8.1 : Buildings Sector Water Consumption




8.1.4 Municipal Wastewater Treatment Facilities by Treatment Level and Population Served (Millions) (1)
Less than
Secondary Secondary Tertiary No Discharge Partial Treatment
Facilities Pop. Facilities Pop. Facilities Pop. Facilities Pop. Facilities Pop.
1996 176 17.2 9388 81.9 4428 82.9 2032 7.7 0 -
2000 47 6.4 9156 88.2 4892 100.9 1938 12.3 222 -
2004 40 3.3 9221 96.5 4916 108.5 2188 14.6 218 -
2008 30 3.8 7302 92.7 5071 112.9 2251 16.9 115 -
Note(s): 1) The level of treatment indicates the amount of processing involved before water is released from the treatment facility. Primary treatment removes solids and oils from wastewater. Secondary treatment uses biological processes to remove organic material from the water. Tertiary treatment includes additional processes to further refine the water. No Discharge refers to facilities that do not discharge effluent to surface waters (e.g. groundwater discharge). Partial Treatment facilities perform some treatment before transferring water to another facility for further treatment.









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