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ONTARIO WATERWORKS

Wisconsin — Community Water System — PWSID: WI6630259

System Information

PWSIDWI6630259
System NameONTARIO WATERWORKS
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region05
Serves SchoolNo
WholesalerNo
First ReportedJan 28, 1981
Last ReportedDec 17, 2025

Location & Contact

StateWisconsin
CityOntario
ZIP Code54651
Address205 STATE STREET
OrganizationONTARIO VILLAGE CLERK/TERRI TAYLOR
Phone—

Population & Service

Population Served554
Service Connections241

Drinking Water Violations (30)

This water system has 30 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
Jul 1, 2025 Jul 31, 2025 Revised Total Coliform Rule MON No No — — — Resolved Jul 31, 2025 Revised Total Coliform Rule
Oct 17, 2024 — Public Notice Other No No — — — Unaddressed — Public Notice Rule and Revised PN Rule
Apr 1, 2009 Jun 30, 2009 Chlorine MR No Yes — 4.0 mg/L — Resolved May 18, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2001 Oct 31, 2001 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 19, 2001 Total Coliform Rule
Oct 1, 2001 Oct 31, 2001 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 19, 2001 Total Coliform Rule
Oct 1, 2001 Oct 31, 2001 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 19, 2001 Total Coliform Rule
Oct 1, 2001 Oct 31, 2001 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 19, 2001 Total Coliform Rule
Oct 1, 2001 Oct 31, 2001 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 19, 2001 Total Coliform Rule
Jun 1, 1998 Jun 30, 1998 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 1998 Total Coliform Rule
May 1, 1995 May 31, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 26, 1995 Total Coliform Rule
Aug 1, 1994 Aug 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1994 Total Coliform Rule
Aug 1, 1994 Aug 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1994 Total Coliform Rule
Aug 1, 1994 Aug 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1994 Total Coliform Rule
Aug 1, 1994 Aug 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1994 Total Coliform Rule
Oct 1, 1993 Oct 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 1993 Total Coliform Rule
Oct 1, 1993 Oct 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 1993 Total Coliform Rule
Oct 1, 1993 Oct 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 1993 Total Coliform Rule
Oct 1, 1993 Oct 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 1993 Total Coliform Rule
Oct 1, 1993 Oct 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 1993 Total Coliform Rule
Oct 1, 1993 Oct 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 1993 Total Coliform Rule
Aug 1, 1993 Aug 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1993 Total Coliform Rule
Aug 1, 1993 Aug 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1993 Total Coliform Rule
Aug 1, 1993 Aug 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1993 Total Coliform Rule
Aug 1, 1993 Aug 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1993 Total Coliform Rule
Aug 1, 1993 Aug 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1993 Total Coliform Rule
May 1, 1993 May 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 31, 1993 Total Coliform Rule
May 1, 1993 May 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 31, 1993 Total Coliform Rule
May 1, 1993 May 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 31, 1993 Total Coliform Rule
May 1, 1993 May 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 31, 1993 Total Coliform Rule
May 1, 1993 May 31, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved May 31, 1993 Total Coliform 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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