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Public water system record

Portage Des Sioux PWS

Serves Portage Des Sioux, St. Charles County, MO · 345 people served

Federal records show 1 health-based violation and 3 monitoring/reporting issues for Portage Des Sioux PWS in the last ten years. The most serious issue in this window was a resolved Groundwater Rule violation.

  • MO6010657
  • PORTAGE DES SIOUX
  • MO
  • 345 served

System profile

Source water Groundwater
ZIP 63373
EPA system ID MO6010657

Verify this system on EPA ECHO →

Health-based violations, last 10 years
1
Resolved
1
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
3

Key facts

  • Portage Des Sioux PWS draws water from 1 well.
  • Most recent formal enforcement: signed compliance agreement by Missouri, October 1995.
  • Record on file since 1993, with 3 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 73 unknown out of 195 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Groundwater Rule
Treatment technique failure
 140 Oct 24, 2015 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Consumer Confidence Rule
OTHER
 Jul 1, 2019 Resolved
Revised Total Coliform Rule
Monitoring violation
 Apr 1, 2019 Resolved
Public Notice
OTHER
 Feb 7, 2016 Resolved

Full record since 1993

EPA's records for Portage Des Sioux PWS go back to 1993. Before October 19, 2016 they list 3 health-based violations (1 resolved, 2 archived by EPA without a recorded fix) and 52 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 2 41
2000s 0 2
2010 to October 18, 2016 1 9
October 19, 2016 to 2019 0 2

Most recent health-based violation before October 19, 2016: Groundwater Rule, began October 2015, Resolved.

Show all 3 health-based violations before October 19, 2016
Contaminant Start date Status
Groundwater Rule
Treatment technique failure
 Oct 24, 2015 Resolved
Total Coliform
Contaminant limit exceeded
 May 1, 1996 Archived
Total Coliform
Contaminant limit exceeded
 Sep 1, 1995 Archived

Enforcement actions

Missouri regulators took 1 formal enforcement action against Portage Des Sioux PWS in 1995. The most recent was a signed compliance agreement in October 1995.

Date By Action Violations covered
Oct 17, 1995 Missouri Signed compliance agreement 1 violation: Lead and Copper Rule

What the violations mean

Groundwater Rule

1 incident

The system did not complete a treatment step or action that the Groundwater Rule requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Portage Des Sioux PWS draws water from 1 well.

Annual water quality report

Portage Des Sioux PWS must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Portage Des Sioux PWS for a copy.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Missouri.

Certified drinking water labs by state EPA guidance for private wells