Public water system · HI0000400
ActiveLihue-Kapaa
At a glance
Lihue-Kapaa (PWSID HI0000400) is an active community water system in Kauai County, Hawaii. It reports serving 34,854 people through 11,482 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; none is health-based, and the most recent began in April 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
34,854
Service connections
11,482
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Lihue-Kapaa compare with other water systems in Kauai County?
By EPA's size categories, Lihue-Kapaa is a large system (10,001 to 100,000 people). Kauai County has 19 active public water systems, and Lihue-Kapaa is the largest of them by population served. Its population served is about 8.4 times the county average of 4,167 people per system, and accounts for 44% of the 79,166 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 Lihue-Kapaa is about 5.2 times 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 9 Hawaii systems (6.6%) list surface water as their primary source.
Who owns and regulates Lihue-Kapaa?
EPA lists Lihue-Kapaa as owned by a local 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. 9 of the 19 active systems in Kauai County (47%) are also owned by a local government.
Does Lihue-Kapaa have drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in April 2018. The violations listed here began between July 1992 and April 2018. By type: 9 monitoring and reporting. The contaminant or rule involved most often is Gross alpha (excluding radon and uranium) (3 of them). EPA lists 7 as resolved and 2 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 |
|---|---|---|---|---|
| 2018-04-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | Cryptosporidiumcode 3015 | No | Resolved |
| 2018-04-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | Turbiditycode 0100 | No | Resolved |
| 2018-04-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | E. colicode 3014 | No | Resolved |
| 2004-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Radium-226code 4020 | No | Resolved |
| 2004-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 2004-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Radium-228code 4030 | No | Resolved |
| 2000-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 2000-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 1992-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
All 9 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.
Lihue-Kapaa: frequently asked questions
Who runs Lihue-Kapaa?
Lihue-Kapaa (PWSID HI0000400) is a community water system owned by a local government. It is regulated by the HI state drinking water program.
How many people does Lihue-Kapaa serve?
Lihue-Kapaa reports serving 34,854 people through 11,482 service connections in Kauai County, Hawaii.
Where does Lihue-Kapaa get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Lihue-Kapaa have any drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in April 2018. 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 Lihue-Kapaa'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 9 violations for this system; none is health-based, and the most recent began in April 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the HI state drinking water program.
Where can I find Lihue-Kapaa's water quality report?
As a community water system, Lihue-Kapaa 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 Kauai County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Kalaheo-Koloa | Kauai | 12,660 | Community | Groundwater |
| Princeville | Kauai | 6,911 | Community | Groundwater |
| Kekaha-Waimea | Kauai | 5,998 | Community | Groundwater |
| Hanapepe-Eleele | Kauai | 5,592 | Community | Groundwater |
| Kilauea | Kauai | 3,420 | Community | Groundwater |
| Anahola | Kauai | 2,473 | 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, “Lihue-Kapaa, PWSID HI0000400, Hawaii”, https://aquacensus.com/water-systems/hawaii/lihue-kapaa-hi0000400 (data as of October 1, 2026).