Portland's Bull Run water is soft and its groundwater is moderately hard. Here is what each means for glass, tile and fixtures, and which supply reaches Beaverton, Lake Oswego, Tigard, Tualatin and Sherwood.
People who move to Portland from a hard water region often notice the same thing: the shower door stays clear and the kettle does not grow a white crust. That is the water. The Portland Water Bureau's main supply is soft, about half a grain of hardness per gallon, and most of the cleaning advice written for hard water cities does not apply here.
That does not mean there is nothing to clean. Soft water changes which residue builds up, and the picture shifts across the metro, because the suburbs draw from several different rivers and from wells. This guide sorts out who gets what and how to clean for it.
Portland's protected surface supply is the Bull Run Watershed in the Mount Hood National Forest, about 26 miles from the city, and the bureau describes it as supplying drinking water for nearly one million people. The bureau rates Bull Run water as soft, with a typical total hardness of 7 to 11 parts per million, or about half a grain per gallon. In its published test results, 100 percent Bull Run water shows a typical hardness of 7 mg/L.
The bureau also treats the water to protect pipes. It adds sodium carbonate and carbon dioxide to reduce corrosion, and the pH typically ranges between 8.0 and 9.0. Portland is also installing filtration to remove Cryptosporidium and other contaminants from Bull Run water, with a deadline of September 2029.
The bureau's second source is the Columbia South Shore Well Field, 25 active wells drawing from three aquifers. That groundwater is moderately hard, about 80 parts per million or about 5 grains per gallon, and the bureau's test results list 68 mg/L for 100 percent groundwater.
When your tap water includes groundwater, you may see faint white spots on glass and chrome that Bull Run water alone would not leave. They are light and wipe away easily compared with the scale common in truly hard water regions, but they are the reason a deep clean still treats shower glass for water spots.
Soft water lathers easily, so it is easy to use more soap, shampoo and detergent than needed. What builds up on a Portland shower door is mostly soap scum and body oil, not mineral crust. That residue is greasy rather than chalky, so it responds to a gentle degreasing cleaner and a soft, non-scratch pad.
Practical habits for soft water homes:
Some Portland addresses near the service boundary get water from other providers, including the City of Lake Oswego and the Tualatin Valley Water District. Beyond the city line, each suburb has its own source:
Because heavy scale is uncommon, a One-Time Deep Clean in Portland spends its bathroom effort on soap film, grout lines and fixtures rather than long soaks with acid. Faucets are detailed around the base and handles, and shower glass is treated for water spots where groundwater or a suburban supply has left them. Recurring visits keep that film from building up again.
The deep cleaning guide describes the full deep list, and the cost page shows prices by home size.
The questions Portland homeowners ask most often about this topic, answered plainly.
TotalCare Cleaning will service Portland and surrounding areas with background-checked cleaners and is insured up to $1 million. Re-clean guarantee: if we missed something, tell us by the end of the next day and we come back to fix it. Beyond Clean. TotalCare.
