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Community Water System · PWS HI0000237

Lanai City

Lanai City, Hawaii 96763 - drinking water served from groundwater sources to 3,200 people, tracked in EPA SDWIS and UCMR5.

3,200
People served
153
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 153 drinking-water violations at Lanai City, 2% of them health-based - above the Hawaii per-system average.

153
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
3,200
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lanai City

Lanai City is a private-owned community water system that delivers drinking water to 3,200 residents in Lanai City, Hawaii (Maui County) through 1,350 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 153 total violations for this system , of which 3 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 128 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is 1,2,4-Trichlorobenzene, recorded in 6 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Hawaii, EPA tracks 137 public water systems serving 1,520,931 people, with 5,234 cumulative violations and 2,289 health-based violations on record. About 80% of systems in the state carry at least one violation, and state-wide the average per system is 38.2 violations. Statewide, 2 of 45 UCMR5-tested systems have reported PFAS detections (4.4%).

Lanai City's 153 violations sit above the Hawaii average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
3,200
Total Violations
153
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
1,350
County
Maui
School/Daycare
No
MCL Violations
3
Monitoring Violations
128
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
1,2,4-Trichlorobenzene MR 6 2017
Xylenes, Total MR 6 2017
DICHLOROMETHANE MR 6 2017
Vinyl chloride MR 6 2017
1,1-Dichloroethylene MR 6 2017
trans-1,2-Dichloroethylene MR 6 2017
Carbon tetrachloride MR 6 2017
Tetrachloroethylene MR 6 2017
CHLOROBENZENE MR 6 2017
Benzene MR 6 2017
Toluene MR 6 2017
Ethylbenzene MR 6 2017
Styrene MR 6 2017
1,2-Dichloroethane MR 6 2017
1,1,1-Trichloroethane MR 6 2017
1,2-Dichloropropane MR 6 2017
1,1,2-Trichloroethane MR 6 2017
Trichloroethylene MR 6 2017
o-Dichlorobenzene MR 6 2017
p-Dichlorobenzene MR 6 2017
cis-1,2-Dichloroethylene MR 6 2017
Coliform (TCR) MCL 3 2005
Gross Alpha, Excl. Radon and U MR 1 2000
Lead and Copper Rule MR 1 2022

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Lanai City.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID HI0000237 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Hawaii Drinking Water Authority

Hawaii's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find HI regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2022 Lead and Copper Rule MR 1 SDWIS / HI0000237 / 5000
2017 1,2,4-Trichlorobenzene MR 6 SDWIS / HI0000237 / 2378
2017 Xylenes, Total MR 6 SDWIS / HI0000237 / 2955
2017 DICHLOROMETHANE MR 6 SDWIS / HI0000237 / 2964
2017 Vinyl chloride MR 6 SDWIS / HI0000237 / 2976
2017 1,1-Dichloroethylene MR 6 SDWIS / HI0000237 / 2977
2017 trans-1,2-Dichloroethylene MR 6 SDWIS / HI0000237 / 2979
2017 Carbon tetrachloride MR 6 SDWIS / HI0000237 / 2982
2017 Tetrachloroethylene MR 6 SDWIS / HI0000237 / 2987
2017 CHLOROBENZENE MR 6 SDWIS / HI0000237 / 2989
2017 Benzene MR 6 SDWIS / HI0000237 / 2990
2017 Toluene MR 6 SDWIS / HI0000237 / 2991
2017 Ethylbenzene MR 6 SDWIS / HI0000237 / 2992
2017 Styrene MR 6 SDWIS / HI0000237 / 2996
2017 1,2-Dichloroethane MR 6 SDWIS / HI0000237 / 2980

How Lanai City Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Lanai City Hawaii avg Federal benchmark
Total violations 153 38.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 16.7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 4.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 3,200 11,102 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 137 regulated public water systems in Hawaii.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Lanai City water safe to drink? ▼
Lanai City (PWS ID: HI0000237) has 153 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,200 people using Groundwater sources.
How many people does Lanai City serve? ▼
Lanai City serves 3,200 people in Lanai City, Hawaii. It is a Private-owned system using Groundwater water sources with 1,350 service connections.
What type of violations does Lanai City have? ▼
Lanai City has 153 total violations: 3 health-based violations (MCL exceedances or treatment failures), 128 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lanai City water? ▼
No PFAS testing data is available for Lanai City under the EPA's UCMR5 monitoring program.
What water source does Lanai City use? ▼
Lanai City uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.