What is the address of Rockford STP?

The address on the plant’s EPA facility record is 142 North Main Street State Routes 117 & 118, Rockford, OH 45882, in Mercer County. Its coordinates are 40.6977, -84.6428. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Rockford STP treat?

Rockford STP treats an average of 0.29 MGD and is permitted for a design flow of 0.45 MGD.

What treatment technology does Rockford STP use?

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

What is the NPDES permit for Rockford STP?

The facility discharges under NPDES permit OH0022446, currently effective, expiring June 2027.

Is Rockford STP in compliance?

Discharge monitoring reports show 12 violations at Rockford STP in the last three years, 12 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Rockford STP and how do I contact them?

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

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Rockford STP

142 North Main Street State Routes 117 & 118, Rockford, OH 45882 · Mercer County · Publicly Owned Treatment Works

Average flow: 0.29 MGD

Design flow: 0.45 MGD

NPDES permit: OH0022446; Effective

Permit expires: June 2027

Population served: 1,051; CWNS 2022

Rockford STP is a publicly owned wastewater treatment works in Rockford, Mercer County, Ohio treating an average of 0.29 million gallons per day against a permitted design capacity of 0.45 MGD, serving about 1,051 residents. It discharges under NPDES permit OH0022446 (effective), which expires in June 2027, with 12 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Rockford STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 12

Effluent violations: 12

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

Key contacts

Decision-makers at Rockford STP.

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Nearby wastewater treatment plants in Ohio

Ohio City WWTP

Ohio City · 5 mi away

0.12 MGD

Mendon WWTP

Mendon · 6 mi away

—

Willshire WWTP

Willshire · 9 mi away

—

West Jefferson WWTP

Celina · 11 mi away

0.05 MGD

Celina WWTP

Celina · 12 mi away

2.01 MGD

Van Wert WWTP

Van Wert · 14 mi away

2.44 MGD

Coldwater WWTP

Coldwater · 14 mi away

1.13 MGD

Odot Rest Area 7-33

St. Marys · 15 mi away

0.0017 MGD

Rockford STP: 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 August 11, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms

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