Total trihalomethanes (TTHM) above the legal limit in the period starting January 2026.
Serves about 4,968 people (1,996 connections) with surface water bought from Lathrop PWS, Plattsburg PWS and Clinton County PWSD 4 Sys 2.
From EPA's record for MO1024156. PurityMap is independent of Clinton Co PWSD 4 Sys 1.
Are you this utility? Correct this listing →
2 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2026 | Total trihalomethanes (TTHM) | 81 µg/L | 0.080 mg/L | Archived |
| Oct–Dec 2025 | Total trihalomethanes (TTHM) | 81.8 µg/L | 0.080 mg/L | Archived |
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2025 to September 2025.
| 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 | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| 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 | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| 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 | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| 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 | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| 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 | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| 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 | 2025-02-11 to 2025-08-12 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| 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 | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-11 to 2025-09-23 | UCMR5 Analytical Results: CLINTON CO PWSD 4 SYS 1 (MO1024156) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure
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 →Clinton Co PWSD 4 Sys 1's phone number on EPA record is 816-580-7211. Its mailing address is 8544 SE V HWY, LATHROP, MO 64465-0000.
According to EPA's record, Clinton Co PWSD 4 Sys 1 uses surface water bought from Lathrop PWS, Plattsburg PWS and Clinton County PWSD 4 Sys 2.
EPA's record shows 2 health-based violations for Clinton Co PWSD 4 Sys 1 in the 10 years to July 9, 2026. Total trihalomethanes (TTHM) were above the legal limit in the period starting January 2026. EPA also lists 5 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Clinton Co PWSD 4 Sys 1's latest lead and copper round, which ended in December 2024, was 2.01 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Clinton Co PWSD 4 Sys 1. Its phone number on EPA record is 816-580-7211. Its mailing address on EPA record is 8544 SE V HWY, LATHROP, MO 64465-0000. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.