Public water system · HI0000164
ActiveKawaihae Unit #1
At a glance
Kawaihae Unit #1 (PWSID HI0000164) is an active community water system in Hawaii County, Hawaii. It reports serving 193 people through 140 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a state government. EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2010.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
193
Service connections
140
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Kawaihae Unit #1 compare with other water systems in Hawaii County?
By EPA's size categories, Kawaihae Unit #1 is a very small system (500 people or fewer). Hawaii County has 39 active public water systems. Its population served is well below the county average of 3,693 people per system, and accounts for 0.1% of the 144,021 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 Kawaihae Unit #1 is well 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. 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 Kawaihae Unit #1?
EPA lists Kawaihae Unit #1 as owned by a state 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. 1 of the 39 active systems in Hawaii County (2.6%) are also owned by a state government.
Does Kawaihae Unit #1 have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2010. By type: 1 monitoring and reporting. The contaminant or rule involved is Total coliform bacteria (TCR). EPA lists 1 as resolved. 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 |
|---|---|---|---|---|
| 2010-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
The one violation in EPA's records.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.
Kawaihae Unit #1: frequently asked questions
Who runs Kawaihae Unit #1?
Kawaihae Unit #1 (PWSID HI0000164) is a community water system owned by a state government. It is regulated by the HI state drinking water program.
How many people does Kawaihae Unit #1 serve?
Kawaihae Unit #1 reports serving 193 people through 140 service connections in Hawaii County, Hawaii.
Where does Kawaihae Unit #1 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 Kawaihae Unit #1 have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2010. 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 Kawaihae Unit #1'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 one violation for this system; it is not health-based, and the most recent began in January 2010. For current results, consult the system's annual water quality report, EPA ECHO, or the HI state drinking water program.
Where can I find Kawaihae Unit #1's water quality report?
As a community water system, Kawaihae Unit #1 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 Hawaii County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Hilo | Hawaii | 39,477 | Community | Groundwater |
| North Kona | Hawaii | 29,581 | Community | Groundwater |
| Waikoloa | Hawaii | 12,100 | Community | Groundwater |
| South Kohala | Hawaii | 9,612 | Community | Surface water |
| South Kona | Hawaii | 6,512 | Community | Groundwater |
| Olaa-Mountain View | Hawaii | 6,467 | 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, “Kawaihae Unit #1, PWSID HI0000164, Hawaii”, https://aquacensus.com/water-systems/hawaii/kawaihae-unit-1-hi0000164 (data as of October 1, 2026).