PlainWater
Counties → Hawaii

Honolulu County, Hawaii

Water Systems
40
Population Served
1,128,562
Total Violations
1,423
548 health-based
PFAS Detected
2
of 19 tested

Violation Analysis

82.5%
Systems with Violations
35.6
Avg Violations per System
38.5%
Health-Based Violations

Water Source Types

GW
38 systems (95%)
SW
2 systems (5%)

PFAS Contamination

19
Systems Tested
2
PFAS Detected
10.5%
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

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

No violations on record (7) One or more violations (33)

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
Hnl-Windward-Pearl Harbor 631,389 130 Detected
Waipahu-Ewa-Waianae 217,479 14 Detected
Joint Base Pearl Harbor-Hickam 65,230 34 Clean
Mililani 50,573 42 Clean
Schofield Barracks 37,920 23 Clean
Wahiawa 23,348 0 Clean
Marine Corps Base Hawaii 16,300 29 Clean
Waipio Heights 11,516 0 Clean
Waialua-Haleiwa 9,996 0 Clean
Fort Shafter 7,067 14 Clean
Nctams Eastpac 6,470 5 Clean
Aliamanu 6,406 21 Clean
Laie Water Company 5,577 32 Clean
Tripler Army Medical Cntr 5,555 24 Clean
Barbers Point 5,256 8 Clean
Waialee-Sunset Beach 4,916 0 Clean
Kamehameha Schools 4,000 4 Clean
Punahou School 4,000 43 Clean
The Queen's Medical Center 3,440 27 Clean
Sheraton Hotels 2,830 28 -
Kahuku 2,730 3 -
Dillingham Airfield 1,800 20 -
The Queen's Medical Center West Oahu 800 0 -
Kunia Village 650 86 -
Camp Stover 595 0 -
Waimano Ridge 545 27 -
Waiawa Correctional Facility 444 281 -
Hawaii Country Club 400 15 -
Waialua Sugar Pump 2 400 27 -
Waiahole 300 12 -
Navmag Lualualei 114 16 -
Mililani Memorial Park 100 278 -
Dillingham Ranch 100 15 -
Kahuku Air Base 75 18 -
Palehua Solar Observatory 50 24 -
Woodlands at Nuuanu 48 0 -
St Stephen's Diocesan Ctr 45 15 -
Kipapa Acres C.p.r. 43 82 -
Villa Rose 30 2 -
Poamoho 25 24 -

Other Counties in Hawaii

Maui County
39 systems · 169,182 served · 2,585 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 Honolulu County? ▼
Honolulu County has 1,423 total drinking water violations across 40 water systems, of which 548 are health-based violations. 82.5% of systems have at least one violation.
How many people get water from Honolulu County systems? ▼
Water systems in Honolulu County serve approximately 1,128,562 people through 40 public water systems.
Has PFAS been detected in Honolulu County water? ▼
Of 19 water systems tested for PFAS in Honolulu County, 2 had PFAS detected (10.5% detection rate).
What types of water sources supply Honolulu County? ▼
Water systems in Honolulu County use GW (38 systems), SW (2 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. 38.5% of Honolulu 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.