Table 4
Groundwater volumes processed by drinking water plants, by drainage region

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Groundwater volumes processed by drinking water plants, by drainage region
  Drainage region code Raw water Treated water Backwash and wastewater 1
2005 2006 2007 2005 2006 2007 2005 2006 2007
  code millions of cubic metres
Canada 2 … 682.5 A 680.8 A 691.7 A 674.3 A 670.1 A 681.8 A 8.2 B 10.7 B 9.9 B
Pacific Coastal and Yukon 101,105 58.1 D 58.3 D 57.8 D 58.0 D 58.2 D 57.8 D 0.1 A 0.1 A 0.1 A
Fraser–Lower Mainland 102 62.0 D 68.4 D 68.5 D 61.7 D 68.1 D 68.1 D F F F
Okanagan–Similkameen 103 16.9 B 16.0 B 17.9 C 16.9 B 16.0 B 17.9 C 0.0 … 0.0 … 0.0 …
Columbia 104 17.6 A F F 17.6 A F F 0.0 … F F
Peace–Athabasca and Lower Mackenzie 206,207 9.0 A 9.9 A 9.5 A 8.8 A 9.6 A 9.2 A 0.2 A 0.3 A 0.3 B
Missouri 309 x 0.3 B 0.3 A x x x x x x
North Saskatchewan 410 9.3 B 9.7 B 9.7 B 7.9 B 8.7 B 8.3 B 1.4 E 1.1 E 1.5 E
South Saskatchewan 411 25.1 D 25.4 C 25.9 C 24.5 D 24.6 C 25.5 C 0.6 E F 0.4 E
Assiniboine–Red 412 22.8 B 23.9 B 23.6 B 21.7 B 22.5 B 22.1 B 1.1 E 1.3 D 1.5 D
Winnipeg, Lower Saskatchewan–Nelson, Churchill and Northern Ontario 413,414,415,417 13.1 B 14.1 B 12.6 B 12.5 B 12.4 B 12.0 B 0.6 D 1.7 E 0.6 D
Northern Quebec 418 9.4 A 13.6 A 14.5 A 9.4 A x x 0.1 A x x
Great Lakes 519 194.6 A 193.6 A 197.8 A 193.9 A 193.3 A 197.5 A 0.7 D F F
Ottawa 520 20.3 B 20.1 B 20.0 A 20.1 B 19.9 B 19.7 A 0.2 B 0.2 B 0.3 C
St. Lawrence 521 119.9 B 115.3 B 120.5 B 118.1 B 112.0 B 116.8 B 1.8 D 3.3 C 3.7 C
North Shore–Gaspé 522 33.8 B 32.1 B 31.8 B 33.6 B 31.9 B 31.6 B 0.2 E 0.2 E 0.2 E
Saint John–St. Croix 523 x 23.8 A 24.0 A x 23.5 A 23.7 A x 0.3 B 0.3 B
Maritime Coastal 524 32.9 B 31.9 A 33.4 B 32.3 B 31.2 A 32.8 B 0.7 E 0.8 D 0.6 D
Newfoundland–Labrador 525 12.8 C 12.7 B 12.7 B 12.8 C 12.7 B 12.7 B 0.0 … 0.0 A 0.0 …
1.
Calculated as the difference between raw water withdrawals and final volumes of treated water produced.
2.
Excludes Arctic Coast–Islands and Keewatin–Southern Baffin Island due to low response.
Note(s):
Includes groundwater under the direct influence of surface water. Figures may not add up to totals due to rounding.
Source(s):
Statistics Canada, 2009, Environment Accounts and Statistics Division, Survey of Drinking Water Plants (survey number 5149).