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Community Water System · PWS LA1055137

Magnolia-Markridge Park Subdivision

Des Peres, Louisiana 63131 - drinking water served from groundwater sources to 468 people, tracked in EPA SDWIS and UCMR5.

468
People served
46
EPA violations
5
Health-based
Untested
UCMR5 result

The verdict

EPA records 46 drinking-water violations at Magnolia-Markridge Park Subdivision, 11% of them health-based - below the Louisiana per-system average.

46
Total EPA violations on record
11%
Health-based (MCL / treatment failure)
468
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Magnolia-Markridge Park Subdivision

Magnolia-Markridge Park Subdivision is a private-owned community water system that delivers drinking water to 468 residents in Des Peres, Louisiana (Lafayette Parish County) through 156 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 46 total violations for this system , of which 5 (11%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 29 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is TTHM, recorded in 8 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 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%).

Magnolia-Markridge Park Subdivision's 46 violations sit below 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
468
Total Violations
46
Health-Based Violations
5
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
156
County
Lafayette Parish
School/Daycare
No
MCL Violations
3
Monitoring Violations
29
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MR 8 2013
Total Haloacetic Acids (HAA5) MR 8 2013
Public Notice Other 6 2015
Chlorine MR 4 2015
Lead and Copper Rule MR 4 2016
Coliform (TCR) MCL 3 2002
Coliform (TCR) MR 3 2013
Groundwater Rule TT 2 2011
Stage 2 Disinfectants and Disinfection Byproducts Rule MR 2 2013
Revised Total Coliform Rule Other 1 2016
Consumer Confidence Rule Other 1 1999

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 Magnolia-Markridge Park Subdivision.

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 LA1055137 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
2016 Lead and Copper Rule MR 4 SDWIS / LA1055137 / 5000
2016 Revised Total Coliform Rule Other 1 SDWIS / LA1055137 / 8000
2015 Public Notice Other 6 SDWIS / LA1055137 / 7500
2015 Chlorine MR 4 SDWIS / LA1055137 / 0999
2013 TTHM MR 8 SDWIS / LA1055137 / 2950
2013 Total Haloacetic Acids (HAA5) MR 8 SDWIS / LA1055137 / 2456
2013 Coliform (TCR) MR 3 SDWIS / LA1055137 / 3100
2013 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 2 SDWIS / LA1055137 / 0600
2011 Groundwater Rule TT 2 SDWIS / LA1055137 / 0700
2002 Coliform (TCR) MCL 3 SDWIS / LA1055137 / 3100
1999 Consumer Confidence Rule Other 1 SDWIS / LA1055137 / 7000

How Magnolia-Markridge Park Subdivision Compares

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

Metric Magnolia-Markridge Park Subdivision Louisiana avg Federal benchmark
Total violations 46 93.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 5 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 468 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 Magnolia-Markridge Park Subdivision water safe to drink? ▼
Magnolia-Markridge Park Subdivision (PWS ID: LA1055137) has 46 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 468 people using Groundwater sources.
How many people does Magnolia-Markridge Park Subdivision serve? ▼
Magnolia-Markridge Park Subdivision serves 468 people in Des Peres, Louisiana. It is a Private-owned system using Groundwater water sources with 156 service connections.
What type of violations does Magnolia-Markridge Park Subdivision have? ▼
Magnolia-Markridge Park Subdivision has 46 total violations: 5 health-based violations (MCL exceedances or treatment failures), 29 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Magnolia-Markridge Park Subdivision water? ▼
No PFAS testing data is available for Magnolia-Markridge Park Subdivision under the EPA's UCMR5 monitoring program.
What water source does Magnolia-Markridge Park Subdivision use? ▼
Magnolia-Markridge Park Subdivision 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.