Haloacetic acids (HAA5) above the legal limit in the period starting January 2026.
Serves about 2,500 people (1,200 connections) with surface water from its own intake.
From EPA's record for MO2010538. PurityMap is independent of Monroe City PWS.
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25 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2026 | Haloacetic acids (HAA5) | 81 µg/L | 0.060 mg/L | Archived |
| Jan–Mar 2026 | Total trihalomethanes (TTHM) | 121 µg/L | 0.080 mg/L | Archived |
| Oct–Dec 2025 | Haloacetic acids (HAA5) | 78.4 µg/L | 0.060 mg/L | Archived |
| Oct–Dec 2025 | Total trihalomethanes (TTHM) | 123.4 µg/L | 0.080 mg/L | Archived |
| Jul–Sep 2025 | Haloacetic acids (HAA5) | 65.03 µg/L | 0.060 mg/L | Archived |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jul–Sep 2025 | Total trihalomethanes (TTHM) | 114.5 µg/L | 0.080 mg/L | Archived |
| Apr–Jun 2025 | Total trihalomethanes (TTHM) | 106 µg/L | 0.080 mg/L | Archived |
| Jan–Mar 2025 | Total trihalomethanes (TTHM) | 93 µg/L | 0.080 mg/L | Archived |
| Oct–Dec 2024 | Total trihalomethanes (TTHM) | 85.4 µg/L | 0.080 mg/L | Archived |
| Jul–Sep 2024 | Total trihalomethanes (TTHM) | 90 µg/L | 0.080 mg/L | Archived |
| Apr–Jun 2024 | Total trihalomethanes (TTHM) | 84.6 µg/L | 0.080 mg/L | Archived |
| Oct–Dec 2023 | Total trihalomethanes (TTHM) | 80.6 µg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2023 | Total trihalomethanes (TTHM) | 84.5 µg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2022 | Total trihalomethanes (TTHM) | 81 µg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2021 | Total trihalomethanes (TTHM) | 82 µg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2020 | Total trihalomethanes (TTHM) | 92 µg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2019 | Total trihalomethanes (TTHM) | 98 µg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2019 | Total trihalomethanes (TTHM) | 122 µg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2019 | Total trihalomethanes (TTHM) | 127 µg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2019 | Total trihalomethanes (TTHM) | 92 µg/L | 0.080 mg/L | Resolved |
| From June 2018 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From May 2018 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From December 2017 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From August 2016 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
| From August 2016 | Interim Enhanced Surface Water Treatment Rule | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from March 2023 to December 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorobutanoic acid (PFBA) | 5.4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| 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 | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| 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 | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| 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 | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| 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 | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| 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 | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| 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 | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| 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 | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-18 | UCMR5 Analytical Results: MONROE CITY PWS (MO2010538) |
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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.
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Follow this water →Monroe City PWS's phone number on EPA record is 573-735-4585. Its mailing address is PO BOX 67, MONROE, MO 63456-0000.
According to EPA's record, Monroe City PWS uses surface water from its own intake.
EPA's record shows 25 health-based violations for Monroe City PWS in the 10 years to July 9, 2026. Haloacetic acids (HAA5) were above the legal limit in the period starting January 2026. EPA also lists 13 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Monroe City PWS's latest lead and copper round, which ended in June 2026. The federal action level is 15 µg/L.
PurityMap has no verified website for Monroe City PWS. Its phone number on EPA record is 573-735-4585. Its mailing address on EPA record is PO BOX 67, MONROE, MO 63456-0000. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.