Public water system record
Nelsonville PWS
Serves Nelsonville, Athens County, OH · 6,656 people served
Federal records show 13 health-based violations and 8 monitoring/reporting issues for Nelsonville PWS in the last ten years. The most serious issue in this window was a Total Trihalomethanes (TTHMs) violation that EPA lists as archived, not resolved.
System profile
- Health-based violations, last 10 years
- 13
- Resolved
- 5
- Unresolved
- 0
- Archived by EPA
- 8
- Any acute record
- No
- Monitoring issues, last 10 years
- 8
Key facts
- Nelsonville PWS draws water from 3 wells.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.104 mg/L, federal limit 0.08 mg/L (1.3 times the limit), 2025.
- Most recent formal enforcement: compliance order (no penalty) by Ohio, April 2025.
- Record on file since 1985, with 10 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 2,294 unknown out of 2,675 service lines.
Check whether Nelsonville PWS serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
220 | Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Apr 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.104 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Jan 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.099 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Oct 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.102 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Jul 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Apr 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
220 | Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Apr 1, 2022 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Jul 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
220 | Apr 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jan 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Oct 1, 2018 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Nov 5, 2025 | Active |
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Jul 2, 2025 | Active |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jul 1, 2025 | Active |
|
Public Notice
OTHER
|
Jul 1, 2025 | Active |
|
Consumer Confidence Rule
OTHER
|
Jan 25, 2024 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Aug 17, 2022 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Dec 13, 2018 | Resolved |
Full record since 1985
EPA's records for Nelsonville PWS go back to 1985. Before October 19, 2016 they list 10 health-based violations (10 resolved) and 116 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 13 |
| 1990s | 7 | 95 |
| 2000s | 0 | 7 |
| 2010 to October 18, 2016 | 3 | 1 |
| October 19, 2016 to 2019 | 3 | 1 |
| 2020s | 10 | 7 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began April 2016, Resolved.
Show all 10 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Apr 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.083 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
Oct 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 2010 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 1997 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Sep 1, 1997 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 1994 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 1993 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 1993 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 1993 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 1993 | Resolved |
Enforcement actions
Ohio regulators took 2 formal enforcement actions against Nelsonville PWS between 1995 and 2025. The most recent was a compliance order (no penalty) in April 2025.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Apr 8, 2025 | Ohio | Compliance order (no penalty) | 11 violations (9 health-based): Total Trihalomethanes (TTHMs), Consumer Confidence Rule |
| Nov 1, 1995 | Ohio | Compliance order (no penalty) | 5 violations (5 health-based): Surface Water Treatment Rule |
What the violations mean
Total Trihalomethanes (TTHMs)
13 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
Nelsonville PWS draws water from 3 wells.
Annual water quality report
Nelsonville PWS must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Ohio.
Certified drinking water labs by state EPA guidance for private wells