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WaterSafeCheck

Oak Harbor, WA Tap Water Quality

Water safety reports for all 2 ZIP codes in Oak Harbor, Washington

Average Score

69/100

Health Violations

12

ZIP Codes

2

High Lead Risk

0

of 2 ZIP codes

C

About Tap Water in Oak Harbor, WA

Water quality in Oak Harbor, WA is currently rated with a moderate C grade (average score: 69/100 across 2 ZIP codes). This rating indicates that while the water provided by City of Oak Harbor is treated and regulated, there have been notable compliance issues or contaminant detections recently. Residents should stay informed about the specific challenges affecting their local supply.

The accumulation of 12 health-based violations over the past 5 years highlights systemic challenges within Oak Harbor's water infrastructure. When violations occur, it means that drinking water tests revealed contaminant levels exceeding safe limits, triggering mandatory corrective actions by Washington State Department of Health. The city relies on surface water, which may require significant treatment upgrades to address these recurring issues.

Fortunately, the modeled risk for widespread lead exposure in Oak Harbor's municipal water is relatively low compared to national averages. However, because lead typically enters drinking water through the corrosion of older, individual home plumbing rather than the main supply lines, residents in homes built before 1986 should still exercise caution by running the tap before use.

Health-Based Contaminant Violations in Oak Harbor

EPA records indicate that the following contaminants have exceeded Safe Drinking Water Act Maximum Contaminant Levels (MCLs) in Oak Harbor water systems over the past 5 years.

Haloacetic Acids (HAA5)

Note: The presence of a past violation does not necessarily mean current water is unsafe. Utilities are required to take corrective action. Review your Consumer Confidence Report for the latest status.

Water Quality by ZIP Code — Oak Harbor, WA

Click any ZIP code for the full water quality report

B
98278

Oak Harbor, WA

Score: 71/1006 violations
C
98277

Oak Harbor, WA

Score: 66/1006 violations

Frequently Asked Questions — Oak Harbor Water Quality

Is tap water safe to drink in Oak Harbor, WA?+
Tap water in Oak Harbor has a grade of C, indicating compliance concerns in recent years. Families with young children or pregnant women should consider using a certified NSF/ANSI 53 water filter for drinking and cooking.
What is the water quality score for Oak Harbor?+
The average water quality score across 2 ZIP codes in Oak Harbor, WA is 69/100. Scores are derived from EPA violation history, lead levels, enforcement actions, and infrastructure risk indicators. Individual ZIP codes may vary — search your specific ZIP above for a personalized report.
Does Oak Harbor have lead in its tap water?+
Lead risk ratings in Oak Harbor are relatively low based on EPA monitoring data. However, lead in home plumbing is a separate concern — if your home was built before 1986, individual tap testing is recommended.
How do I get the water quality report for Oak Harbor?+
Each ZIP code in Oak Harbor has a full water quality report on this site — click any ZIP code below. You can also get the annual Consumer Confidence Report (CCR) from your local water utility. The CCR is required to be published every year by July 1 and contains actual contaminant measurements and violation history.
Where does Oak Harbor's tap water come from?+
Tap water in Oak Harbor, WA primarily comes from surface water. Surface water systems treat water from rivers, lakes, or reservoirs using filtration, sedimentation, and disinfection before it reaches your tap.

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