A86/100
Waikoloa Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 25,356 residents · Hawaii
What's In Waikoloa's Tap Water?
66
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
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
Water Utility Details
WAIKOLOA
Population Served
12,100
Water Source
Groundwater
System ID
HI0000135
KAANAPALI
Population Served
8,000
Water Source
Groundwater
System ID
HI0000205
BARBERS POINT
Population Served
5,256
Water Source
Groundwater
System ID
HI0000355
Frequently Asked Questions About Waikoloa Water
Is Waikoloa tap water safe to drink?
Waikoloa, Hawaii tap water receives a grade of A (86/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Waikoloa's water?
Of the 69 contaminants tested in Waikoloa's water supply, the most notable include vanadium. No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Waikoloa have any water quality violations?
Yes, Waikoloa has 14 EPA violation(s) on record, with the most recent in 2010. Violation types include MR, MCL, Other. 6 of these are health-based violations, which are the most serious category.
Do I need a water filter in Waikoloa?
Waikoloa water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Waikoloa's tap water come from?
Waikoloa's drinking water is sourced from groundwater and supplied by WAIKOLOA and 2 other water system(s). The system serves approximately 25,356 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Waikoloa's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Waikoloa's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Waikoloa's water compare to other cities in Hawaii?
Waikoloa's water quality score of 86/100 earns a grade of A, which is considered excellent. This places Waikoloa among the better-performing water systems in Hawaii. Visit our Hawaii state page to see how all cities in the state compare.
What should I do if I'm concerned about Waikoloa's water quality?
If you have concerns about Waikoloa's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (WAIKOLOA) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.