No health-based violations on EPA record since 2016.
Serves about 9,657 people (3,219 connections) with groundwater from its own wells, and buys water from Paris and Marshall.
From EPA's record for IL0230010. PurityMap is independent of Clark-Edgar RWD.
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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 June 2023 to December 2023.
| 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 | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| 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 | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| 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 | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| 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 | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| 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 | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| 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 | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| 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 | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-05 to 2023-12-04 | UCMR5 Analytical Results: CLARK-EDGAR RWD (IL0230010) |
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-Edgar RWD's phone number on EPA record is 217-463-5888. Its mailing address is 475 ILLINOIS HIGHWAY 1, MARSHALL, IL 62441.
According to EPA's record, Clark-Edgar RWD uses groundwater from its own wells, and buys water from Paris and Marshall.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Clark-Edgar RWD's latest lead and copper round, which ended in December 2025, was 2.5 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Clark-Edgar RWD. Its phone number on EPA record is 217-463-5888. Its mailing address on EPA record is 475 ILLINOIS HIGHWAY 1, MARSHALL, IL 62441. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.