No health-based violations on EPA record since 2016.
Serves about 4,700 people (1,670 connections) with groundwater from its own wells.
From EPA's record for MO6010708. PurityMap is independent of St Clair PWS.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from April 2023 to January 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorohexanesulfonic acid (PFHxS) | 5.6 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| 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 | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| 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 | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| 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 | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| 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 | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| 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 | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-04-04 to 2023-10-16 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2023-10-16 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2023-10-16 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| 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 | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2023-10-16 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2023-10-16 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-04 to 2024-01-08 | UCMR5 Analytical Results: ST CLAIR PWS (MO6010708) |
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 →St Clair PWS's phone number on EPA record is 636-629-0333. Its mailing address is 1 PAUL PARKS, ST CLAIR, MO 63077-0000.
According to EPA's record, St Clair PWS uses groundwater from its own wells.
No health-based violations on EPA record since 2016. EPA also lists 2 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in St Clair PWS's latest lead and copper round, which ended in December 2025, was 2.38 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for St Clair PWS. Its phone number on EPA record is 636-629-0333. Its mailing address on EPA record is 1 PAUL PARKS, ST CLAIR, MO 63077-0000. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.