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Drinking Water Rules
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Oregon Drinking Water Quality Act
Enacted in 1981, the statute (periodically amended) includes Oregon Revised Statute (ORS) 448.119 to 448.285; 454.235; and 454.255. The purpose of the above act is (in part) to:

  • Ensure that all Oregonians have safe drinking water;
  • Provide a simple and effective regulatory program for drinking water systems; and
  • Provide a means to improve inadequate drinking water systems.



Oregon Administrative Rules (OARs) for Public Water Systems
ORS 448.131 authorizes Drinking Water Services (DWS) to adopt administrative rules to ensure safe drinking water. OAR Chapter 333 Division 061 is reserved for regulations regarding public water systems and was last amended on September 10th, 2012. The rules in their entirety are available as PDF files below:
Specific portions of the rules are also available as PDF files below, ordered by section number (some of the files include more than one section of the rules):



OARs for Cross Connection and Backflow Prevention
The cross connection and backflow prevention rules serve to protect public water supplies from backflow hazards. They are provided below as PDF files.




OARs for Water System Operator Certification
The purpose of operator certification is to protect public health and public water systems in Oregon. DWS accomplishes this by reviewing the experience, education and credentials of persons responsible for the production, treatment and distribution of public drinking water and determining their compliance with an established standard of proficiency. The rules went into effect September 10, 2012, and include application guidelines, general operator criteria and grade requirements; operator system classifications and fees are also covered. They are provided below as PDF files; some of the files include more than one section of the rules, in which case the content is ordered by section number.




OARs for Domestic Well Testing for Real Estate Transactions
Amended in 2009, ORS 448.271 requires property owners, when selling Oregon real estate that includes a domestic well, 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 DWS after the seller receives the test results. Rules are downloadable as PDFs below. More information about domestic well testing for real estate transactions can be found here.