l

4. Antimony: 0.006 mg/l

5. Arsenic: 0.025 mg/l

6. Atrazine + N-dealkylated metabolites: 0.005 mg/l

7. Azinphos-methyl: 0.02 mg/l

8. Barium: 1.0  mg/l

9. Bendiocarb: 0.04 mg/l

10. Benzene: 0.005 mg/l

11. Benzo(a)pyrene: 0.00001 mg/l

12. Boron: 5.0 mg/l

13. Bromate: 0.01 mg/l

14. Bromoxynil:  0.005 mg/l

15. Cadmium: 0.005 mg/l

16. Carbaryl: 0.09 mg/l

17. Carbofuran: 0.09 mg/l

18. Carbon Tetrachloride:  0.005 mg/l

19. Chloramines: 3.0 mg/l

20. Chlordane (Total): 0.007 mg/l

21. Chlorpyrifos: 0.09 mg/l

22. Chromium: 0.05 mg/l

23. Cyanazine: 0.01 mg/l

24. Cyanide: 0.2 mg/l

25. Diazinon: 0.02 mg/l

26. Dicamba: 0.12 mg/l

27. 1,2-Dichlorobenzene: 0.2 mg/l

28. 1,4-Dichlorobenzene: 0.005 mg/l

29. Dichlorodiphenyltrichloroethane (DDT) + metabolites: 0.03 mg/l

30. 1,2-dichloroethane: 0.005 mg/l

31. 1,1-Dichloroethylene (vinylidene chloride): 0.014 mg/l

32. Dichloromethane: 0.05 mg/l

33. 2,4-Dichlorophenol: 0.9 mg/l

34. 2,4-Dichlorophenoxy acetic acid (2,4-D): 0.1 mg/l

35. Diclofop-methyl: 0.009 mg/l

36. Dimethoate: 0.02 mg/l

37. Dinoseb: 0.01 mg/l

38. Dioxin and Furan: 0.000000015  mg/l

39. Diquat: 0.07 mg/l

40. Diuron: 0.15 mg/l

41. Fluoride:  1.5 mg/l

42. Glyphosate:  0.28 mg/l

43. Heptachlor + Heptachlor Epoxide: 0.003 mg/l

44. Lead:  0.010 mg/l

45. Lindane (Total): 0.004 mg/l

46. Malathion: 0.19 mg/l

47. Mercury: 0.001 mg/l

48. Methoxychlor: 0.9 mg/l

49. Metolachlor: 0.05 mg/l

50. Metribuzin: 0.08 mg/l

51. Microcystin LR: 0.0015 mg/l

52. Monochlorobenzene: 0.08 mg/l

53. Nitrate (as nitrogen): 10.0 mg/l

54. Nitrite (as nitrogen): 1.0 mg/l

55. Nitrate + Nitrite (as nitrogen): 10.0 mg/l

56. Nitrilotriacetic Acid (NTA): 0.4 mg/l

57. N-Nitrosodimethylamine (NDMA):  0.000009 mg/l

58. Paraquat: 0.01 mg/l

59. Parathion: 0.05 mg/l

60. Pentachlorophenol: 0.06 mg/l

61. Phorate: 0.002 mg/l

62. Picloram: 0.19 mg/l

63. Polychlorinated Biphenyls (PCB):  0.003 mg/l

64. Prometryne:  0.001 mg/l

65. Selenium:  0.01 mg/l

66. Simazine: 0.01 mg/l

67. Temephos: 0.28 mg/l

68. Terbufos:  0.001 mg/l

69. Tetrachloroethylene (perchloroethylene):  0.03 mg/l

70. 2,3,4,6-Tetrachlorophenol: 0.1 mg/l

71. Triallate: 0.23 mg/l

72. Trichloroethylene: 0.005 mg/l

73. 2,4,6-Trichlorophenol: 0.005 mg/l

74. 2,4,5-Trichlorophenoxy acetic acid (2,4,5-T): 0.28 mg/l

75. Trifluralin: 0.045 mg/l

76. Trihalomethanes:  0.100 mg/l

77. Uranium: 0.02 mg/l

78. Vinyl Chloride:  0.002 mg/l

Radiological Parameters maximum allowable limit expressed as becquerels per liter

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

15. Americium-241   0.2

16. Antimony-122   50.0

17. Antimony-124   40.0

18. Antimony-125   100.0

19. Barium-140   40.0

20. Bromine-82   300.0

21. Calcium-45   200.0

22. Calcium-47   60.0

23. Carbon-14   200.0

24. Cerium-141   100.0

25. Cerium-144   20.0

26. Cesium-131   2000.0

27. Cesium-134   7.0

28.  Cesium-136   50.0

29. Cesium-137   10.0

30. Chromium-51   3000.0

31. Cobalt-57   40.0

32. Cobalt-58   20.0

33. Cobalt-60   2.0

34. Gallium-67   500.0

35. Gold-198   90.0

36. Indium-111   400.0

37. Iodine-125   10.0

38. Iodine-129   1.0

39. Iodine-131   6.0

40. Iron-55   300.0

41. Iron-59   40.0

42. Manganese-54   200.0

43. Mercury-197   400.0

44. Mercury-203   80.0

45. Molybdenum-99   70.0

46. Neptunium-239   100.0

47. Niobium-95   200.0

48. Phosphorus-32   50.0

49. Plutonium-238   0.3

50. Plutonium-239   0.2

51. Plutonium-240   0.2

52. Plutonium-241   10.0

53. Rhodium-105   300.0

54. Rubidium-81   3000.0

55. Rubidium-86   50.0

56. Ruthenium-103   100.0

57. Ruthenium-106   10.0

58. Selenium-75   70.0

59. Silver-108m   70.0

60. Silver-110m   50.0

61. Silver-111   70.0

62. Sodium-22   50.0

63. Strontium-85   300.0

64. Strontium-89   40.0

65. Strontium-90   5.0

66. Sulphur-35   500.0

67. Technetium-99   200.0

68. Technetium-99m   7000.0

69. Tellurium-129m   40.0

70. Tellurium-131m   40.0

71. Tellurium-132   40.0

72. Thallium-201   2000.0

73. Tritium   7000.0

74. Ytterbium-169   100.0

75. Yttrium-90   30.0

76. Yttrium-91   30.0

77. Zinc-65   40.0

78. Zirconium-95   100.0

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2 thoughts on “Water Quality Standards

  1. Hmm I had state water check of my well.. they reported e-coli and sent info on how to bleach well.. now I am wondering.. you say E-coli is not detectable.?? confused.. they check the lake water for it.. rivers.. and close beached for high ecoli.. explain why you say not detectable

    • Not detectable is not to say they cannot ever find ecoli. It means that when a test comes back with zero ecoli they say the ecoli was Not Detectable. Not detectable leaves the possibility of ecoli being present even though a test came back clean. Does that help clarify?

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