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Cyanotoxin Resources for Drinking Water

Rules for Cyanotoxin Monitoring in Drinking Water

Oregon Health Authority has developed temporary rules that will require drinking water systems in the state using certain surface water sources, such as those prone to harmful algae blooms, to routinely test for cyanotoxins that these blooms produce, and notify the public about the test results.

These rules are effective starting July 1, 2018 and will remain in effect until permanent rules can be established later this year following a thorough, public rulemaking process. 

In the meantime, OHA is encouraging water systems that serve surface water that has had algae issues in the past to voluntarily test for cyanotoxins and notify the public about the results.

Treatment Information

Other Resources

Maps of River Basins with Past Algae blooms and Drinking Water Intakes

For information regarding harmful algae blooms & recreational advisories, visit

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