Hawaii

Water quality data from the EPA Safe Drinking Water Information System

Lead Risk: Caution

Water Systems

237

Active public water systems

Population Served

1.52M

Residents with piped water

Lead Violations

Systems exceeding 15 ppb

Copper Violations

Lead & Copper Rule

Average Lead Level

1.21 ppb

EPA Action Level: 15 ppb

MCLG (health goal): 0 ppb

0 ppbAction Level: 15 ppb

Average across 151 systems with reported lead data.

Violations Detected

22 water systems in Hawaii have reported violations under the Lead and Copper Rule. These utilities are required to notify customers and take corrective action.

6 lead violations16 copper violations

Water Systems: Highest Lead Levels

System Name	City	Population	Lead Level	Status	Sample Date
HICKAM	HICKAM AFB	12,853	1.10 ppb	OK	2010-12-31
MAKAWAO	WAILUKU	29,868	0.88 ppb	OK	2019-12-31
LAHAINA	WAILUKU	20,065	0.78 ppb	OK	2018-12-31
HNL-WINDWARD-PEARL HARBOR	HONOLULU	631,389	0.00 ppb	OK	2018-12-31
WAIPAHU-EWA-WAIANAE	HONOLULU	217,479	0.00 ppb	OK	2018-12-31
WAILUKU	WAILUKU	74,511	0.00 ppb	OK	2018-12-31
JOINT BASE PEARL HARBOR-HICKAM	JBPPH	65,230	0.00 ppb	OK	2023-12-31
MILILANI	HONOLULU	50,573	0.00 ppb	OK	2018-12-31
HILO	HILO	39,477	0.00 ppb	OK	2022-12-31
SCHOFIELD BARRACKS	SCHOFIELD BARRACKS	37,920	0.00 ppb	OK	2022-12-31
LIHUE-KAPAA	LIHUE	34,854	0.00 ppb	OK	2021-12-31
NORTH KONA	HILO	29,581	0.00 ppb	OK	2021-12-31
WAHIAWA	HONOLULU	23,348	0.00 ppb	OK	2018-12-31
MARINE CORPS BASE HAWAII	KANEOHE BAY	16,300	0.00 ppb	OK	2021-12-31
KALAHEO-KOLOA	LIHUE	12,660	0.00 ppb	OK	2021-12-31

Showing top 15 of 148 systems with lead data. Action level: 15 ppb.

Water Source Types

Groundwater168 (72%)

Surface Water32 (14%)

Purchased Groundwater22 (9%)

Purchased Surface Water7 (3%)

Groundwater Under Influence of SW2 (1%)

Unknown2 (1%)

Resources

EPA Water Data Reports

Official drinking water data and reports

Lead in Drinking Water

EPA guidance on lead risks and remediation

Learn About Lead Contamination

Health effects, filtering options, and more

Air Quality

Good

Avg AQI

21.2

PM2.5

3.4 µg/m³

Unhealthy Days

Primary Pollutant

PM2.5

AQI 0 (Good)AQI 100 (Moderate)200+

Source: EPA AirNow & American Lung Association 2024 State of the Air. AQI scale: 0–50 Good · 51–100 Moderate · 101–150 Sensitive Groups · 151+ Unhealthy.

PFAS Contamination

Low Detection

PFAS (per- and polyfluoroalkyl substances), known as “forever chemicals,” are a group of synthetic chemicals that persist indefinitely in the environment and human body. The EPA set a maximum contaminant level (MCL) of 4 parts per trillion (ppt) for PFOA and PFOS in April 2024. View national PFAS tracker →

Systems Tested

PFAS Detected

Detection Rate

17.6%

Exceeding MCL (4 ppt)

0(0.0%)

0%Detection rate: 17.6%100%

Highest recorded level: 3 ppt (EPA MCL: 4 ppt). One of three states with no documented above-MCL PFAS detections in UCMR 5 data

Data source:EPA Safe Drinking Water Information System (SDWIS), Lead and Copper Rule monitoring data. Lead levels represent 90th percentile results from the most recent monitoring period. Violations indicate exceedances of EPA action levels requiring corrective action. This tool is for informational purposes only and does not replace your utility's official Consumer Confidence Report.