St. Louis, Missouri Water Quality Report
Water quality data for 10 water systems serving 317,738 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 45.3 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 453% | Above guideline |
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Compliance & Violations
Active Violations (9)
71
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
4G
Oct 17, 2024
4G
Oct 17, 2024
34
Oct 1, 2018
4A
Oct 1, 2018
51
Jan 1, 1996
51
Jan 1, 1996
Resolved Violations (491)
19
Jun 1, 2025 — Jun 30, 2025
19
Mar 1, 2025 — Mar 31, 2025
4G
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
+ 486 more resolved violations
Frequently Asked Questions
Is St. Louis tap water safe to drink?
St. Louis's water meets all EPA maximum contaminant levels. However, 1 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in St. Louis tap water?
1 contaminants have been detected in St. Louis's water supply across 10 water systems. See the full contaminant table above for details.
How can I improve my water quality in St. Louis?
Install a water filter rated for the specific contaminants found in St. Louis's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does St. Louis have any water quality violations?
Yes, St. Louis currently has 127 active violations. See the violations section above for details.