OCONOMOWOC WATERWORKS

Oconomowoc, WI · ~15,805 people served

Check your exact address → Oconomowoc overview

100

Excellent

PurityRadar safety score

PWSID

WI2680227

State

Wisconsin

City

Oconomowoc

Population served

15,805

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Sep 2023). Levels in parts per trillion (ppt).

PFBA

5.4 ppt

limit —

No federal limit

PFBS

4.5 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2015. Official EPA record →

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2014 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2014 Resolved

Other · EPA contaminant 7000 began Jul 2007 Resolved

Other · EPA contaminant 7500 began Apr 2006 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 2005 Resolved

Max contaminant level (MCL) · Total coliform health-based began Nov 2001 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jul 1996 Resolved

Max contaminant level (MCL) · Total coliform health-based began Sep 1995 Resolved

Monitoring & reporting · Lead & Copper Rule began Jul 1992 Resolved

Recent enforcement actions

State action · SOX Aug 2015
State action · SFG Jul 2015
State action · SIF Jun 2015
State action · SIA Nov 2014
State action · SIE Nov 2014
State action · SO6 Feb 2011
State action · SOX Feb 2008
State action · SOX Jul 2007

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Manganese

1 station · latest May 2022

1.03 · max 1.03 ug/L · 1

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system WI2680227 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.