Water supply systems have shown a slight trend towards ageing in the province since 1993, when the average age was at an all time low of 11.7 years. This ageing trend has continued in recent years even though the value of the gross stock kept rising. In 2007, the average age of water supply systems in the province stood at 14.3 years. Water supply systems accounted for 12% of Newfoundland and Labrador's infrastructure.
As a percentage of estimated useful life, this infrastructure was historically older than the national average up until the 1980s. Since then the ratio has been consistently below or close to the national average standing at 39% in 2007.