OCONTO WATERWORKS

OCONTO, WI · ~4,610 people served

Check your exact address → OCONTO overview

100

Excellent

PurityRadar safety score

PWSID

WI4430495

State

Wisconsin

City

OCONTO

Population served

4,610

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 May 2025). Levels in parts per trillion (ppt).

Lithium

16,000 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jun 2025. Official EPA record →

Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Resolved

Other · EPA contaminant 7500 began Oct 2024 Resolved

Max contaminant level (MCL) · Uranium health-based began Jan 2019 Resolved

Max contaminant level (MCL) · Uranium health-based began Jan 2015 Resolved

Monitoring & reporting · Total coliform began Nov 1999 Resolved

Monitoring & reporting · Total coliform began Dec 1994 Resolved

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

Recent enforcement actions

State action · SIF Jun 2025
State action · SOX Jun 2025
State action · SOX May 2025
State action · SOX May 2019
State action · SFJ May 2019
State action · SIF Mar 2019
State action · SIA Mar 2019
State action · SIE Mar 2019

This profile is built from EPA public records for system WI4430495 — 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.