C56/100
UNIONVILLE PWS — Water Quality Report 2026
Serving 1,735 people · Missouri
Water Source
Purchased Surface Water
County
—
System ID
MO2010804
Violations
13
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.006 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
4
Violations (last 5yr)
0
Unresolved
2
Health-Related
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: November 1, 2024 – November 30, 2024Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: October 25, 2021 – February 28, 2022Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 1 — URGENTResolved
Violation related to Nitrate
When: July 1, 2021 – July 31, 2021Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 1 — URGENTResolved
Violation related to Nitrate
When: July 1, 2021 – July 31, 2021Rule: Surface Water Treatment 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 UNIONVILLE PWS
Is UNIONVILLE PWS water safe to drink?
UNIONVILLE PWS water receives a grade of C (56/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 13 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has UNIONVILLE PWS detected?
1 contaminants were tested in UNIONVILLE PWS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does UNIONVILLE PWS have any EPA violations?
Yes, UNIONVILLE PWS has 13 EPA violation(s) on record, with the most recent in 2024. Violation types include MON, Other, TT. 7 are health-based violations.
How many people does UNIONVILLE PWS serve?
UNIONVILLE PWS serves approximately 1,735 people, Missouri. The system provides water to 1 community: Unionville.
What type of water does UNIONVILLE PWS provide?
UNIONVILLE PWS sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is MO2010804.
How does UNIONVILLE PWS compare to other utilities in Missouri?
UNIONVILLE PWS scores 56/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Missouri state page for a full comparison of water systems.