HONOLULU, Hawaii Tap Water Quality

961,760 people served · 15 water systems

Excellent

HONOLULU, Hawaii is a large city with 961,760 residents served by a network of 15 public water systems. Water service covers ZIP codes 96813, 96817, 96826, 96843.

HONOLULU's drinking water utilities have maintained full EPA compliance over the most recent five-year reporting window — no health-based MCL exceedances have been recorded.

Last updated: 2026-05-18 · Source: EPA SDWIS

Location

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Centered on ZIP-code centroids of water systems serving this city.

ZIP Codes Served

96813 96817 96826 96843

Health-Based Violations (Last 5 Years)

EPA Maximum Contaminant Level exceedances reported by water systems serving HONOLULU. Each entry explains the contaminant, the health risk, and recommended precautions, and links to a full guide.

✅

No health-based violations in the last 5 years.

HONOLULU's water systems have met EPA health-based Maximum Contaminant Level (MCL) requirements throughout the EPA reporting window. This does not mean zero detection of regulated contaminants — it means all measured concentrations remained below their federal action levels.

Water Systems Serving HONOLULU

WOODLANDS AT NUUANU

PWSID: HI0000372

48 served

WAIAHOLE

PWSID: HI0000368

300 served

THE QUEEN'S MEDICAL CENTER

PWSID: HI0000312

3,440 served

DILLINGHAM AIRFIELD

PWSID: HI0000338

1,800 served

PUNALU'U

PWSID: HI0000114

200 served

HNL-WINDWARD-PEARL HARBOR

PWSID: HI0000331

631,389 served

WAIALUA-HALEIWA

PWSID: HI0000332

9,996 served

WAHIAWA

PWSID: HI0000333

23,348 served

WAIPIO HEIGHTS

PWSID: HI0000334

11,516 served

WAIPAHU-EWA-WAIANAE

PWSID: HI0000335

217,479 served

WAIALEE-SUNSET BEACH

PWSID: HI0000366

4,916 served

MILILANI

PWSID: HI0000367

50,573 served

KAHUKU

PWSID: HI0000365

2,730 served

KAMEHAMEHA SCHOOLS

PWSID: HI0000319

4,000 served

POAMOHO

PWSID: HI0000371

25 served

What Can You Do?

✅ Request your utility's annual Consumer Confidence Report (CCR) — required by law.
✅ Use an NSF-certified water filter if violations involve lead, arsenic, or PFAS.
✅ Run cold water for 30 seconds before drinking if you have older plumbing (reduces lead).
✅ Check back monthly — we update data from the EPA every 30 days.

About this data

This overview reflects EPA SDWIS data published as of 2026-05-18. It covers active Community Water Systems (CWS) that remained within federal Maximum Contaminant Levels during the past five-year EPA reporting window. For up-to-the-minute information, request a current Consumer Confidence Report from your utility, or review the EPA's public dashboard.

Frequently Asked Questions

Is HONOLULU, Hawaii tap water safe to drink?▼

This city's water had no EPA health-based violations in the last 5 years.

How many EPA violations does HONOLULU have?▼

HONOLULU has 0 EPA health-based water violations in the last 5 years across 15 water systems serving 961,760 people.

Should I use a water filter in HONOLULU?▼

Using an NSF-certified water filter is recommended if your area has violations involving lead, arsenic, or PFAS. For other contaminants, consult your local water utility. Check the annual Consumer Confidence Report (CCR) for detailed guidance.

What should I do if there are violations in HONOLULU?▼

Request your water utility's annual Consumer Confidence Report (CCR), which is required by the EPA. Follow the utility's guidance on boil water advisories. Run cold water for 30 seconds before drinking if you have older plumbing. Use an NSF-certified filter if needed based on your water system's violations.