This activity includes monitoring water quality and quantities in reservoirs, tanks and water mains. It is important that the water that reaches our customers' taps has adequate disinfectant residual. The average pH of water in Portland's distribution system is 7.4. In the distribution system, pH ranges from 7.1 to 8.0. Portland's water is very soft.
Water naturally varies in taste and odor at different times of the year.
Taste and odor problems can come from new or old pipelines, plumbing fixtures, or changes in water quality. Customers may notice changes during severe winter storms, when reservoirs are low, or during hot weather. The Water Bureau closely monitors such changes to ensure they do not affect the safety of the water. Rusting galvanized pipe in home plumbing systems is the usual cause of discolored water. If this is the case, the water clears after running a bit.