Public water system · HI0000204

Active

Kapalua

At a glance

Kapalua (PWSID HI0000204) is an active community water system in Maui County, Hawaii. It reports serving 4,200 people through 390 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 5 violations for this system; 2 are health-based, and the most recent began in December 2013.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

4,200

Service connections

390

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDHI0000204

System typeCommunity water system

Activity statusActive

Population served4,200

Service connections390

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyHI state drinking water program

City servedKapalua (Dho)

StateHawaii

ZIP—

CountyMaui County

How does Kapalua compare with other water systems in Maui County?

By EPA's size categories, Kapalua is a medium system (3,301 to 10,000 people). Maui County has 39 active public water systems, and Kapalua is the 6th-largest of them by population served. Its population served is roughly in line with the county average of 4,338 people per system, and accounts for 2.5% of the 169,182 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 Kapalua is about 37% below 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 112 Hawaii systems (82%) list groundwater as their primary source.

Who owns and regulates Kapalua?

EPA lists Kapalua as privately owned. 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. 22 of the 39 active systems in Maui County (56%) are also privately owned.

Does Kapalua have drinking water violations?

EPA's records list 5 violations for this system; 2 are health-based, and the most recent began in December 2013. The violations listed here began between September 1984 and December 2013. By type: 2 contaminant level above the legal limit, 2 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 4 as archived and 1 as resolved. 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. 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.

Began	Violation	Contaminant or rule	Health-based	Status
2013-12-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2000-01-01	Monitoring and reportingMonitoring, Regular · code 03	Gross alpha (excluding radon and uranium)code 4000	No	Archived
1995-06-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
1988-11-01	Public notice, recordkeeping or otherNotification, Public · code 06	Total coliform bacteria (pre-TCR)code 3000	No	Archived
1984-09-30	Public notice, recordkeeping or otherNotification, Public · code 06	Total coliform bacteria (pre-TCR)code 3000	No	Archived

All 5 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.

Kapalua: frequently asked questions

Who runs Kapalua?

Kapalua (PWSID HI0000204) is a community water system privately owned. It is regulated by the HI state drinking water program.

How many people does Kapalua serve?

Kapalua reports serving 4,200 people through 390 service connections in Maui County, Hawaii.

Where does Kapalua get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Kapalua have any drinking water violations?

EPA's records list 5 violations for this system; 2 are health-based, and the most recent began in December 2013. 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 Kapalua'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 5 violations for this system; 2 are health-based, and the most recent began in December 2013. For current results, consult the system's annual water quality report, EPA ECHO, or the HI state drinking water program.

Where can I find Kapalua's water quality report?

As a community water system, Kapalua 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 Maui County

Water system	County	Population served	Type	Source
Wailuku	Maui	74,511	Community	Surface water
Makawao	Maui	29,868	Community	Surface water
Lahaina	Maui	20,065	Community	Surface water
Kaanapali	Maui	8,000	Community	Groundwater
Upper Kula	Maui	7,686	Community	Surface water
Kaunakakai	Maui	3,702	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, “Kapalua, PWSID HI0000204, Hawaii”, https://aquacensus.com/water-systems/hawaii/kapalua-hi0000204 (data as of October 1, 2026).