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Maryville, MO Tap Water Quality 2026

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

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

Main Utility: Maryville Pws PWSID: MO1010508 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 6.05 ppb, 40% of the action level and no violations are open. PFAS was sampled but not enough times for a compliance determination.

C

Maryville earns a C for water quality

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

Lead: 6.05 ppb — 40% of the federal action level
PFAS sampled, too few results to judge
13 violations since 2015, 4 health-based
No violations currently open
Maryville's lead level vs. all Missouri community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 6.05 ppb — 40% of the federal action level
✓ Lower lead than 8% of Missouri utilities
Population Served
10588
~4221 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
13 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
40% of EPA action level
6.05 ppb
Action level: 15 ppb
The 90th-percentile lead result is 6.05 ppb, 40% 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
Public Notice OTHER — — 2026 Resolved
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Public Notice OTHER — — 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Chlorite MONITORING AND REPORTING — 1.0 mg/L 2024 Resolved
Chlorite MCL EXCEEDANCE 1.1 MG/L 1.0 mg/L 2024 Resolved
Chlorite MCL EXCEEDANCE 1.3 MG/L 1.0 mg/L 2024 Resolved
Chlorite MONITORING AND REPORTING — 1.0 mg/L 2024 Resolved
Chlorine dioxide MONITORING AND REPORTING — 0.8 mg/L 2024 Resolved
Chlorite MONITORING AND REPORTING — 1.0 mg/L 2023 Resolved
Public Notice OTHER — — 2023 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Resolved
Groundwater Rule OTHER — — 2022 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

13 violations are on record since 2015, of which 4 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Maryville Pws
PWSID MO1010508
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 10,588
Service connections 4,221
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Maryville tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 6.05 ppb, 40% of the action level.
Does Maryville water have PFAS? ▼
It was sampled, but no sampling point had enough results for a compliance determination.
Who supplies water to Maryville? ▼
Maryville Pws (PWSID MO1010508), one of 2 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2022-06-01. Inspectors recorded 2 significant deficiencies.

What Should Maryville Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
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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