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HI / Hilo

HI · Tap water records

Hilo tap water, in plain English

Here is what the EPA's own data shows about tap water in Hilo. According to EPA SDWIS data retrieved July 2026, Hilo is served by 24 active community water systems, together reported to serve about 118,171 people.

As of July 2026, EPA records show 11 violations across the community water system(s) serving Hilo, going back to the earliest EPA record. 4 of these are classified by the EPA as health-based (a contaminant recorded above the limit the EPA tracks); the rest are monitoring or reporting violations. Each is listed by system below, with its status.

24

Community water systems
~118,171

People served (EPA-reported)
July 2026

EPA records reviewed through

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What the EPA has on record, by system

Hilo

39,477 served · groundwater · PWSID HI0000101

Health-based Surface Water Treatment Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in January 2000. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.

North Kona

29,581 served · groundwater · PWSID HI0000131

Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in October 2022. EPA records do not show all of these as returned to compliance.

South Kohala

9,612 served · surface water · PWSID HI0000130

Monitoring Interim Enhanced Surface Water Treatment Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times in August 2024. All have since returned to compliance, per EPA records.

South Kona

6,512 served · groundwater · PWSID HI0000132

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Olaa-Mountain View

6,467 served · groundwater · PWSID HI0000112

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

North Kohala

4,933 served · groundwater · PWSID HI0000129

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Haina

4,563 served · groundwater · PWSID HI0000161

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Waiohinu-Naalehu

2,948 served · groundwater · PWSID HI0000108

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Papaikou

2,203 served · groundwater · PWSID HI0000107

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Lalamilo

1,895 served · groundwater · PWSID HI0000160

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Pahoa

1,885 served · groundwater · PWSID HI0000111

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Pepeekeo

1,450 served · groundwater · PWSID HI0000106

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Pahala

1,226 served · groundwater · PWSID HI0000109

Health-based Surface Water Treatment Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in July 2001. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.

Laupahoehoe-Kapehu

1,169 served · groundwater · PWSID HI0000102

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Hawaiian Ocean View Estates

1,000 served · groundwater · PWSID HI0000169

Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in September 2016. All have since returned to compliance, per EPA records.
Monitoring Chlorine: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 2016. All have since returned to compliance, per EPA records.

Paauilo

716 served · groundwater · PWSID HI0000134

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Honomu

645 served · groundwater · PWSID HI0000105

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Kukuihaele

483 served · groundwater · PWSID HI0000133

Health-based Surface Water Treatment Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in July 2005. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.

Hakalau-Wailea

402 served · groundwater · PWSID HI0000154

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Kalapana

275 served · groundwater · PWSID HI0000110

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Ookala (Dws)

264 served · groundwater · PWSID HI0000104

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Niulii

254 served · groundwater · PWSID HI0000139

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Ninole

151 served · groundwater · PWSID HI0000103

As of July 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Pepeekeo Water Association

60 served · groundwater · PWSID HI0000167

Health-based Lead and Copper Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in January 2010. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.

What this means

A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.

This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.

Source: U.S. EPA Envirofacts SDWIS, retrieved July 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.