F0/100
POTOSI PWS — Water Quality Report 2026
Serving 2,527 people · Missouri
Water Source
Groundwater
County
—
System ID
MO6010659
Violations
91
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
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: April 27, 2024 – May 17, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: March 1, 2023 – March 31, 2023Rule: Total Coliform RuleEnforcement: 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 POTOSI PWS
Is POTOSI PWS water safe to drink?
POTOSI PWS water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 91 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has POTOSI PWS detected?
1 contaminants were tested in POTOSI PWS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does POTOSI PWS have any EPA violations?
Yes, POTOSI PWS has 91 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, MON, MCL. 79 are health-based violations.
How many people does POTOSI PWS serve?
POTOSI PWS serves approximately 2,527 people, Missouri. The system provides water to 1 community: Potosi.
What type of water does POTOSI PWS provide?
POTOSI PWS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MO6010659.
How does POTOSI PWS compare to other utilities in Missouri?
POTOSI PWS scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Missouri state page for a full comparison of water systems.