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Mansfield Wastewater Treatment Plant

385 S Illinois Ave, Mansfield, OH 44905 · Richland County · Publicly Owned Treatment Works

Average flow
10.98 MGD
Design flow
24 MGD
NPDES permit
OH0026328
Effective
Permit expires
March 2030
Population served
53,150
CWNS 2022

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.

Treatment technology

3 treatment structures and unit processes identified at Mansfield Wastewater Treatment Plant.

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Compliance snapshot (last 3 years)

Total violations
426
Effluent violations
26

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

EPA enforcement history

Federal civil enforcement cases, compliance inspections and informal actions recorded for Mansfield Wastewater Treatment Plant in EPA's ICIS system.

Formal actions
1
0 since FY2020
Penalties assessed
$80,000
all cases
EPA inspections
0
none on record

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.

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Key contacts

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.

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Lexington WWTP

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Butler WWTP

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Perrysville WWTP

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Mansfield Wastewater Treatment Plant: 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 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


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