D30/100
ST CLAIR PWS — Water Quality Report 2026
Serving 4,700 people · Missouri
Water Source
Groundwater
County
—
System ID
MO6010708
Violations
23
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2021 – December 6, 2021Enforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About ST CLAIR PWS
Is ST CLAIR PWS water safe to drink?
ST CLAIR PWS water receives a grade of D (30/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 23 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has ST CLAIR PWS detected?
31 contaminants were tested in ST CLAIR PWS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does ST CLAIR PWS have any EPA violations?
Yes, ST CLAIR PWS has 23 EPA violation(s) on record, with the most recent in 2021. Violation types include Other, MCL, MR. 11 are health-based violations.
How many people does ST CLAIR PWS serve?
ST CLAIR PWS serves approximately 4,700 people, Missouri. The system provides water to 1 community: St. Clair.
What type of water does ST CLAIR PWS provide?
ST CLAIR PWS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MO6010708.
How does ST CLAIR PWS compare to other utilities in Missouri?
ST CLAIR PWS scores 30/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Missouri state page for a full comparison of water systems.