Table 7-3
Source water quality, annual medians of untreated surface water — Colour by drainage region

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Source water quality, annual medians of untreated surface water — Colour by drainage region
Table summary
This table displays the medians of annual minimum, average and maximum colour 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 colour values, the latter with subheaders of minimum, average and maximum and units of measure of true colour units (TCU). 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 332 raw surface water sources used to produce 3,068 million cubic metres of drinking water, serving 17.1 million people. Of the remaining surface source water sites, 146 respondents did not sample for colour, 321 did not respond for colour, and 30 reported partial data."
  Drainage region Median colour values
Minimum Average Maximum
  code true colour units (TCU)
Pacific Coastal 1 7 11 17
Fraser–Lower Mainland 2 5 5 5
Okanagan–Similkameen 3 5 6 7
Columbia 4 5 5 5
Yukon 5 .. .. ..
Peace–Athabasca 6 12 21 44
Lower Mackenzie 7 10 10 24
Arctic Coast–Islands 8 F F F
Missouri 9 F F F
North Saskatchewan 10 5 16 64
South Saskatchewan 11 3 12 33
Assiniboine–Red 12 23 31 46
Winnipeg 13 20 42 64
Lower Saskatchewan–Nelson 14 5 29 29
Churchill 15 F F F
Keewatin–Southern Baffin Island 16 .. .. ..
Northern Ontario 17 22 62 151
Northern Quebec 18 .. .. ..
Great Lakes 19 2 5 13
Ottawa 20 19 33 49
St. Lawrence 21 13 50 132
North Shore–Gaspé 22 F F F
Saint John–St. Croix 23 F F F
Maritime Coastal 24 12 23 28
Newfoundland–Labrador 25 26 29 30
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 332 raw surface water sources used to produce 3,068 million cubic metres of drinking water, serving 17.1 million people. Of the remaining surface source water sites, 146 respondents did not sample for colour, 321 did not respond for colour, and 30 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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