The average age of wastewater treatment facilities in British Columbia has risen from 13.4 years in 1998 to 17.2 years in 2007. This trend, which was still continuing, coincided with years of lower investments in recent years following several years of major inflows in the mid-1990s.
As a percentage of estimated useful life, British Columbia has trended below the national average since 1981. But both have increased considerably in the last 25 years. The British Columbia figure was 61% in 2007 compared with 63% nationally.