Public Water Partners

Oak Creek, WI · Milwaukee County

OAK CREEK WATERWORKS Water System

Consumer Confidence Report status

OAK CREEK WATERWORKS 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 OAK CREEK WATERWORKS.

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 Wisconsin’s official records. Always confirm current status with Wisconsin before making decisions based on this information.

System facts

System ID (PWSID)
WI2410172
System type
Community Water System
Population served
32,104
Service connections
11,890
Ownership
local government
Water source
surface water (rivers, lakes, or reservoirs)

OAK CREEK WATERWORKS is among the 21 largest community water systems in Wisconsin, serving 32,104 people from surface water.

As of August 1, 2026, its federal record holds 8 entries between 1991 and 2021, all of which EPA lists as closed. Nothing has been added since 2021.

Of the 8, 7 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves synthetic organic chemicals, the Stage 2 Disinfectants and Disinfection Byproducts Rule, and the Total Coliform Rules.

Violation history

  • Monitoring and Reporting (DBP)

    —

    Total Haloacetic Acids (HAA5)

    January 1, 2021 – March 31, 2021

    Resolved

  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2018 – September 30, 2018

    Resolved

  • Monitoring and Reporting (DBP)

    —

    TTHM

    October 1, 2013 – December 31, 2013

    Resolved

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2002 – September 30, 2002

    Resolved

  • Monitoring, Regular

    —

    Endothall

    January 1, 2002 – September 30, 2002

    Resolved

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2002 – September 30, 2002

    Resolved

  • Monitoring, Regular

    —

    2,4-D

    January 1, 2002 – September 30, 2002

    Resolved

  • Monitoring, Repeat Minor (TCR)

    —

    Coliform (TCR)

    December 1, 1991 – December 31, 1991

    Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

Common questions

Is OAK CREEK WATERWORKS required to publish a Consumer Confidence Report?

Yes. OAK CREEK WATERWORKS 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 OAK CREEK WATERWORKS’s next Consumer Confidence Report due?

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

Does OAK CREEK WATERWORKS have any open drinking water violations on record?

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

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

OAK CREEK CITY CLERK - CATHERINE ROESKE

Phone not on record

Oak Creek, WI 53154