Total trihalomethanes (TTHM) above the legal limit in the period starting October 2025.
Serves about 6,656 people (2,207 connections) with groundwater from its own wells.
From EPA's record for OH0501214. PurityMap is independent of Nelsonville PWS.
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13 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Oct–Dec 2025 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Archived |
| Jul–Sep 2025 | Total trihalomethanes (TTHM) | 0.091 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2025 | Total trihalomethanes (TTHM) | 0.1 mg/L | 0.080 mg/L | Archived |
| Jan–Mar 2025 | Total trihalomethanes (TTHM) | 0.104 mg/L | 0.080 mg/L | Archived |
| Oct–Dec 2024 | Total trihalomethanes (TTHM) | 0.099 mg/L | 0.080 mg/L | Archived |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jul–Sep 2024 | Total trihalomethanes (TTHM) | 0.102 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2024 | Total trihalomethanes (TTHM) | 0.089 mg/L | 0.080 mg/L | Archived |
| Jan–Mar 2024 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2022 | Total trihalomethanes (TTHM) | 0.086 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2020 | Total trihalomethanes (TTHM) | 0.093 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2019 | Total trihalomethanes (TTHM) | 0.082 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2019 | Total trihalomethanes (TTHM) | 0.086 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2018 | Total trihalomethanes (TTHM) | 0.086 mg/L | 0.080 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2025 to August 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 15 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| 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 | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| 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 | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| 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 | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| 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 | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| 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 | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| 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 | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-20 | UCMR5 Analytical Results: NELSONVILLE PWS (OH0501214) |
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.
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Follow this water →According to EPA's record, Nelsonville PWS uses groundwater from its own wells.
EPA's record shows 13 health-based violations for Nelsonville PWS in the 10 years to July 9, 2026. Total trihalomethanes (TTHM) were above the legal limit in the period starting October 2025. EPA also lists 8 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Nelsonville PWS's latest lead and copper round, which ended in December 2025, was 1.6 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Nelsonville PWS. Its mailing address on EPA record is 211 LAKE HOPE DR., NELSONVILLE, OH 45764. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.