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Clifton Hill, MO Tap Water Quality 2026

Water quality report for Clifton Hill, MO — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Clifton Hill's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Thomas Hill Pwsd 1 PWSID: MO2024504 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 3.09 ppb, 21% of the action level and no violations are open. PFAS was sampled but not enough times for a compliance determination.

B

Clifton Hill earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 3.09 ppb — 21% of the federal action level
PFAS sampled, too few results to judge
3 violations since 2015, 0 health-based
No violations currently open
Clifton Hill's lead level vs. all Missouri community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 3.09 ppb — 21% of the federal action level
✓ Lower lead than 34% of Missouri utilities
Population Served
88
~4500 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
3 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
21% of EPA action level
3.09 ppb
Action level: 15 ppb
The 90th-percentile lead result is 3.09 ppb, 21% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2025 Unaddressed
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2024 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

3 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Thomas Hill Pwsd 1
PWSID MO2024504
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 88
Service connections 4,500
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Clifton Hill tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 3.09 ppb, 21% of the action level.
Does Clifton Hill water have PFAS? ▼
It was sampled, but no sampling point had enough results for a compliance determination.
Who supplies water to Clifton Hill? ▼
Thomas Hill Pwsd 1 (PWSID MO2024504). Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2025-03-19. No significant deficiencies were recorded.

What Should Clifton Hill Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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