Tapcensus

ST Charles County Pwsd 2

Community water system in St. Charles County, Missouri, serving 100,587 people from surface water purchased. 1 rule violated in the past three years. Owned by local government. System ID MO6024530.

People served 100,587 surface water purchased
Rules violated, past 3 years 1 one rule can carry several violations
Unresolved 0 rules still in violation, EPA data updated Oct 7, 2026
Quarters with violations 1 of the last 12 quarters

Quarterly compliance history

–Q4
2023
–Q1
2024
–Q2
2024
–Q3
2024
–Q4
2024
–Q1
2025
–Q2
2025
VQ3
2025
–Q4
2025
–Q1
2026
–Q2
2026
–Q3
2026
UQ4
2026
–No violation identified VViolation identified SSerious violator (EPA enforcement priority) UUndetermined Oldest quarter on the left. Quarters 1 to 12 are the twelve most recently completed quarters at EPA's last data refresh; the 13th is the current quarter up to that date, which EPA reports as undetermined.

Rules violated in the past three years

Oct to Dec 2023 to Oct to Dec 2026

Groundwater Rule (GWR)

The 2006 GWR requires regular sanitary surveys of groundwater systems and targeted corrective action when fecal indicators are found in source water.
EPA rule code 0700 · Treatment Technique

What it means: The 2006 GWR requires regular sanitary surveys of groundwater systems and targeted corrective action when fecal indicators are found in source water. Systems with significant deficiencies must provide 4-log virus treatment (99.99% removal/inactivation) or fix the deficiency.

Health effects: Protects against enteric viruses, which can contaminate groundwater via cracked well casings, failing septic systems, or animal waste. Viruses persist longer in groundwater than in surface water. Hepatitis A and norovirus are the primary pathogens of concern.

Limit: Treatment technique: 4-log virus treatment required when source water has fecal indicators or significant sanitary deficiencies

About this rule
About this data

EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several in the same period. Unresolved means still in violation at EPA's latest data refresh. Measured contaminant levels are not part of this record; each system publishes them in its annual Consumer Confidence Report.

Service area from EPA's Public Water System Service Area Boundaries dataset: County. The system's location is the centre of the service area EPA publishes for the system.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Missouri records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.