Community Water System · PWS LA1099009
United Water System
Arnaudville, Louisiana 70512 - drinking water served from groundwater sources to 4,446 people, tracked in EPA SDWIS and UCMR5.
- 4,446
- People served
- 209
- EPA violations
- 175
- Health-based
- No PFAS
- UCMR5 result
The verdict
EPA records 209 drinking-water violations at United Water System, 84% of them health-based - above the Louisiana per-system average.
- 209
- Total EPA violations on record
- 84%
- Health-based (MCL / treatment failure)
- 4,446
- People served by this system
- 0
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: United Water System
United Water System is a private-owned community water system that delivers drinking water to 4,446 residents in Arnaudville, Louisiana (St. Martin Parish County) through 1,482 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 209 total violations for this system , of which 175 (84%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 14 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 Arsenic, recorded in 149 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.
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%).
United Water System's 209 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.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 1,482
- County
- St. Martin Parish
- School/Daycare
- No
- MCL Violations
- 160
- Monitoring Violations
- 14
- Treatment Tech Violations
- 15
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 149 | 2022 |
| Groundwater Rule | TT | 12 | 2022 |
| Coliform (TCR) | MCL | 11 | 2008 |
| Lead and Copper Rule | MR | 10 | 2021 |
| Consumer Confidence Rule | Other | 9 | 2016 |
| Public Notice | Other | 6 | 2017 |
| Coliform (TCR) | MR | 4 | 2013 |
| Lead and Copper Rule | TT | 3 | 2017 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NFDHA | 8/7/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFBA | 8/7/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 8/7/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/7/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 8/7/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/7/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 8/7/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/7/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/7/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 8/7/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/7/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 8/7/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 8/7/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 8/7/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 8/7/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFDoA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/7/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 8/7/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| HFPO-DA | 2/3/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 2/3/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 2/3/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 2/3/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 2/3/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 2/3/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 2/3/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 2/3/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 2/3/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 2/3/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 2/3/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 2/3/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 2/3/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| ADONA | 2/3/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 2/3/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 2/3/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| 6:2 FTS | 2/3/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 2/3/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 2/3/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 2/3/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 2/3/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
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 United Water System.
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 LA1099009 on SDWISSource: EPA SDWIS Federal Reports Search
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 SDWISViolation 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 | Arsenic | MCL | 149 | SDWIS / LA1099009 / 1005 |
| 2022 | Groundwater Rule | TT | 12 | SDWIS / LA1099009 / 0700 |
| 2021 | Lead and Copper Rule | MR | 10 | SDWIS / LA1099009 / 5000 |
| 2017 | Public Notice | Other | 6 | SDWIS / LA1099009 / 7500 |
| 2017 | Lead and Copper Rule | TT | 3 | SDWIS / LA1099009 / 5000 |
| 2016 | Consumer Confidence Rule | Other | 9 | SDWIS / LA1099009 / 7000 |
| 2013 | Coliform (TCR) | MR | 4 | SDWIS / LA1099009 / 3100 |
| 2008 | Coliform (TCR) | MCL | 11 | SDWIS / LA1099009 / 3100 |
How United Water System Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | United Water System | Louisiana avg | Federal benchmark |
|---|---|---|---|
| Total violations | 209 | 93.2 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 175 | 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 | 4,446 | 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 United Water System water safe to drink? ▼
How many people does United Water System serve? ▼
What type of violations does United Water System have? ▼
Has PFAS been detected in United Water System water? ▼
What water source does United Water System use? ▼
Where does this data come from? ▼
Read our methodology - how this data is sourced, computed, and verified.
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.