PlainWater
Counties → Hawaii

Maui County, Hawaii

Water Systems
39
Population Served
169,182
Total Violations
2,585
1,101 health-based
PFAS Detected
0
of 9 tested

Violation Analysis

76.9%
Systems with Violations
66.3
Avg Violations per System
42.6%
Health-Based Violations

Water Source Types

GW
33 systems (85%)
SW
6 systems (15%)

PFAS Contamination

9
Systems Tested
0
PFAS Detected
0.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Maui Hawaii water systems by violation status, EPA SDWIS records.

No violations on record (9) One or more violations (30)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Wailuku 74,511 59 Clean
Makawao 29,868 304 Clean
Lahaina 20,065 243 Clean
Kaanapali 8,000 18 Clean
Upper Kula 7,686 256 Clean
Kapalua 4,200 30 Clean
Kaunakakai 3,702 76 Clean
Lower Kula 3,522 145 Clean
Lanai City 3,200 153 -
Hoolehua 2,400 46 -
Kipahulu 2,000 3 -
Hana 1,284 139 -
Haleakala National Park 1,200 14 -
Ualapue 1,119 60 -
Maunaloa-Kaluakoi 1,000 140 -
Hoku'ula Water System 1,000 0 -
Hana Water Systems - South 816 31 -
Mahanalua Nui Subdivison 606 0 -
Kawela Plantation 553 1 -
Kualapuu 500 100 -
Kalae 360 16 -
Keanae 270 43 Clean
Hana Water Systems - North 160 12 -
Kahakuloa Water Co. 150 3 -
Kalaupapa Nhp 110 59 -
Nahiku 107 65 -
Olowalu 100 155 -
Maunaolu Plantation 100 0 -
Kailua 90 88 -
Consolidated Baseyards 90 24 -
Kipu 80 11 -
Kula Nani 80 0 -
Maui Business Park Phase II 63 0 -
West Kuiaha Meadows 60 0 -
Honokohau 42 285 -
Baldwin Ranch Estates 32 0 -
Maui Highlands 26 0 -
Haiku Town Water Association, Inc. 20 6 -
Pulehunui Water Association 10 0 -

Other Counties in Hawaii

Honolulu County
40 systems · 1,128,562 served · 1,423 violations
Hawaii County
39 systems · 144,021 served · 811 violations
Kauai County
19 systems · 79,166 served · 415 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Maui County? ▼
Maui County has 2,585 total drinking water violations across 39 water systems, of which 1,101 are health-based violations. 76.9% of systems have at least one violation.
How many people get water from Maui County systems? ▼
Water systems in Maui County serve approximately 169,182 people through 39 public water systems.
Has PFAS been detected in Maui County water? ▼
Of 9 water systems tested for PFAS in Maui County, 0 had PFAS detected (0.0% detection rate).
What types of water sources supply Maui County? ▼
Water systems in Maui County use GW (33 systems), SW (6 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 42.6% of Maui County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

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 page draws directly on 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.