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Oregon Water Quality
277
Utilities in database
3.7M
Residents served
32%
On private wells
2
Key contaminants tracked
Drinking Water in Oregon
Oregon has 277 community water systems serving approximately 3.7 million residents. Primary water sources include surface water. The most commonly reported contaminants include disinfection byproducts, lead. 32% of Oregon residents rely on private wells. OHA holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Oregon
Top 20 of 277 by populationPortland Water Bureau
OR4100657 · 666,200 served
Tualatin Valley Water District
OR4100665 · 224,600 served
Salem Public Works
OR4100731 · 199,820 served
Eugene Water & Electric Board
OR4100287 · 176,000 served
Medford Water Commission
OR4100513 · 106,068 served
City of Hillsboro
OR4101513 · 92,632 served
City of Beaverton
OR4100081 · 88,045 served
City of Bend
OR4100100 · 77,704 served
City of Gresham
OR4100357 · 73,932 served
Rockwood Pud
OR4100668 · 65,443 served
City of Tigard
OR4100878 · 62,500 served
Springfield Utility Board
OR4100837 · 62,100 served
City of Corvallis
OR4100225 · 61,468 served
City of Albany
OR4100012 · 57,997 served
Sunrise Water Authority
OR4100635 · 50,003 served
Klamath Falls Water Dept
OR4100443 · 40,475 served
Lake Oswego Municipal Water
OR4100457 · 40,000 served
City of Keizer
OR4100744 · 38,585 served
Redmond Water Department
OR4100693 · 37,566 served
City of Grants Pass
OR4100342 · 37,138 served
Key Contaminant Concerns in Oregon
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
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Data source: Utility data from EPA SDWIS. 277 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-19