No open health-based violations on EPA record in the last 10 years.
Serves about 3,509 people (1,913 connections) with surface water bought from Rend Lake Inter-City Water System.
From EPA's record for IL1990500. PurityMap is independent of Johnston City.
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1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2024 | Lead and copper rule revisions | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2023 to November 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorobutanoic acid (PFBA) | 5.2 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| 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 | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| 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 | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| 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 | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| 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 | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| 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 | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| 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 | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| 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 | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-20 to 2023-11-07 | UCMR5 Analytical Results: JOHNSTON CITY (IL1990500) |
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 →Johnston City's phone number on EPA record is 618-983-6651. Its mailing address is 100 W. Broadway, JOHNSTON CITY, IL 62951.
According to EPA's record, Johnston City uses surface water bought from Rend Lake Inter-City Water System.
EPA's record shows 1 health-based violation for Johnston City in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. 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 Johnston City's latest lead and copper round, which ended in June 2026, was 7.68 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Johnston City. Its phone number on EPA record is 618-983-6651. Its mailing address on EPA record is 100 W. Broadway, JOHNSTON CITY, IL 62951. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.