B79/100
WAIKOLOA — Water Quality Report 2026
Serving 12,100 people · Hawaii
Water Source
Groundwater
County
—
System ID
HI0000135
Violations
6
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
vanadium | 71.00 µg/L | — | Above Goal |
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 WAIKOLOA
Is WAIKOLOA water safe to drink?
WAIKOLOA water receives a grade of B (79/100), which is considered good. Out of 66 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has WAIKOLOA detected?
66 contaminants were tested in WAIKOLOA's water. Notable contaminants include vanadium. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does WAIKOLOA have any EPA violations?
Yes, WAIKOLOA has 6 EPA violation(s) on record, with the most recent in 2010. Violation types include MR, MCL. 3 are health-based violations.
How many people does WAIKOLOA serve?
WAIKOLOA serves approximately 12,100 people, Hawaii. The system provides water to 1 community: Waikoloa (Dho).
What type of water does WAIKOLOA provide?
WAIKOLOA sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is HI0000135.
How does WAIKOLOA compare to other utilities in Hawaii?
WAIKOLOA scores 79/100 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.