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HILO

Hawaii — Community Water System — PWSID: HI0000101

System Information

PWSIDHI0000101
System NameHILO
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedSep 10, 1979
Last ReportedDec 8, 2025

Location & Contact

StateHawaii
CityHILO
ZIP Code96720
AddressDEPARTMENT OF WATER SUPPLY
OrganizationOKAMOTO, KEITH K.
Phone808-961-8050

Population & Service

Population Served39,477
Service Connections14,621

Drinking Water Violations (118)

This water system has 118 violations recorded in the EPA SDWIS database.

Begin Date End Date Contaminant Category Health-Based Major Measured Federal MCL State MCL Status Return to Compliance Rule
Jan 1, 2009 Jan 31, 2009 Surface Water Treatment Rule TT Yes No — — — Resolved Jan 31, 2009 Surface Water Treatment Rule
Jan 1, 2009 Jan 31, 2009 Surface Water Treatment Rule TT Yes No — — — Resolved Jan 31, 2009 Surface Water Treatment Rule
Jan 1, 2009 Jan 31, 2009 Surface Water Treatment Rule TT Yes No — — — Resolved Jan 31, 2009 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Jan 1, 2000 — Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 2002 Surface Water Treatment Rule
Sep 1, 1999 Sep 30, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Sep 30, 1999 Surface Water Treatment Rule
Sep 1, 1999 Sep 30, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Sep 30, 1999 Surface Water Treatment Rule
Sep 1, 1999 Sep 30, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Sep 30, 1999 Surface Water Treatment Rule
Aug 1, 1999 Aug 31, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Aug 31, 1999 Surface Water Treatment Rule
Aug 1, 1999 Aug 31, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Aug 31, 1999 Surface Water Treatment Rule
Aug 1, 1999 Aug 31, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Aug 31, 1999 Surface Water Treatment Rule
Jul 1, 1999 Jul 31, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Jul 31, 1999 Surface Water Treatment Rule
Jul 1, 1999 Jul 31, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Jul 31, 1999 Surface Water Treatment Rule
May 1, 1999 May 31, 1999 Surface Water Treatment Rule TT Yes No — — — Archived May 31, 1999 Surface Water Treatment Rule
May 1, 1999 May 31, 1999 Surface Water Treatment Rule TT Yes No — — — Archived May 31, 1999 Surface Water Treatment Rule
May 1, 1999 May 31, 1999 Surface Water Treatment Rule TT Yes No — — — Archived May 31, 1999 Surface Water Treatment Rule
Apr 1, 1999 Apr 30, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Apr 30, 1999 Surface Water Treatment Rule
Apr 1, 1999 Apr 30, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Apr 30, 1999 Surface Water Treatment Rule
Mar 1, 1999 Mar 31, 1999 Surface Water Treatment Rule TT Yes No — — — Archived Mar 31, 1999 Surface Water Treatment Rule
Sep 1, 1998 Sep 30, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Sep 30, 1998 Surface Water Treatment Rule
Sep 1, 1998 Sep 30, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Sep 30, 1998 Surface Water Treatment Rule
Sep 1, 1998 Sep 30, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Sep 30, 1998 Surface Water Treatment Rule
Aug 1, 1998 Aug 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Aug 31, 1998 Surface Water Treatment Rule
Aug 1, 1998 Aug 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Aug 31, 1998 Surface Water Treatment Rule
Aug 1, 1998 Aug 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Aug 31, 1998 Surface Water Treatment Rule
Jul 1, 1998 Jul 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Jul 31, 1998 Surface Water Treatment Rule
Jul 1, 1998 Jul 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Jul 31, 1998 Surface Water Treatment Rule
Jul 1, 1998 Jul 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Jul 31, 1998 Surface Water Treatment Rule
Jun 1, 1998 Jun 30, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Jun 30, 1998 Surface Water Treatment Rule
Jun 1, 1998 Jun 30, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Jun 30, 1998 Surface Water Treatment Rule
Jun 1, 1998 Jun 30, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Jun 30, 1998 Surface Water Treatment Rule
May 1, 1998 May 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived May 31, 1998 Surface Water Treatment Rule
May 1, 1998 May 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived May 31, 1998 Surface Water Treatment Rule
May 1, 1998 May 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived May 31, 1998 Surface Water Treatment Rule
Apr 1, 1998 Apr 30, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Apr 30, 1998 Surface Water Treatment Rule
Apr 1, 1998 Apr 30, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Apr 30, 1998 Surface Water Treatment Rule
Apr 1, 1998 Apr 30, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Apr 30, 1998 Surface Water Treatment Rule
Mar 1, 1998 Mar 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Mar 31, 1998 Surface Water Treatment Rule
Mar 1, 1998 Mar 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Mar 31, 1998 Surface Water Treatment Rule
Mar 1, 1998 Mar 31, 1998 Surface Water Treatment Rule TT Yes No — — — Archived Mar 31, 1998 Surface Water Treatment Rule

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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