Johnstown WWTP
Johnstown, OH · Licking County · Publicly Owned Treatment Works
- Average flow
- 0.48 MGD
- Design flow
- 1.2 MGD
- NPDES permit
- OH0020508
- Effective
- Permit expires
- February 2030
- Population served
- 5,182
- CWNS 2022
Johnstown WWTP is a publicly owned wastewater treatment works in Johnstown, Licking County, Ohio treating an average of 0.48 million gallons per day against a permitted design capacity of 1.2 MGD, serving about 5,182 residents. Treatment on site includes clarifiers. It discharges under NPDES permit OH0020508 (effective), which expires in February 2030, with 4 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Johnstown WWTP.
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Nearby wastewater treatment plants in Ohio
Galena · 9 mi away
0.0062 MGD
Pataskala · 11 mi away
0.66 MGD
Granville · 11 mi away
0.42 MGD
Sunbury · 11 mi away
0.68 MGD
Westerville · 13 mi away
0.56 MGD
Hebron · 14 mi away
1.87 MGD
Kirkersville · 14 mi away
0.04 MGD
Utica · 14 mi away
0.25 MGD
Johnstown WWTP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated November 27, 2025.