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Ocean Shores pilots chemical change to remove orthophosphate tied to 'black slime' in homes
City of Ocean Shores · February 18, 2026
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Summary
Public works reported tests showing elevated orthophosphate in drinking water linked to household 'black slime'; a Univar polymer pilot removed about 90% of orthophosphate in jar tests but officials said Department of Health approval is required before broader implementation.
Public works director Ricky Victoriano said city water testing found elevated orthophosphate that staff believe is the primary cause of a black-slime buildup inside some homes when water is exposed to oxygen.
Ricky said the city piloted a Univar coagulant (referred to in the meeting…
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