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EPA WATER QUALITY DATA · HI

Is Honolulu County Tap Water Safe in 2026?

Population-weighted grade and city-level UCMR5 risk bands for 1 WaterCheckup cities in Honolulu County. "At Risk" means at least one analyte above an EPA limit or a regulated PFAS violation for that system. "Safe" means no such flag and a low-concern city profile.

COUNTY GRADE
F
Score 27
1
Total cities
0
At Risk
0
Safe
350K
Population served
TOP CONTAMINANTS IN HONOLULU COUNTY (UCMR5)

Most common analytes with detections (>0) across cities in this county — each city counted once per compound.

1.PFPeA1 city
CITIES IN HONOLULU COUNTY
CITYGRADECONTAMINANTS ABOVE LIMITPOPULATION
HonoluluFMONITOR—350K
FILTER RECOMMENDATIONS

Typical picks for households in Honolulu County when UCMR5 shows PFAS or related analytes — same product lines we feature on city pages.

TOP PICKS FOR HONOLULU COUNTY
⚠ PFPeA and related contaminants in county UCMR data
#1
Waterdrop G3P800 RO
EDITORS PICK
Waterdrop  ·  ~$849
Tankless 800 GPD, removes 99%+ PFAS & lead, 10-stage filtration. Smart faucet TDS display.
WHY THIS FOR HONOLULU COUNTY · Chosen for Honolulu County because several cities are in a medium- or high-concern profile even without an EPA-limit flag in UCMR — RO still provides the broadest contaminant coverage for household drinking water.
#2
Aquasana SmartFlow RO
MOST CERTIFIED
Aquasana  ·  ~$449
WQA Gold Seal + NSF 42/53/58/401. Most certifications of any under-sink RO. Removes 90+ contaminants.
#3
AquaTru Under-Sink RO
EASIEST FILTER CHANGE
AquaTru  ·  ~$375
NSF 42/53/58 certified. Quick-change filters, no tools. Compact tankless design, 4-stage filtration.
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