No health-based violations on EPA record since 2016.
Serves about 17,000 people (8,245 connections) with surface water bought from Mo American St Louis St Charles Counties.
From EPA's record for MO6024294. PurityMap is independent of Jefferson County PWSD 3.
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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 March 2024 to December 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| 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 | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| 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 | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| 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 | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| 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 | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| 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 | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| 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 | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| 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 | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-19 to 2024-12-09 | UCMR5 Analytical Results: JEFFERSON COUNTY PWSD 3 (MO6024294) |
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 →Jefferson County PWSD 3's phone number on EPA record is 636-296-7053. Its mailing address is 1469 OLD HWY 21, PO BOX 920, ARNOLD, MO 63010-0000.
According to EPA's record, Jefferson County PWSD 3 uses surface water bought from Mo American St Louis St Charles Counties.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Jefferson County PWSD 3's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for Jefferson County PWSD 3. Its phone number on EPA record is 636-296-7053. Its mailing address on EPA record is 1469 OLD HWY 21, PO BOX 920, ARNOLD, MO 63010-0000. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.