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Water system · PWSID WI1110111

RIO WATERWORKS

RIO, WI · ~1,095 people served

Check your exact address → RIO overview
100
Excellent
PurityRadar safety score

PWSID

WI1110111

State

Wisconsin

City

RIO

Population served

1,095

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

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

17

Violations on record

2

Unaddressed

1

Health-based

56

Enforcement actions

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

Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Unaddressed
Other · EPA contaminant 7500 began Oct 2024 Unaddressed
Monitoring & reporting · Lead & Copper Rule began Jan 2024 Resolved
Other · EPA contaminant 0700 began Sep 2018 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2014 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2014 Resolved
Monitoring & reporting · Nitrate began Jul 2010 Resolved
Monitoring & reporting · Gross alpha began Jan 2009 Resolved
Monitoring & reporting · Uranium began Jan 2009 Resolved
Monitoring & reporting · EPA contaminant 4030 began Jan 2009 Resolved
Monitoring & reporting · EPA contaminant 4030 began Jan 2009 Resolved
Monitoring & reporting · Nitrate began Jul 2008 Resolved

Recent enforcement actions

  • EPA/federal action · EIA Jun 2025
  • State action · SOX Jan 2024
  • State action · SIA Jan 2024
  • State action · SIA Dec 2018
  • State action · SOX Sep 2018
  • State action · SOX Aug 2015
  • State action · SIF Oct 2014
  • State action · SIE Oct 2014

This profile is built from EPA public records for system WI1110111 — 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.