6 open health-based violations on EPA record.
Serves about 5,340 people (1,780 connections) with groundwater from its own wells, and buys water from Westlake City of Water System.
From EPA's record for LA1019053. PurityMap is independent of Calcasieu Parish WW District No 4.
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7 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2025 | Groundwater Rule | – | – | Unaddressed |
| From October 2025 | Groundwater Rule | – | – | Unaddressed |
| From October 2025 | Groundwater Rule | – | – | Unaddressed |
| From October 2025 | Groundwater Rule | – | – | Unaddressed |
| From October 2025 | Groundwater Rule | – | – | Unaddressed |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2024 | Lead and copper rule revisions | – | – | Unaddressed |
| From July 2023 | Groundwater Rule | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from May 2024 to December 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 14 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2024-05-22 to 2024-11-20 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-22 to 2024-11-20 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-22 to 2024-11-20 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-22 to 2024-11-20 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-22 to 2024-11-20 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-11-20 to 2024-12-09 | UCMR5 Analytical Results: CALCASIEU PARISH WW DISTRICT NO 4 (LA1019053) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Calcasieu Parish WW District No 4's phone number on EPA record is 337-433-8353. Its mailing address is CALCASIEU PARISH WW DIST #4, P.O. BOX 515, WESTLAKE, LA 70669.
According to EPA's record, Calcasieu Parish WW District No 4 uses groundwater from its own wells, and buys water from Westlake City of Water System.
EPA's record shows 7 health-based violations for Calcasieu Parish WW District No 4 in the 10 years to July 9, 2026. EPA's record lists 6 open health-based violations. EPA also lists 3 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Calcasieu Parish WW District No 4's latest lead and copper round, which ended in December 2024, was 2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Calcasieu Parish WW District No 4. Its phone number on EPA record is 337-433-8353. Its mailing address on EPA record is CALCASIEU PARISH WW DIST #4, P.O. BOX 515, WESTLAKE, LA 70669. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.