Oak Harbor Water Quality
Washington
According to EPA SDWIS, Oak Harbor, Washington is served by 26 community water systems covering about 27,578 people. The same extract lists 91 health-based violation records, most recently coded 2950 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Oak Harbor, Washington is delivered through 26 EPA-regulated community water systems serving an estimated 27,578 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 91 violation records across the 26 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 2 distinct EPA contaminant codes: TTHM, Arsenic. 2 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Washington drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| OAK HARBOR CITY OF | 23,675 | 0 | Clean |
| ROLLING HILLS-GLENCAIRN | 872 | 19 | Health |
| NORTH WHIDBEY WATER DISTRICT | 568 | 0 | Clean |
| PENN COVE WATER AND SEWER DISTRICT | 460 | 32 | Health |
| DUGUALLA COMMUNITY INC | 459 | 0 | Clean |
| BAYVIEW ESTATES WATER COMPANY | 227 | 0 | Clean |
| SUNRISE HILLS COMMUNITY W S | 186 | 0 | Clean |
| BON AIR COMMUNITY CLUB INC. | 160 | 0 | Clean |
| WATERLOO ACRES COMMUNITY WATER SYS | 125 | 0 | Clean |
| CAMPO HACIENDA | 123 | 6 | Health |
| PATTONS RETREAT WATER ASSN | 90 | 0 | Clean |
| SCENIC HEIGHTS W A INC | 78 | 0 | Clean |
| HIGHLAND TRACE WATER CO INC | 62 | 0 | Clean |
| FOREST HILLS PARK COMMUNITY | 54 | 0 | Clean |
| BONNIE VIEW WATER | 50 | 34 | Health |
| LYON RD COMMUNITY ASSOCIATION | 50 | 0 | Clean |
| SUBURBAN HILLS COMMUNITY ASSOC | 46 | 0 | Clean |
| WESTVIEW COMMUNITY ASSOCIATION | 43 | 0 | Clean |
| EVERGREEN VALLEY VIEW WATER SYSTEM | 40 | 0 | Clean |
| SAN JUAN ESTATES WATER ASSOCIATION | 36 | 0 | Clean |
| BAYVIEW MEADOWS WATER SYSTEM | 34 | 0 | Clean |
| LITTLE VALLEY APTS. | 30 | 0 | Clean |
| Koontz Ranch Water System | 30 | 0 | Clean |
| FARANDA WATER ASSOCIATON | 28 | 0 | Clean |
| TIMARU COMMUNITY WATER ASSOCIATION | 27 | 0 | Clean |
| FROSTAD FARMS WATER ASSN | 25 | 0 | Clean |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| ROLLING HILLS-GLENCAIRN | TTHM | 2025-10-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2025-10-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2025-07-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2025-04-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2025-01-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2025-01-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2025-01-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-10-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-10-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-10-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2024-10-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2024-10-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-07-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-07-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-07-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2024-07-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2024-07-01 |
| CAMPO HACIENDA | Arsenic | 2024-07-01 |
| CAMPO HACIENDA | Arsenic | 2024-07-01 |
| CAMPO HACIENDA | Arsenic | 2024-07-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-04-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-04-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2024-04-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2024-04-01 |
| CAMPO HACIENDA | Arsenic | 2024-04-01 |
| CAMPO HACIENDA | Arsenic | 2024-04-01 |
| CAMPO HACIENDA | Arsenic | 2024-04-01 |
| BONNIE VIEW WATER | Arsenic | 2024-04-01 |
| BONNIE VIEW WATER | Arsenic | 2024-04-01 |
| BONNIE VIEW WATER | Arsenic | 2024-04-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-01-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-01-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-01-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2024-01-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2024-01-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2024-01-01 |
| BONNIE VIEW WATER | Arsenic | 2024-01-01 |
| BONNIE VIEW WATER | Arsenic | 2024-01-01 |
| BONNIE VIEW WATER | Arsenic | 2024-01-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2023-10-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2023-10-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2023-10-01 |
| ROLLING HILLS-GLENCAIRN | TTHM | 2023-10-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2023-10-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2023-10-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2023-10-01 |
| BONNIE VIEW WATER | Arsenic | 2023-10-01 |
| BONNIE VIEW WATER | Arsenic | 2023-10-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2023-07-01 |
| PENN COVE WATER AND SEWER DISTRICT | TTHM | 2023-07-01 |
What are Oak Harbor's health-based records for?
Oak Harbor's health-based violation records carry 2 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
TRI Facilities in Oak Harbor
| Facility | Total Releases |
|---|---|
| US Navy Nas Whidbey Island Ault Field | 77.3K lbs |
| Technical Services Inc | 0 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Oak Harbor, Washington? ▼
How many water violations does Oak Harbor have in this EPA extract? ▼
What contaminants were found in Oak Harbor water? ▼
How many water systems serve Oak Harbor? ▼
Where does Oak Harbor get its drinking water? ▼
Are there pollution sources near Oak Harbor? ▼
How does Oak Harbor compare in Washington?
Of the 365 Washington places with at least one community water system on file, Oak Harbor ranks #20 by number of systems (26).
Either side of it: Union (27), Napavine (26), Olympia (25), Pasco (23)
About This Data
Figures here are the current EPA SDWIS extract joined to the 26 community water systems whose service area lists Oak Harbor, ranked against the 365 Washington places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.