B70/100
WAILUKU — Water Quality Report 2026
Serving 74,511 people · Hawaii
Water Source
Surface Water
County
—
System ID
HI0000212
Violations
18
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2010.
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 WAILUKU
Is WAILUKU water safe to drink?
WAILUKU water receives a grade of B (70/100), which is considered good. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has WAILUKU detected?
69 contaminants were tested in WAILUKU's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does WAILUKU have any EPA violations?
Yes, WAILUKU has 18 EPA violation(s) on record, with the most recent in 2010. Violation types include MR, MCL, Other. 3 are health-based violations.
How many people does WAILUKU serve?
WAILUKU serves approximately 74,511 people, Hawaii. The system provides water to 1 community: Wailuku.
What type of water does WAILUKU provide?
WAILUKU sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is HI0000212.
How does WAILUKU compare to other utilities in Hawaii?
WAILUKU scores 70/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Hawaii state page for a full comparison of water systems.