What is the address of Mendon WWTP?

The address on the plant’s EPA facility record is N Washington St & Mill St, Mendon, OH 45862, in Mercer County. Its coordinates are 40.6787, -84.5261. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Mendon WWTP treat?

Mendon WWTP is permitted for a design flow of 0.1 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Mendon WWTP use?

Klarifi has identified one treatment structure or unit process at the Mendon facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Mendon WWTP?

The facility discharges under NPDES permit OH0053601, currently effective, expiring October 2029.

Is Mendon WWTP in compliance?

Discharge monitoring reports show 4 violations at Mendon WWTP in the last three years, 4 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Mendon WWTP and how do I contact them?

Mendon WWTP is a publicly owned treatment works in Mendon, Ohio. Klarifi lists decision-maker contacts for this facility, available with a free trial.

Try for free Log in

Mendon WWTP

N Washington St & Mill St, Mendon, OH 45862 · Mercer County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.1 MGD

NPDES permit: OH0053601; Effective

Permit expires: October 2029

Population served: 628; CWNS 2022

Mendon WWTP is a publicly owned wastewater treatment works in Mendon, Mercer County, Ohio, serving about 628 residents. It discharges under NPDES permit OH0053601 (effective), which expires in October 2029, with 4 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Mendon WWTP.

Available with a free Klarifi account

See the full treatment train at Mendon WWTP: structures, unit processes and planned upgrades, with exact unit counts.

Create a free account

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 Mendon WWTP.

No verified contacts on file yet

Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.

Try Klarifi free

Nearby wastewater treatment plants in Ohio

Rockford STP

Rockford · 6 mi away

0.29 MGD

Ohio City WWTP

Ohio City · 7 mi away

0.12 MGD

Odot Rest Area 7-33

St. Marys · 10 mi away

0.0017 MGD

Spencerville WWTP

Spencerville · 10 mi away

0.29 MGD

Celina WWTP

Celina · 10 mi away

2.01 MGD

St Marys City WWTP

Saint Marys · 11 mi away

1.66 MGD

West Jefferson WWTP

Celina · 12 mi away

0.05 MGD

Middle Point WWTP

Middle Point · 13 mi away

0.05 MGD

Mendon 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 October 26, 2026; facility record last updated January 25, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms

Try Klarifi for free

Create your own trial account and explore how Klarifi can help you.

Try for free