D30/100
St Clair Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 4,700 residents · Missouri
What's In St Clair's Tap Water?
31
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
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
Water Utility Details
ST CLAIR PWS
Population Served
4,700
Water Source
Groundwater
System ID
MO6010708
Frequently Asked Questions About St Clair Water
Is St Clair tap water safe to drink?
St Clair, Missouri tap water receives a grade of D (30/100), which is considered poor. 0 contaminant(s) exceed EPA maximum contaminant levels and 23 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in St Clair's water?
Of the 31 contaminants tested in St Clair's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does St Clair have any water quality violations?
Yes, St Clair has 23 EPA violation(s) on record, with the most recent in 2021. Violation types include Other, MCL, MR. 11 of these are health-based violations, which are the most serious category.
Do I need a water filter in St Clair?
St Clair water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does St Clair's tap water come from?
St Clair's drinking water is sourced from groundwater and supplied by ST CLAIR PWS. The system serves approximately 4,700 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is St Clair's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. St Clair's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does St Clair's water compare to other cities in Missouri?
St Clair's water quality score of 30/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our Missouri state page to see how all cities in the state compare.
What should I do if I'm concerned about St Clair's water quality?
If you have concerns about St Clair's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (ST CLAIR PWS) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.