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Mosby, MO Tap Water Quality 2026

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

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

Main Utility: Mosby Pws PWSID: MO1010546 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS has never been sampled at this system.

B

Mosby earns a B for water quality

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

Lead: not detected
PFAS never sampled at this system
34 violations since 2015, 23 health-based
No violations currently open
Mosby's lead level vs. all Missouri community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Missouri utilities
Population Served
44
~48 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
34 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Public Notice OTHER — — 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
TTHM MCL EXCEEDANCE 82 UG/L 0.080 mg/L 2025 Resolved
Public Notice OTHER — — 2023 Resolved
Consumer Confidence Rule OTHER — — 2023 Resolved
TTHM MCL EXCEEDANCE 93 UG/L 0.080 mg/L 2023 Resolved
TTHM MCL EXCEEDANCE 91 UG/L 0.080 mg/L 2023 Resolved
TTHM MCL EXCEEDANCE 95 UG/L 0.080 mg/L 2022 Resolved
Consumer Confidence Rule OTHER — — 2022 Resolved
TTHM MCL EXCEEDANCE 94 UG/L 0.080 mg/L 2022 Resolved
TTHM MCL EXCEEDANCE 92 UG/L 0.080 mg/L 2022 Resolved
TTHM MCL EXCEEDANCE 94 UG/L 0.080 mg/L 2022 Resolved
TTHM MCL EXCEEDANCE 89 UG/L 0.080 mg/L 2021 Resolved
TTHM MCL EXCEEDANCE 86 UG/L 0.080 mg/L 2021 Resolved
Consumer Confidence Rule OTHER — — 2021 Resolved
TTHM MCL EXCEEDANCE 89 UG/L 0.080 mg/L 2021 Resolved
TTHM MCL EXCEEDANCE 87 UG/L 0.080 mg/L 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2020 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 97 UG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 104 UG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 104 UG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 109 UG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 106 UG/L 0.080 mg/L 2019 Resolved
TTHM MCL EXCEEDANCE 92 UG/L 0.080 mg/L 2019 Resolved
Public Notice OTHER — — 2019 Resolved
TTHM MCL EXCEEDANCE 93 UG/L 0.080 mg/L 2019 Resolved
Public Notice OTHER — — 2019 Resolved
TTHM MCL EXCEEDANCE 91 UG/L 0.080 mg/L 2019 Resolved
TTHM MCL EXCEEDANCE 86 UG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 87 UG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 87.9 UG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 94 UG/L 0.080 mg/L 2016 Archived
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

34 violations are on record since 2015, of which 23 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Mosby Pws
PWSID MO1010546
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 44
Service connections 48
Systems serving this area 4
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Mosby tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Mosby water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Mosby? ▼
Mosby Pws (PWSID MO1010546), one of 4 systems serving this area. Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2024-07-09. No significant deficiencies were recorded.

What Should Mosby 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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