Table 7-1
Source water quality, annual medians of untreated surface water — pH by drainage region

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Source water quality, annual medians of untreated surface water — pH by drainage region
Table summary
This table displays the medians of annual minimum, average and maximum pH 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 drainage region names. The column headers are comprised of the drainage region code and median pH values, the latter with subheaders of minimum, average and maximum and units of measure of pH units. This table has notes which read "Values were rounded to two decimal places. F denotes that there were too few respondents to calculate a reliable median. Data are from 416 raw surface water sources used to produce 3,988 million cubic metres of drinking water, serving 22.6 million people. Of the remaining surface source water sites, 78 respondents did not sample for pH, 296 did not respond for pH, and 39 reported partial data."
  Drainage region Median pH values
Minimum Average Maximum
  code pH units
Pacific Coastal 1 6.84 6.92 7.13
Fraser–Lower Mainland 2 7.35 7.45 7.73
Okanagan–Similkameen 3 7.12 7.65 8.09
Columbia 4 7.43 7.64 7.67
Yukon 5 .. .. ..
Peace–Athabasca 6 7.81 8.05 8.32
Lower Mackenzie 7 7.55 7.95 8.30
Arctic Coast–Islands 8 .. .. ..
Missouri 9 F F F
North Saskatchewan 10 7.40 7.97 8.50
South Saskatchewan 11 7.80 8.17 8.50
Assiniboine–Red 12 7.83 8.21 8.63
Winnipeg 13 6.70 7.16 7.60
Lower Saskatchewan–Nelson 14 7.79 8.04 8.21
Churchill 15 7.89 7.90 7.90
Keewatin–Southern Baffin Island 16 .. .. ..
Northern Ontario 17 6.77 7.49 8.11
Northern Quebec 18 .. .. ..
Great Lakes 19 7.33 8.01 8.34
Ottawa 20 6.58 7.30 7.80
St. Lawrence 21 6.86 7.50 8.10
North Shore–Gaspé 22 6.50 7.19 7.80
Saint John–St. Croix 23 F F F
Maritime Coastal 24 6.66 6.90 7.11
Newfoundland–Labrador 25 6.16 6.30 6.06
Note(s):
Values were rounded to two decimal places. F denotes that there were too few respondents to calculate a reliable median. Data are from 416 raw surface water sources used to produce 3,988 million cubic metres of drinking water, serving 22.6 million people. Of the remaining surface source water sites, 78 respondents did not sample for pH, 296 did not respond for pH, and 39 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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