Is Oak Harbor, WA Tap Water Safe to Drink?
Oak Harbor, WA tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Contaminants including lithium have been detected at or below guideline thresholds.
Where Does Oak Harbor Get Its Water?
Water in Oak Harbor, WA is provided by 3 public water systems: OAK HARBOR CITY OF, ANACORTES CITY OF and KOHALA RANCH WATER CO..
How Is Oak Harbor Tap Water Treated?
Treated water is disinfected using free chlorine. Treatment includes conventional treatment (coagulation, flocculation, and filtration) and groundwater disinfection.
What's in Oak Harbor Tap Water?
The following contaminants were detected most frequently in Oak Harbor public water systems. All detected levels fall at or below EPA health guidelines in this dataset.
| Contaminant | Peak detected | EPA guideline | ZIPs detected | Status |
|---|---|---|---|---|
| lithium | 9 µg/L | — | 0 ZIPs | Within guideline |
| PFTrDA | 0.007 µg/L | — | 0 ZIPs | Within guideline |
| 11Cl-PF3OUdS | 0.005 µg/L | 0.005 µg/L | 1 ZIP | Within guideline |
| 11Cl-PF3OUdS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| HFPO-DA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
Health Risk Profile for Oak Harbor
Current EPA monitoring data for Oak Harbor shows contaminant levels within guideline thresholds across all ZIP codes in this dataset. As with all public water systems, sensitive populations may choose to use a certified filter for additional peace of mind.
Best Broad-Spectrum Filters for This Water Profile
This city profile includes PFAS detections, chlorine disinfection, and other dissolved contaminants. Reverse osmosis (RO) systems certified under NSF/ANSI 58 provide broad reduction coverage; for PFAS specifically, confirm NSF/ANSI P473 or equivalent PFAS reduction certification.
8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.
See recommendations matched to your exact address: choose your ZIP code below.
Frequently Asked Questions about Oak Harbor Tap Water
Is Oak Harbor tap water safe to drink?
Oak Harbor tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Sensitive populations may still choose to use a certified filter as a precaution.
What contaminants are in Oak Harbor tap water?
The most commonly detected contaminants in Oak Harbor water systems include: lithium, PFTrDA, 11Cl-PF3OUdS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Oak Harbor get its drinking water?
Oak Harbor receives water from 3 public water systems, including OAK HARBOR CITY OF.
Do I need a water filter in Oak Harbor?
Current data does not show guideline exceedances in Oak Harbor. A certified filter can still reduce trace contaminants and improve taste for households that prefer filtered water.
How often is Oak Harbor tap water tested?
Public water systems in Oak Harbor are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2025-05-05.
Tap water reports by ZIP in Oak Harbor
- 98277 - Oak Harbor tap water report Some concern
Water utilities serving Oak Harbor, WA
Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.
- NAVAL AIR STATION/WHIDBEY ISLANDSome concern
Also covers / overlaps with
- Central Whidbey Island CCD, WA · Township
- North Whidbey Island CCD, WA · Township
- Whidbey Island Station, WA · CDP