385 S Illinois Ave, Mansfield, OH 44905 · Richland County · Publicly Owned Treatment Works
Mansfield Wastewater Treatment Plant is a publicly owned wastewater treatment works in Mansfield, Richland County, Ohio treating an average of 10.98 million gallons per day against a permitted design capacity of 24 MGD, serving about 53,150 residents. It discharges under NPDES permit OH0026328 (effective), which expires in March 2030, with 426 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in March 1994.
3 treatment structures and unit processes identified at Mansfield Wastewater Treatment Plant.
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See the full treatment train at Mansfield Wastewater Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Federal civil enforcement cases, compliance inspections and informal actions recorded for Mansfield Wastewater Treatment Plant in EPA's ICIS system.
Latest case · Mar 1994
MANSFIELD - CITY OF
Administrative order · CWA, NPDES Discharge without a Permit · Final Order With Penalty · Penalty $80,000
Source: EPA ECHO, civil enforcement case 05-1992-0091.
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Every action against Mansfield Wastewater Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
1 verified contact for Mansfield Wastewater Treatment Plant, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Mansfield Wastewater Treatment Plant, plus the full compliance history and discharge data.
Mansfield · 5 mi away
0.001 MGD
Lucas · 5 mi away
0.13 MGD
Lexington · 7 mi away
0.67 MGD
Perrysville · 11 mi away
0.00091 MGD
Ashland · 11 mi away
0.0031 MGD
Butler · 11 mi away
0.38 MGD
Perrysville · 13 mi away
0.05 MGD
Ashland · 13 mi away
0.0084 MGD
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 October 26, 2026; facility record last updated April 24, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms