C53/100
HNL-WINDWARD-PEARL HARBOR — Water Quality Report 2026
Serving 631,389 people · Hawaii
Water Source
Groundwater
County
—
System ID
HI0000331
Violations
43
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2013.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About HNL-WINDWARD-PEARL HARBOR
Is HNL-WINDWARD-PEARL HARBOR water safe to drink?
HNL-WINDWARD-PEARL HARBOR water receives a grade of C (53/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 43 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has HNL-WINDWARD-PEARL HARBOR detected?
73 contaminants were tested in HNL-WINDWARD-PEARL HARBOR's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does HNL-WINDWARD-PEARL HARBOR have any EPA violations?
Yes, HNL-WINDWARD-PEARL HARBOR has 43 EPA violation(s) on record, with the most recent in 2013. Violation types include MCL, MR. 1 are health-based violations.
How many people does HNL-WINDWARD-PEARL HARBOR serve?
HNL-WINDWARD-PEARL HARBOR serves approximately 631,389 people, Hawaii. The system provides water to 1 community: Honolulu-Windward-Pearlharbor.
What type of water does HNL-WINDWARD-PEARL HARBOR provide?
HNL-WINDWARD-PEARL HARBOR sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is HI0000331.
How does HNL-WINDWARD-PEARL HARBOR compare to other utilities in Hawaii?
HNL-WINDWARD-PEARL HARBOR scores 53/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Hawaii state page for a full comparison of water systems.