Water Quality Kitchen Faucet 

  • Where does my water come from?
  • Is my water hard or soft?
  • What chemicals are added to my water?
  • What do I do if my water is discolored?
  • Who is my water provider?

See the answers on our Frequently Asked Questions page.

Water Quality Reports

Each year, we publish information about the quality of our drinking water and other useful information about Gresham’s water system.
View the current report here:  

2016 Water Quality Report 

Lead in Drinking Water Program

Gresham’s water sources contain no detectable lead. Lead can enter drinking water primarily as a result of corrosion in household plumbing.  Because of this, some households have high lead levels, usually from corroded plumbing installed years ago.

Read more about ways to test and mitigate for lead in drinking water.

Backflow Prevention Program

Prevent Contamination of Drinking Water

Pressurized water pipes generally keep safe drinking water from the public system flowing to your property as intended. Backflow or back-siphonage occurs when water flows in the opposite direction. When this happens, used or contaminated water can flow back into the public drinking water system or a home or building. Backflow assemblies are devices that can keep this from happening.

The City has a state-mandated Backflow Prevention Program. Under the program, permitted backflow assemblies must be installed and then tested annually to ensure proper function. 

Read more about the backflow prevention program


For more information contact Department of Environmental Services at 503-618-2525.