No open health-based violations on EPA record in the last 10 years.
Serves about 5,250 people (1,750 connections) with groundwater from its own wells.
From EPA's record for LA1029007. PurityMap is independent of Monterey Rural Water System Inc.
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2 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From November 2019 | Groundwater Rule | – | – | Resolved |
| From November 2019 | Groundwater Rule | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from May 2025 to November 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 17.4 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 | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| 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 | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| 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 | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| 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 | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| 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 | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| 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 | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| 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 | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-19 to 2025-11-03 | UCMR5 Analytical Results: MONTEREY RURAL WATER SYSTEM INC (LA1029007) |
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 →Monterey Rural Water System Inc's phone number on EPA record is 318-386-2232. Its mailing address is MONTEREY RURAL WATER SYSTEM, P.O. Box 157, MONTEREY, LA 71354.
According to EPA's record, Monterey Rural Water System Inc uses groundwater from its own wells.
EPA's record shows 2 health-based violations for Monterey Rural Water System Inc in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. EPA also lists 1 missed or late test or report in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Monterey Rural Water System Inc's latest lead and copper round, which ended in December 2025, was 9.3 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Monterey Rural Water System Inc. Its phone number on EPA record is 318-386-2232. Its mailing address on EPA record is MONTEREY RURAL WATER SYSTEM, P.O. Box 157, MONTEREY, LA 71354. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.