Public water system · HI0000356
ActiveMarine Corps Base Hawaii
At a glance
Marine Corps Base Hawaii (PWSID HI0000356) is an active community water system in Honolulu County, Hawaii. It reports serving 16,300 people through 2,555 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by the federal government. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
16,300
Service connections
2,555
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Marine Corps Base Hawaii compare with other water systems in Honolulu County?
By EPA's size categories, Marine Corps Base Hawaii is a large system (10,001 to 100,000 people). Honolulu County has 38 active public water systems. Its population served is about half of the county average of 29,687 people per system, and accounts for 1.4% of the 1,128,119 people reported by systems filed under the county. Across Hawaii, the 136 active systems average 11,181 people each. Nationally, the average active community water system reports serving 6,703 people, so Marine Corps Base Hawaii is about 143% above that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Hawaii has 119 active community water systems, 88% of the state's 136 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 14 Hawaii systems (10%) list purchased groundwater as their primary source.
Who owns and regulates Marine Corps Base Hawaii?
EPA lists Marine Corps Base Hawaii as owned by the federal government. The HI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 11 of the 38 active systems in Honolulu County (29%) are also owned by the federal government.
Does Marine Corps Base Hawaii have drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 2022. The violations listed here began between September 2006 and October 2022. By type: 4 monitoring and reporting, 1 public notice, recordkeeping or other and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 5 as resolved and 1 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2022-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2021-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2014-12-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2006-09-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 6 violations in EPA's records, newest first. Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Marine Corps Base Hawaii: frequently asked questions
Who runs Marine Corps Base Hawaii?
Marine Corps Base Hawaii (PWSID HI0000356) is a community water system owned by the federal government. It is regulated by the HI state drinking water program.
How many people does Marine Corps Base Hawaii serve?
Marine Corps Base Hawaii reports serving 16,300 people through 2,555 service connections in Honolulu County, Hawaii.
Where does Marine Corps Base Hawaii get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Marine Corps Base Hawaii have any drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 2022. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Marine Corps Base Hawaii's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in October 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the HI state drinking water program.
Where can I find Marine Corps Base Hawaii's water quality report?
As a community water system, Marine Corps Base Hawaii must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Honolulu County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Hnl-Windward-Pearl Harbor | Honolulu | 631,389 | Community | Groundwater |
| Waipahu-Ewa-Waianae | Honolulu | 217,479 | Community | Groundwater |
| Joint Base Pearl Harbor-Hickam | Honolulu | 65,230 | Community | Groundwater |
| Mililani | Honolulu | 50,573 | Community | Groundwater |
| Schofield Barracks | Honolulu | 37,920 | Community | Groundwater |
| Wahiawa | Honolulu | 23,348 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Marine Corps Base Hawaii, PWSID HI0000356, Hawaii”, https://aquacensus.com/water-systems/hawaii/marine-corps-base-hawaii-hi0000356 (data as of October 1, 2026).