Is HILO required to publish a Consumer Confidence Report?

Yes. HILO is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is HILO’s next Consumer Confidence Report due?

HILO’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

HILO, HI · Hawaii County

HILO Water System

Consumer Confidence Report status

HILO must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for HILO.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Hawaii’s official records. Always confirm current status with Hawaii before making decisions based on this information.

System facts

System ID (PWSID): HI0000101
System type: Community Water System
Population served: 39,477
Service connections: 14,621
Ownership: local government
Water source: groundwater (wells)

HILO is among the 7 largest community water systems in Hawaii, serving 39,477 people from groundwater.

As of August 1, 2026, its federal record holds 7 entries between 1995 and 1998, all of which EPA lists as closed. Nothing has been added since 1998.

None of the 7 are monitoring or reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset; these involve water-quality, treatment, or public-notice findings instead. The record involves the Surface Water Treatment Rules.

Violation history

Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
July 1, 1998 – July 31, 1998
Archived
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
June 1, 1998 – June 30, 1998
Archived
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
April 1, 1998 – April 30, 1998
Archived
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
October 1, 1997 – October 31, 1997
Archived
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
August 1, 1997 – August 31, 1997
Archived
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
July 1, 1996 – July 31, 1996
Archived
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
December 1, 1995 – December 31, 1995
Archived

Archived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
July 1, 1998 – July 31, 1998	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Archived
June 1, 1998 – June 30, 1998	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Archived
April 1, 1998 – April 30, 1998	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Archived
October 1, 1997 – October 31, 1997	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Archived
August 1, 1997 – August 31, 1997	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Archived
July 1, 1996 – July 31, 1996	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Archived
December 1, 1995 – December 31, 1995	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Archived

Archived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

October 17, 1997State Public Notification requested418 linked violations

Common questions

Is HILO required to publish a Consumer Confidence Report?: Yes. HILO is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is HILO’s next Consumer Confidence Report due?: HILO’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does HILO have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for HILO.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

OKAMOTO, KEITH K.

808-961-8050

HILO, HI 96720