Hawaii Tap Water Quality by City
EPA UCMR5 PFAS monitoring, MCL / guideline flags, and WaterCheckup grades for 1 cities in Hawaii. "At Risk" means at least one UCMR analyte flagged above an EPA limit or a regulated PFAS violation on record for that system. "Monitor" means no such flag in UCMR data, but the city profile is medium or high concern. "Safe" means no exceedance flags and a low-concern city profile (still not a guarantee for every tap).
Five most common UCMR analytes with detections (>0) in our tracked Hawaii cities — each city counted once per compound.
| CITY | GRADE | CONTAMINANTS ABOVE LIMIT | POPULATION |
|---|---|---|---|
| Honolulu Honolulu Board of Water Supply | FMONITOR | — | 350K |
County-level grades roll up every WaterCheckup city we map into the same county (via USPS city–county reference data).
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Hawaii water quality varies by city and water system. UCMR5 reports PFAS and related analytes; the "above limit" column uses the EPA-limit flags bundled with each analyte in our dataset (same basis as city pages). Here, no tracked city shows a compound flagged above its EPA limit in UCMR data; violations row still notes regulated tallies when present.
SDWIS/City reports: use each city link for full narrative, picks, and EPA Consumer Confidence Report context.
Enter your ZIP code for the full EPA-linked report for your water system — PFAS, violations, and filter recommendations.
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