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Water system · PWSID MO2024138

CLARK COUNTY CONS PWSD 1

WILLIAMSTOWN, MO · ~7,140 people served

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

PWSID

MO2024138

State

Missouri

City

WILLIAMSTOWN

Population served

7,140

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

6

Violations on record

0

Unaddressed

0

Health-based

12

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Apr 2024. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Dec 2023 Resolved
Monitoring · Lead & Copper Rule began Oct 2022 Resolved
Other · EPA contaminant 7000 began Jul 2019 Resolved
Monitoring & reporting · EPA contaminant 0600 began Apr 2008 Resolved
Monitoring & reporting · Total coliform began May 2003 Resolved
Monitoring & reporting · Gross alpha began Nov 1994 Resolved

Recent enforcement actions

  • State action · SOX Apr 2024
  • State action · SIF Jan 2023
  • State action · SIA Dec 2022
  • State action · SIE Dec 2022
  • State action · SOX Nov 2022
  • State action · SOX Nov 2019
  • State action · SOX Jan 2014
  • EPA/federal action · EOX May 2008

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

Nitrate

3 stations · latest Mar 2023

1.05 · max 3.63 mg/l as N · 81

Lead

3 stations · latest May 2023

0.19 · max 23.2 ug/l · 34

Arsenic

3 stations · latest May 2023

0.94 · max 1.6 ug/l · 21

Copper

3 stations · latest May 2023

1.3 · max 3 ug/l · 21

Fluoride

3 stations · latest May 2023

0.2 · max 0.23 mg/l · 21

Manganese

3 stations · latest May 2023

56.5 · max 340 ug/l · 21

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 MO2024138 — 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.