O'FALLON, MO · St. Charles County
LAKE CHARLES HILLS SUBD Water System
Inactive system
This water system is marked inactive in EPA’s federal records as of March 1, 1990. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.
If you are a resident looking for your current water provider, see water systems in St. Charles County, MO.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Missouri’s official records. Always confirm current status with Missouri before making decisions based on this information.
System facts
- System ID (PWSID)
- MO6036005
- System type
- Community Water System
- Population served
- 800
- Service connections
- 220
- Ownership
- privately owned
- Water source
- groundwater (wells)
LAKE CHARLES HILLS SUBD is one of 489 community water systems in Missouri in the 501 to 3,300 people size category, formerly serving 800 people from groundwater.
EPA's federal records list this system as inactive in 1990; the record below is historical.
As of August 1, 2026, its federal record holds 3 entries between 1979 and 1984, all of which EPA lists as closed. Nothing has been added since 1984.
None of the 3 are monitoring or reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset; these involve water-quality, treatment, or public-notice findings instead. The record involves the Radionuclides and Revised Rad Rule.
Violation history
Maximum Contaminant Level Violation, Average
Health-basedGross Alpha, Excl. Radon and U
May 4, 1984 – October 3, 1984
ArchivedMaximum Contaminant Level Violation, Average
Health-basedCombined Radium (-226 and -228)
October 25, 1979 – October 24, 1982
ArchivedMaximum Contaminant Level Violation, Average
Health-basedCombined Radium (-226 and -228)
October 25, 1979 – October 24, 1983
Archived
Archived closed in EPA's records (typically due to age or a data correction)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| May 4, 1984 – October 3, 1984 | Maximum Contaminant Level Violation, Average | Gross Alpha, Excl. Radon and U | Health-based | Archived |
| October 25, 1979 – October 24, 1982 | Maximum Contaminant Level Violation, Average | Combined Radium (-226 and -228) | Health-based | Archived |
| October 25, 1979 – October 24, 1983 | Maximum Contaminant Level Violation, Average | Combined Radium (-226 and -228) | Health-based | Archived |
Archived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
No enforcement actions on record for this system.
Last known contact on file (system is inactive)
Not on record
314-272-6244
O'FALLON, MO 63366