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Mililani Mauka, HI Tap Water Quality 2026

Water quality report for Mililani Mauka, HI — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Mililani Mauka's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Mililani PWSID: HI0000367 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. No PFAS was detected.

B

Mililani Mauka earns a B for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: not detected
PFAS tested, none detected
No violations since 2015
No violations currently open
Mililani Mauka's lead level vs. all Hawaii community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Hawaii utilities
Population Served
16721
~11915 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
None on record since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

✓ No violations on record for this water system.
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

No violations are on record for this system since 2015. EPA records violations for every community water system, so this reflects a clean compliance history rather than missing data.

About the Main Water System

Utility Mililani
PWSID HI0000367
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 16,721
Service connections 11,915
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Mililani Mauka tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Mililani Mauka water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Mililani Mauka? ▼
Mililani (PWSID HI0000367). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2022-07-21. Inspectors recorded 5 significant deficiencies.

What Should Mililani Mauka Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

Nearby Cities in Hawaii

Urban Honolulu, Hi Tap Water Quality 2026 Honolulu East Honolulu, Hi Tap Water Quality 2026 Honolulu Pearl City, Hi Tap Water Quality 2026 Honolulu Waipahu, Hi Tap Water Quality 2026 Honolulu Kailua, Hi Tap Water Quality 2026 Honolulu Kaneohe, Hi Tap Water Quality 2026 Honolulu