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Community Water System · PWS MO3010822

Vienna PWS

Vienna, Missouri 65582-0000 - drinking water served from groundwater sources to 591 people, tracked in EPA SDWIS and UCMR5.

591
People served
125
EPA violations
32
Health-based
Untested
UCMR5 result

The verdict

EPA records 125 drinking-water violations at Vienna PWS, 26% of them health-based - above the Missouri per-system average.

125
Total EPA violations on record
26%
Health-based (MCL / treatment failure)
591
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Vienna PWS

Vienna PWS is a local-owned community water system that delivers drinking water to 591 residents in Vienna, Missouri (Maries County) through 321 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 125 total violations for this system , of which 32 (26%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 55 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 50 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Missouri, EPA tracks 2,823 public water systems serving 5,855,885 people, with 201,695 cumulative violations and 54,821 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 71.4 violations. Statewide, 162 of 230 UCMR5-tested systems have reported PFAS detections (70.4%).

Vienna PWS's 125 violations sit above the Missouri average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
591
Total Violations
125
Health-Based Violations
32
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
321
County
Maries
School/Daycare
No
MCL Violations
32
Monitoring Violations
55
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 50 2007
Coliform (TCR) MCL 19 2009
Revised Total Coliform Rule RPT 15 2025
Tetrachloroethylene MCL 13 2012
LEAD AND COPPER RULE REVISIONS RPT 4 2024
Revised Total Coliform Rule MON 3 2024
Nitrate-Nitrite MR 1 2008
Lead and Copper Rule MR 1 2013

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Vienna PWS.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID MO3010822 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Missouri Drinking Water Authority

Missouri DNR, Public Drinking Water Branch is the primacy agency that licenses and inspects Vienna PWS under EPA-delegated authority.

Open MO regulator portal

Source: Missouri DNR, Public Drinking Water Branch

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 Revised Total Coliform Rule RPT 15 SDWIS / MO3010822 / 8000
2024 LEAD AND COPPER RULE REVISIONS RPT 4 SDWIS / MO3010822 / 5200
2024 Revised Total Coliform Rule MON 3 SDWIS / MO3010822 / 8000
2013 Lead and Copper Rule MR 1 SDWIS / MO3010822 / 5000
2012 Tetrachloroethylene MCL 13 SDWIS / MO3010822 / 2987
2009 Coliform (TCR) MCL 19 SDWIS / MO3010822 / 3100
2008 Nitrate-Nitrite MR 1 SDWIS / MO3010822 / 1038
2007 Coliform (TCR) MR 50 SDWIS / MO3010822 / 3100

How Vienna PWS Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Vienna PWS Missouri avg Federal benchmark
Total violations 125 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 32 19.4 Indicates a contaminant exceeded a federal MCL
PFAS detection None 70.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 591 2,074 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,823 regulated public water systems in Missouri.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Vienna PWS water safe to drink? ▼
Vienna PWS (PWS ID: MO3010822) has 125 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 591 people using Groundwater sources.
How many people does Vienna PWS serve? ▼
Vienna PWS serves 591 people in Vienna, Missouri. It is a Local-owned system using Groundwater water sources with 321 service connections.
What type of violations does Vienna PWS have? ▼
Vienna PWS has 125 total violations: 32 health-based violations (MCL exceedances or treatment failures), 55 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Vienna PWS water? ▼
No PFAS testing data is available for Vienna PWS under the EPA's UCMR5 monitoring program.
What water source does Vienna PWS use? ▼
Vienna PWS uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.