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Community Water System · PWS LA1097026

Hidden Hills Subdivision Water System

Arnaudville, Louisiana 70512 - drinking water served from groundwater sources to 240 people, tracked in EPA SDWIS and UCMR5.

240
People served
144
EPA violations
97
Health-based
Untested
UCMR5 result

The verdict

EPA records 144 drinking-water violations at Hidden Hills Subdivision Water System, 67% of them health-based - above the Louisiana per-system average.

144
Total EPA violations on record
67%
Health-based (MCL / treatment failure)
240
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hidden Hills Subdivision Water System

Hidden Hills Subdivision Water System is a private-owned community water system that delivers drinking water to 240 residents in Arnaudville, Louisiana (St. Landry Parish County) through 80 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 144 total violations for this system , of which 97 (67%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 19 monitoring and reporting violations are on file. The most recent violation on record dates to 2018.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 93 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 Hills Subdivision Water System's 144 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
240
Total Violations
144
Health-Based Violations
97
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
80
County
St. Landry Parish
School/Daycare
No
MCL Violations
93
Monitoring Violations
19
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 93 2003
Consumer Confidence Rule Other 11 2017
Coliform (TCR) MR 8 2012
Public Notice Other 5 2012
TTHM MR 4 2013
Total Haloacetic Acids (HAA5) MR 4 2013
Lead and Copper Rule MR 3 1993
Lead and Copper Rule TT 2 2018
Groundwater Rule TT 2 2011

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 Hills Subdivision Water System.

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 LA1097026 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
2018 Lead and Copper Rule TT 2 SDWIS / LA1097026 / 5000
2017 Consumer Confidence Rule Other 11 SDWIS / LA1097026 / 7000
2013 TTHM MR 4 SDWIS / LA1097026 / 2950
2013 Total Haloacetic Acids (HAA5) MR 4 SDWIS / LA1097026 / 2456
2012 Coliform (TCR) MR 8 SDWIS / LA1097026 / 3100
2012 Public Notice Other 5 SDWIS / LA1097026 / 7500
2011 Groundwater Rule TT 2 SDWIS / LA1097026 / 0700
2003 Coliform (TCR) MCL 93 SDWIS / LA1097026 / 3100
1993 Lead and Copper Rule MR 3 SDWIS / LA1097026 / 5000

How Hidden Hills Subdivision Water System Compares

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

Metric Hidden Hills Subdivision Water System Louisiana avg Federal benchmark
Total violations 144 93.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 97 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 240 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 Hills Subdivision Water System water safe to drink? ▼
Hidden Hills Subdivision Water System (PWS ID: LA1097026) has 144 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 240 people using Groundwater sources.
How many people does Hidden Hills Subdivision Water System serve? ▼
Hidden Hills Subdivision Water System serves 240 people in Arnaudville, Louisiana. It is a Private-owned system using Groundwater water sources with 80 service connections.
What type of violations does Hidden Hills Subdivision Water System have? ▼
Hidden Hills Subdivision Water System has 144 total violations: 97 health-based violations (MCL exceedances or treatment failures), 19 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Hidden Hills Subdivision Water System water? ▼
No PFAS testing data is available for Hidden Hills Subdivision Water System under the EPA's UCMR5 monitoring program.
What water source does Hidden Hills Subdivision Water System use? ▼
Hidden Hills Subdivision Water System 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.