PlainWater
States → Missouri

Community Water System · PWS MO5031481

Oak Brook Estates

Walnut Shade, Missouri 65771-0000 - drinking water served from groundwater sources to 40 people, tracked in EPA SDWIS and UCMR5.

40
People served
103
EPA violations
6
Health-based
Untested
UCMR5 result

The verdict

EPA records 103 drinking-water violations at Oak Brook Estates, 6% of them health-based - above the Missouri per-system average.

103
Total EPA violations on record
6%
Health-based (MCL / treatment failure)
40
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Oak Brook Estates

Oak Brook Estates is a private-owned community water system that delivers drinking water to 40 residents in Walnut Shade, Missouri (Taney County) through 16 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 103 total violations for this system , of which 6 (6%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 79 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 Revised Total Coliform Rule, recorded in 31 violations (MON). 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, 71 of 230 UCMR5-tested systems have reported PFAS detections (30.9%).

Oak Brook Estates's 103 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
40
Total Violations
103
Health-Based Violations
6
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
16
County
Taney
School/Daycare
No
MCL Violations
0
Monitoring Violations
79
Treatment Tech Violations
6

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Revised Total Coliform Rule MON 31 2021
E. COLI MR 16 2021
Consumer Confidence Rule Other 8 2025
Lead and Copper Rule MR 6 2021
TTHM MR 6 2021
Stage 1 Disinfectants and Disinfection Byproducts Rule TT 6 2021
Stage 2 Disinfectants and Disinfection Byproducts Rule MR 6 2021
Total Haloacetic Acids (HAA5) MR 6 2021
Nitrate-Nitrite MR 5 2021
Public Notice Other 3 2021
Coliform (TCR) MR 3 2008
LEAD AND COPPER RULE REVISIONS RPT 1 2024

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 Oak Brook Estates.

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 MO5031481 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 Oak Brook Estates 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 Consumer Confidence Rule Other 8 SDWIS / MO5031481 / 7000
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / MO5031481 / 5200
2021 Revised Total Coliform Rule MON 31 SDWIS / MO5031481 / 8000
2021 E. COLI MR 16 SDWIS / MO5031481 / 3014
2021 Lead and Copper Rule MR 6 SDWIS / MO5031481 / 5000
2021 TTHM MR 6 SDWIS / MO5031481 / 2950
2021 Stage 1 Disinfectants and Disinfection Byproducts Rule TT 6 SDWIS / MO5031481 / 0400
2021 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 6 SDWIS / MO5031481 / 0600
2021 Total Haloacetic Acids (HAA5) MR 6 SDWIS / MO5031481 / 2456
2021 Nitrate-Nitrite MR 5 SDWIS / MO5031481 / 1038
2021 Public Notice Other 3 SDWIS / MO5031481 / 7500
2008 Coliform (TCR) MR 3 SDWIS / MO5031481 / 3100

How Oak Brook Estates Compares

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

Metric Oak Brook Estates Missouri avg Federal benchmark
Total violations 103 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 6 19.4 Indicates a contaminant exceeded a federal MCL
PFAS detection None 30.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 40 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 Oak Brook Estates water safe to drink? ▼
Oak Brook Estates (PWS ID: MO5031481) has 103 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 40 people using Groundwater sources.
How many people does Oak Brook Estates serve? ▼
Oak Brook Estates serves 40 people in Walnut Shade, Missouri. It is a Private-owned system using Groundwater water sources with 16 service connections.
What type of violations does Oak Brook Estates have? ▼
Oak Brook Estates has 103 total violations: 6 health-based violations (MCL exceedances or treatment failures), 79 monitoring/reporting violations, and 6 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Oak Brook Estates water? ▼
No PFAS testing data is available for Oak Brook Estates under the EPA's UCMR5 monitoring program.
What water source does Oak Brook Estates use? ▼
Oak Brook Estates 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.