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Community Water System · PWS MO3031366

The Missing Well

Des Peres, Missouri 63131-0000 - drinking water served from surface water sources to 173 people, tracked in EPA SDWIS and UCMR5.

173
People served
1,555
EPA violations
11
Health-based
Untested
UCMR5 result

The verdict

EPA records 1,555 drinking-water violations at The Missing Well, 1% of them health-based - above the Missouri per-system average.

1,555
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
173
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: The Missing Well

The Missing Well is a private-owned community water system that delivers drinking water to 173 residents in Des Peres, Missouri (Benton County) through 68 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 1,555 total violations for this system , of which 11 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 1,323 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 991 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%).

The Missing Well's 1,555 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
173
Total Violations
1,555
Health-Based Violations
11
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
68
County
Benton
School/Daycare
No
MCL Violations
11
Monitoring Violations
1,323
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 991 2011
Public Notice Other 203 2012
Gross Alpha, Excl. Radon and U MR 43 2007
Combined Radium (-226 and -228) MR 31 2007
Radium-226 MR 31 2010
Radium-228 MR 31 2010
Consumer Confidence Rule Other 15 2011
Nitrate-Nitrite MR 14 2009
Coliform (TCR) MCL 11 2015
Barium MR 6 2006
CYANIDE MR 6 2006
Fluoride MR 6 2006
Mercury MR 6 2006
Beryllium, Total MR 6 2006
Selenium MR 6 2006
Cadmium MR 6 2006
Chromium MR 6 2006
Thallium, Total MR 6 2006
Arsenic MR 6 2006
Antimony, Total MR 6 2006
CHLOROBENZENE MR 5 2006
Toluene MR 5 2006
Styrene MR 5 2006
1,2,4-Trichlorobenzene MR 5 2006
cis-1,2-Dichloroethylene MR 5 2006
DICHLOROMETHANE MR 5 2006
o-Dichlorobenzene MR 5 2006
Vinyl chloride MR 5 2006
1,1-Dichloroethylene MR 5 2006
1,2-Dichloroethane MR 5 2006

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 The Missing Well.

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 MO3031366 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 The Missing Well 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
2023 Lead and Copper Rule MR 3 SDWIS / MO3031366 / 5000
2016 Revised Total Coliform Rule MON 4 SDWIS / MO3031366 / 8000
2015 Coliform (TCR) MCL 11 SDWIS / MO3031366 / 3100
2012 Public Notice Other 203 SDWIS / MO3031366 / 7500
2011 Coliform (TCR) MR 991 SDWIS / MO3031366 / 3100
2011 Consumer Confidence Rule Other 15 SDWIS / MO3031366 / 7000
2010 Radium-226 MR 31 SDWIS / MO3031366 / 4020
2010 Radium-228 MR 31 SDWIS / MO3031366 / 4030
2009 Nitrate-Nitrite MR 14 SDWIS / MO3031366 / 1038
2007 Gross Alpha, Excl. Radon and U MR 43 SDWIS / MO3031366 / 4000
2007 Combined Radium (-226 and -228) MR 31 SDWIS / MO3031366 / 4010
2006 Barium MR 6 SDWIS / MO3031366 / 1010
2006 CYANIDE MR 6 SDWIS / MO3031366 / 1024
2006 Fluoride MR 6 SDWIS / MO3031366 / 1025
2006 Mercury MR 6 SDWIS / MO3031366 / 1035

How The Missing Well Compares

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

Metric The Missing Well Missouri avg Federal benchmark
Total violations 1,555 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 11 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 173 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 The Missing Well water safe to drink? ▼
The Missing Well (PWS ID: MO3031366) has 1555 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 173 people using Surface Water sources.
How many people does The Missing Well serve? ▼
The Missing Well serves 173 people in Des Peres, Missouri. It is a Private-owned system using Surface Water water sources with 68 service connections.
What type of violations does The Missing Well have? ▼
The Missing Well has 1,555 total violations: 11 health-based violations (MCL exceedances or treatment failures), 1,323 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in The Missing Well water? ▼
No PFAS testing data is available for The Missing Well under the EPA's UCMR5 monitoring program.
What water source does The Missing Well use? ▼
The Missing Well uses Surface Water 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.