Water Quality in 98277 — Oak Harbor, WA
EPA data for OAK HARBOR CITY OF
Data source: U.S. Environmental Protection Agency (EPA) SDWIS Last verified: March 16, 2026
Your Water System
ZIP code 98277 in Oak Harbor, Washington is served by OAK HARBOR CITY OF (EPA ID: WA5362650). This system provides water to approximately 23,767 people from surface water sources.
There are 21 community water systems serving this area.
Lead & Copper in Your Water
No Lead & Copper Rule sampling data available for systems serving this ZIP code.
Violation Summary
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| January 1, 2025 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| January 1, 2025 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| October 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| October 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| September 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| September 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| September 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| July 1, 2024 | Haloacetic Acids (HAA5) | Monitoring | Unresolved |
| July 1, 2024 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| July 1, 2024 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| July 1, 2024 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| July 1, 2024 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
| July 1, 2024 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
| July 1, 2024 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
| July 1, 2024 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
| July 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| July 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| July 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| July 1, 2024 | Surface Water Treatment Rule | Monitoring | Resolved |
| April 1, 2024 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for water systems serving this ZIP code:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 36 | Yes |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 19 | No |
| Lead | Inorganic | 15 | No |
| Consumer Confidence Report Rule | Reporting | 6 | No |
| Stage 1 DBP Rule | Treatment Technique | 3 | No |
| Surface Water Treatment Rule | Treatment Technique | 3 | No |
Need help with your water quality?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| OAK HARBOR CITY OF | WA5362650 | 23,767 | Surface water |
| ROLLING HILLS-GLENCAIRN | WA5374000 | 872 | Groundwater |
| NORTH WHIDBEY WATER DISTRICT | WA5361603 | 568 | Surface water |
| PENN COVE WATER AND SEWER DISTRICT | WA5366950 | 460 | Groundwater |
| DUGUALLA COMMUNITY INC | WA5320250 | 459 | Groundwater |
What You Can Do
- Request your water system’s Consumer Confidence Report (CCR) — Your utility is required to publish this annually
- Consider a home water test — Independent testing can reveal issues in your specific plumbing
- Install a certified water filter — NSF-certified filters can address specific contaminants
- Contact your water provider — Ask about current treatment and any ongoing remediation
Need help with water testing or filtration?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Other Water Quality Reports in Washington
- 98001 (Auburn) — 4 violations
- 98003 (Federal Way) — 5 violations
- 98004 (Bellevue)
- 98010 (Black Diamond)
- 98011 (Bothell) — 9 violations
- 98014 (Carnation) — 163 violations
- 98019 (Duvall) — 1 violation
- 98020 (Edmonds) — 1 violation
- 98022 (Enumclaw) — 1 violation
- 98024 (Fall City)
- 98027 (Issaquah) — 9 violations
- 98028 (Kenmore)
- 98030 (Kent) — 2 violations
- 98033 (Kirkland) — 3 violations
- 98036 (Lynnwood) — 6 violations
- 98038 (Maple Valley) — 7 violations
- 98052 (Redmond) — 2 violations
- 98055 (Renton) — 2 violations
- 98072 (Woodinville) — 6 violations
- 98074 (Sammamish) — 10 violations
Nearby Water Quality Reports
- 98273 (Mount Vernon) — 21 mi — 4 violations
- 98270 (Marysville) — 28 mi — 6 violations
- 98201 (Everett) — 30 mi — 19 violations
- 98225 (Bellingham) — 31 mi — 6 violations
- 98020 (Edmonds) — 37 mi — 1 violation
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for OAK HARBOR CITY OF (WA5362650) on EPA.gov.
Frequently Asked Questions
Is the tap water in 98277 safe to drink?
Oak Harbor’s water system has recorded 17 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
Where does 98277’s water come from?
The primary water source for this area is surface water. OAK HARBOR CITY OF serves approximately 23,767 people.
How can I get my water tested?
Contact your local water utility for a free water quality report, or hire a certified lab for independent home water testing. The EPA recommends testing annually if you use a private well.
Does 98277 have lead in the water?
No Lead and Copper Rule sampling data is currently available in EPA records for water systems serving ZIP code 98277. If you are concerned about lead, contact your water utility or have your tap water independently tested.
What is the radon risk in 98277?
Radon zone data is not available for ZIP code 98277. The EPA recommends testing all homes for radon regardless of location, as radon levels can vary significantly even within the same neighborhood.