D26/100
HILLSBORO PWS — Water Quality Report 2026
Serving 3,000 people · Missouri
Water Source
Groundwater
County
—
System ID
MO6010368
Violations
19
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.004 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
4
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: September 28, 2025 – September 30, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Maximum contaminant level violation
When: June 30, 2025 – July 29, 2025Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: February 1, 2024 – March 15, 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: December 1, 2022 – December 31, 2022Rule: 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 HILLSBORO PWS
Is HILLSBORO PWS water safe to drink?
HILLSBORO PWS water receives a grade of D (26/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 19 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has HILLSBORO PWS detected?
1 contaminants were tested in HILLSBORO PWS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does HILLSBORO PWS have any EPA violations?
Yes, HILLSBORO PWS has 19 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, TT, MON. 13 are health-based violations.
How many people does HILLSBORO PWS serve?
HILLSBORO PWS serves approximately 3,000 people, Missouri. The system provides water to 1 community: Hillsboro.
What type of water does HILLSBORO PWS provide?
HILLSBORO PWS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MO6010368.
How does HILLSBORO PWS compare to other utilities in Missouri?
HILLSBORO PWS scores 26/100 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.