Oregon Water Quality
According to EPA Safe Drinking Water Information System (SDWIS), Oregon has 943 active community water systems in this extract. PlainEnviro's health-based slice lists 2,683 violation records across 50 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.
Health-based violation records for 943 community water systems in Oregon. Source: EPA Safe Drinking Water Information System (SDWIS).
Water Systems with Most Health-Based Records
| # | Water System | Health-Based Records | Health |
|---|---|---|---|
| 1 | LONDON WATER CO-OP Cottage Grove | 139 | Yes |
| 2 | WEISS ESTATES WATER SYSTEM Bandon | 134 | Yes |
| 3 | MANZANITA HILLS SUBDIVISION Shady Cove | 111 | Yes |
| 4 | MONROE, CITY OF Harrisburg | 103 | Yes |
| 5 | SKYVIEW ACRES WATER COMPANY Sandy | 98 | Yes |
| 6 | VALE, CITY OF Vale | 82 | Yes |
| 7 | GALICE SUBDIVISION WATER CO Merlin | 79 | Yes |
| 8 | SWISSHOME VILLAGE Cottage Grove | 52 | Yes |
| 9 | CASCADE GORGE PROPERTIES Cave Junction | 52 | Yes |
| 10 | ADRIAN, CITY OF Adrian | 50 | Yes |
| 11 | SANDY, CITY OF Sandy | 44 | Yes |
| 12 | WARM SPRINGS WATER TREATMENT PLANT Warm Springs | 43 | Yes |
| 13 | SAGINAW PARK WATER SYSTEM Eugene | 43 | Yes |
| 14 | DEXTER OAKS CO-OP Dexter | 36 | Yes |
| 15 | SIMNASHO SCHOOLIE Warm Springs | 32 | Yes |
| 16 | GARDEN VALLEY WATER ASSOCIATION Coos Bay | 32 | Yes |
| 17 | LAWSON ACRES WATER ASSOCIATION Riddle | 32 | Yes |
| 18 | MILO ACADEMY Days Creek | 28 | Yes |
| 19 | MIDLAND WATER ASSOCIATION Clatskanie | 28 | Yes |
| 20 | CSWA CHEHALEM SPRINGS Newberg | 28 | Yes |
| 21 | NYSSA, CITY OF Nyssa | 27 | Yes |
| 22 | MAPLE ELSIE WATER SERVICE Seaside | 25 | Yes |
| 23 | RICHLAND, CITY OF Richland | 21 | Yes |
| 24 | CANYONVILLE, CITY OF Canyonville | 20 | Yes |
| 25 | TOOLEY WATER DISTRICT Newberg | 20 | Yes |
| 26 | DUNN COURT DUPLEXES Aloha | 20 | Yes |
| 27 | WHALESHEAD BEACH RESORT, LLC Brookings | 20 | Yes |
| 28 | PARADISE/ROGUE MEADOWS WS Clackamas | 18 | Yes |
| 29 | GLADSTONE, CITY OF Gladstone | 18 | Yes |
| 30 | SCOFIELD MOBILE HOME COURT Newport | 18 | Yes |
| 31 | YOUNG LIFE Antelope | 18 | Yes |
| 32 | UMPQUA RANCH COOP Idleyld | 17 | Yes |
| 33 | HAT ROCK WATER COMPANY Hermiston | 17 | Yes |
| 34 | MARSHLAND WATER ASSOCIATION Clatskanie | 15 | Yes |
| 35 | WATSECO-BARVIEW WATER DISTRICT Garibaldi | 14 | Yes |
| 36 | SHADY OAKS ESTATES Portland | 14 | Yes |
| 37 | COLTON WATER DISTRICT Colton | 13 | Yes |
| 38 | DRAIN, CITY OF Drain | 13 | Yes |
| 39 | REEDSPORT, CITY OF Reedsport | 13 | Yes |
| 40 | MONTGOMERY PLACE WATER SYSTEM Portland | 13 | Yes |
| 41 | ENCHANTED MOBILE HOME PARK Portland | 12 | Yes |
| 42 | BIG SPRUCE MHP LLC Eugene | 12 | Yes |
| 43 | APPLEWOOD MOBILE HOME PARK Eugene | 12 | Yes |
| 44 | INTERLACHEN WATER PUD Fairview | 12 | Yes |
| 45 | WESTERN HILLS MH ESTATES Rainier | 12 | Yes |
| 46 | YOUNGS RIVER LEWIS & CLARK WD Astoria | 11 | Yes |
| 47 | MAPLETON WATER DISTRICT Mapleton | 11 | Yes |
| 48 | OCEANSIDE WATER DISTRICT Oceanside | 11 | Yes |
| 49 | PAISLEY, CITY OF Paisley | 11 | Yes |
| 50 | LAKESIDE MOBILE HOME PARK Eugene | 11 | Yes |
Most Common Contaminants in Oregon
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Surface Water Treatment Rule | 470 | 67 |
| Arsenic | 466 | 20 |
| Lead and Copper Rule | 304 | 129 |
| Interim Enhanced Surface Water Treatment Rule | 271 | 22 |
| Total Haloacetic Acids (HAA5) | 251 | 18 |
| TTHM | 249 | 16 |
| Revised Total Coliform Rule | 241 | 111 |
| Groundwater Rule | 158 | 33 |
| LEAD AND COPPER RULE REVISIONS | 89 | 81 |
| Nitrate | 49 | 6 |
| Coliform (TCR) | 48 | 30 |
| Long Term 2 Enhanced Surface Water Treatment Rule | 43 | 5 |
| Gross Alpha, Excl. Radon and U | 13 | 1 |
| Di(2-ethylhexyl) phthalate | 12 | 1 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 12 | 6 |
Cities with Water Quality Issues
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About This Data
Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in Oregon are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.