F0/100
HILO — Water Quality Report 2026
Serving 39,477 people · Hawaii
Water Source
Groundwater
County
—
System ID
HI0000101
Violations
48
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
vanadium | 27.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2009.
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 HILO
Is HILO water safe to drink?
HILO water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 48 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has HILO detected?
66 contaminants were tested in HILO's water. Notable contaminants include vanadium. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does HILO have any EPA violations?
Yes, HILO has 48 EPA violation(s) on record, with the most recent in 2009. Violation types include TT. 48 are health-based violations.
How many people does HILO serve?
HILO serves approximately 39,477 people, Hawaii. The system provides water to 1 community: Hilo.
What type of water does HILO provide?
HILO sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is HI0000101.
How does HILO compare to other utilities in Hawaii?
HILO scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Hawaii state page for a full comparison of water systems.