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Community Water System · PWS LA1073061

Hidden Oaks Subdivision WS

West Monroe, Louisiana 71294 - drinking water served from groundwater sources to 438 people, tracked in EPA SDWIS and UCMR5.

438
People served
242
EPA violations
173
Health-based
Untested
UCMR5 result

The verdict

EPA records 242 drinking-water violations at Hidden Oaks Subdivision WS, 71% of them health-based - above the Louisiana per-system average.

242
Total EPA violations on record
71%
Health-based (MCL / treatment failure)
438
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hidden Oaks Subdivision WS

Hidden Oaks Subdivision WS is a private-owned community water system that delivers drinking water to 438 residents in West Monroe, Louisiana (Ouachita Parish County) through 146 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 242 total violations for this system , of which 173 (71%) 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 2022.

The most frequently cited contaminant at this system is TTHM, recorded in 117 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Louisiana, EPA tracks 1,234 public water systems serving 5,316,532 people, with 115,060 cumulative violations and 62,164 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 93.2 violations. Statewide, 218 of 265 UCMR5-tested systems have reported PFAS detections (82.3%).

Hidden Oaks Subdivision WS's 242 violations sit above the Louisiana 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
438
Total Violations
242
Health-Based Violations
173
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
146
County
Ouachita Parish
School/Daycare
No
MCL Violations
173
Monitoring Violations
55
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 117 2022
Total Haloacetic Acids (HAA5) MCL 52 2019
TTHM MR 23 2016
Total Haloacetic Acids (HAA5) MR 23 2016
Chloramine MR 5 2014
Consumer Confidence Rule Other 5 2017
Coliform (TCR) MR 4 2014
Coliform (TCR) MCL 4 1991
Public Notice Other 2 2014

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 Hidden Oaks Subdivision WS.

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 LA1073061 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Louisiana Drinking Water Authority

Louisiana's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find LA regulator via EPA SDWIS

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
2022 TTHM MCL 117 SDWIS / LA1073061 / 2950
2019 Total Haloacetic Acids (HAA5) MCL 52 SDWIS / LA1073061 / 2456
2017 Consumer Confidence Rule Other 5 SDWIS / LA1073061 / 7000
2016 TTHM MR 23 SDWIS / LA1073061 / 2950
2016 Total Haloacetic Acids (HAA5) MR 23 SDWIS / LA1073061 / 2456
2014 Chloramine MR 5 SDWIS / LA1073061 / 1006
2014 Coliform (TCR) MR 4 SDWIS / LA1073061 / 3100
2014 Public Notice Other 2 SDWIS / LA1073061 / 7500
1991 Coliform (TCR) MCL 4 SDWIS / LA1073061 / 3100

How Hidden Oaks Subdivision WS Compares

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

Metric Hidden Oaks Subdivision WS Louisiana avg Federal benchmark
Total violations 242 93.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 173 50.4 Indicates a contaminant exceeded a federal MCL
PFAS detection None 82.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 438 4,308 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,234 regulated public water systems in Louisiana.

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 Hidden Oaks Subdivision WS water safe to drink? ▼
Hidden Oaks Subdivision WS (PWS ID: LA1073061) has 242 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 438 people using Groundwater sources.
How many people does Hidden Oaks Subdivision WS serve? ▼
Hidden Oaks Subdivision WS serves 438 people in West Monroe, Louisiana. It is a Private-owned system using Groundwater water sources with 146 service connections.
What type of violations does Hidden Oaks Subdivision WS have? ▼
Hidden Oaks Subdivision WS has 242 total violations: 173 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 Hidden Oaks Subdivision WS water? ▼
No PFAS testing data is available for Hidden Oaks Subdivision WS under the EPA's UCMR5 monitoring program.
What water source does Hidden Oaks Subdivision WS use? ▼
Hidden Oaks Subdivision WS 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.