Domestic Well Testing FAQ

What is domestic well testing?

Domestic well testing is the process of having a laboratory test water from an individual private well for both nitrate and coliform bacteria before the house served by that well is sold.

Are there legal responsibilities?

Yes. There is an Oregon law, ORS 448.271, which requires testing of domestic well water for real estate transaction. Effective since July 24, 1989, this law states in part:

"(1) In any transaction for the sale or exchange of real estate that includes a well that supplies groundwater for domestic purposes, the seller of the real estate shall, upon accepting an offer to purchase that real estate, have the well tested for nitrate and total coliform bacteria. The Health Services also may require additional tests for specific contaminants in an area of groundwater concern or groundwater management area. The seller shall submit the results of the test required under this section to the Health Services."

Oregon Administrative Rule 333-61-305 to 333-61-335 (pdf 20K) further defines the actions the seller must take.

Who needs to comply?

The seller of the real estate is responsible. However, the seller may designate their attorney, real estate agent or broker, the laboratory person conducting the water testing, or a private party to assist them in complying with water testing and reporting requirements.

What data must the seller report to the Health Services?

The seller must report specific information about the well. To assure all necessary information is provided, the seller should complete a Domestic Well Testing For Real Estate Transaction form. Blank forms are available from real estate offices or the Oregon Health Services Drinking Water Program.

What if the well water does not meet safe standards?

Technical assistance is available. Contact your County Health Department or the Oregon Department of Human Services Drinking Water Program at (971) 673-0405.

Where does the seller send the completed form?

Mail completed forms to: