Contrary to other assets, sanitary and storm sewers in Saskatchewan have been on a more or less steady and long-term ageing trend since the 1960s. Even though it fell slightly to 20.4 years in 2007, the average age of sewers in Saskatchewan was still among the three oldest among the provinces.
As a percentage of estimated useful life, Saskatchewan has consistently shown higher rates than the national average since the early 1970s. By 2007, sewer systems in the province had passed 61% of their estimated life, compared to the national average of 53%.