According to Oregon Revised Statute (ORS) 448.271(1), when selling real estate that includes a domestic well, property owners are required to test the water for arsenic, nitrate, and total coliform bacteria. Domestic wells are those used for drinking and other household purposes. Test results must be reported within 90 days to the real estate buyer and Drinking Water Services after the seller receives the test results.
Collecting Water Samples
Samples must be collected (for current and future requirements above) according to Oregon Administrative Rule (OAR) 333-061-0335, and through OAR 333-061-0330 samples must be analyzed by an accredited laboratory. View the list of accredited laboratories for domestic well testing (pdf).
The Domestic Well Testing Reporting form (pdf) is required for all real estate transactions when there is a domestic well on the property. (Note: Springs DO NOT need to be tested under these regulations.) Use the Oregon Water Resources Department's Well Log Query to search for well information.
Residential water quality testing results can be accessed from the Pacific Northwest Water Quality Data Exchange. Information on how to retrieve data from the Exchange is provided in DEQ's Residential Well Owners - Water Quality Test Results fact sheet (pdf).
Who needs to comply, who can collect water samples, and other frequently asked questions
Visit the Domestic Well Testing & Real Estate Transaction FAQs page for answers to frequent questions about domestic well testing and real estate transactions.
More information about domestic well testing and contaminants commonly found in well water
Information on well maintenance, filtration options, and more