No health-based violations on EPA record since 2016.
Serves about 7,140 people (3,188 connections) with groundwater from its own wells, and buys water from Scotland County Cons PWSD 1, Canton PWS and Kahoka Public Works PWS.
From EPA's record for MO2024138. PurityMap is independent of Clark County Cons PWSD 1.
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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 February 2023 to February 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 | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| 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 | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| 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 | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| 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 | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| 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 | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| 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 | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| 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 | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-02-25 | UCMR5 Analytical Results: CLARK COUNTY CONS PWSD 1 (MO2024138) |
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 →Clark County Cons PWSD 1's phone number on EPA record is 573-853-4550. Its mailing address is RR1 BOX 30, WILLIAMSTOWN, MO 63473-0000.
According to EPA's record, Clark County Cons PWSD 1 uses groundwater from its own wells, and buys water from Scotland County Cons PWSD 1, Canton PWS and Kahoka Public Works PWS.
No health-based violations on EPA record since 2016. 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 Clark County Cons PWSD 1's latest lead and copper round, which ended in December 2023, was 2.25 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Clark County Cons PWSD 1. Its phone number on EPA record is 573-853-4550. Its mailing address on EPA record is RR1 BOX 30, WILLIAMSTOWN, MO 63473-0000. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.