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Public water system record

Crystal City PWS

Serves Crystal City, Jefferson County, MO · 4,733 people served

Federal records show 3 health-based violations and 1 monitoring/reporting issue for Crystal City PWS in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.

  • MO6010198
  • CRYSTAL CITY
  • MO
  • 4,733 served

System profile

Source water Groundwater
ZIP 63019
EPA system ID MO6010198

Verify this system on EPA ECHO →

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

Key facts

  • Crystal City PWS draws water from 3 wells (1 of them for emergency, seasonal or other part-time use).
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 90 µg/L, federal limit 80 µg/L (1.1 times the limit), 2022.
  • Record on file since 1994, with 0 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 1,150 unknown out of 2,104 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
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 82 µg/L, federal limit 80 µg/L (at or just above the limit)
 220 Oct 1, 2022 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 90 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Jul 1, 2022 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 90 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Apr 1, 2022 Resolved No

Monitoring and reporting issues

Since October 2016

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

Issue Start date Status
Revised Total Coliform Rule
Monitoring violation
 Apr 1, 2020 Resolved

Full record since 1994

EPA's records for Crystal City PWS go back to 1994. Before October 19, 2016 they list no health-based violations and 3 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 0 1
2010 to October 18, 2016 0 2
2020s 3 1

What the violations mean

Total Trihalomethanes (TTHMs)

3 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

Crystal City PWS draws water from 3 wells (1 of them for emergency, seasonal or other part-time use). It also has emergency connections to Festus PWS and Herculaneum PWS. 1 other public water system has an emergency connection to Crystal City PWS.

Emergency or part-time connections to

Annual water quality report

Crystal City 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.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

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