Table 7-2
Source water quality, annual medians of untreated surface water — Total alkalinity by drainage region

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Source water quality, annual medians of untreated surface water — Total alkalinity by drainage region
Table summary
This table displays the medians of annual minimum, average and maximum total alkalinity values for raw surface water drawn for processing by drinking water plants, broken down by drainage region for 2011. The row headers are comprised of the Canada total and the 25 individual drainage region names. The column headers are comprised of the drainage region code and median total alkalinity values, the latter with subheaders of minimum, average and maximum and units of measure of milligrams per litre as calcium carbonate (CaCO3). This table has notes which read "Values were rounded to zero decimal places. F denotes that there were too few respondents to calculate a reliable median. Data are from 368 raw surface water sources used to produce 3,872 million cubic metres of drinking water, serving 21.9 million people. Of the remaining surface source water sites, 110 respondents did not sample for alkalinity, 320 did not respond for alkalinity, and 31 reported partial data."
  Drainage region Median total alkalinity values
Minimum Average Maximum
  code milligrams per litre as calcium carbonate (CaCO 3)
Pacific Coastal 1 9 10 14
Fraser–Lower Mainland 2 33 33 33
Okanagan–Similkameen 3 82 82 82
Columbia 4 36 36 36
Yukon 5 .. .. ..
Peace–Athabasca 6 109 141 160
Lower Mackenzie 7 86 89 89
Arctic Coast–Islands 8 F F F
Missouri 9 F F F
North Saskatchewan 10 119 134 152
South Saskatchewan 11 120 134 148
Assiniboine–Red 12 195 241 285
Winnipeg 13 15 17 19
Lower Saskatchewan–Nelson 14 85 99 116
Churchill 15 F F F
Keewatin–Southern Baffin Island 16 .. .. ..
Northern Ontario 17 25 65 80
Northern Quebec 18 .. .. ..
Great Lakes 19 82 92 96
Ottawa 20 16 27 41
St. Lawrence 21 25 48 70
North Shore–Gaspé 22 6 13 24
Saint John–St. Croix 23 F F F
Maritime Coastal 24 5 6 10
Newfoundland–Labrador 25 3 11 12
Note(s):
Values were rounded to zero decimal places. F denotes that there were too few respondents to calculate a reliable median. Data are from 368 raw surface water sources used to produce 3,872 million cubic metres of drinking water, serving 21.9 million people. Of the remaining surface source water sites, 110 respondents did not sample for alkalinity, 320 did not respond for alkalinity, and 31 reported partial data.
Source(s):
Statistics Canada, 2013, Environment Accounts and Statistics Division, Survey of Drinking Water Plants (survey number 5149).
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