How much wastewater does Preston WWTP treat?

Preston WWTP treats an average of 0.03 MGD and is permitted for a design flow of 0.12 MGD.

What treatment technology does Preston WWTP use?

Klarifi has identified clarifiers, aerated lagoons at the Preston facility.

What is the NPDES permit for Preston WWTP?

The facility discharges under NPDES permit MD0020621, currently effective, expiring January 2030.

Is Preston WWTP in compliance?

Discharge monitoring reports show 27 violations at Preston WWTP in the last three years, 25 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Preston WWTP and how do I contact them?

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

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Preston WWTP

Preston, MD · Caroline County · Publicly Owned Treatment Works

Average flow: 0.03 MGD

Design flow: 0.12 MGD

NPDES permit: MD0020621; Effective

Permit expires: January 2030

Population served: 767; CWNS 2022

Preston WWTP is a publicly owned wastewater treatment works in Preston, Caroline County, Maryland treating an average of 0.03 million gallons per day against a permitted design capacity of 0.12 MGD, serving about 767 residents. Treatment on site includes clarifiers, aerated lagoons. It discharges under NPDES permit MD0020621 (effective), which expires in January 2030, with 27 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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Aerated lagoons

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Compliance snapshot (last 3 years)

Total violations: 27

Effluent violations: 25

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

Key contacts

Decision-makers at Preston WWTP.

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Nearby wastewater treatment plants in Maryland

Federalsburg WWTP

Federalsburg · 7 mi away

0.21 MGD

Easton WWTP

Easton · 7 mi away

2.02 MGD

Twin Cities WWTP

Secretary · 8 mi away

0.13 MGD

Trappe WWTP

Trappe · 9 mi away

0.06 MGD

Denton WWTP

Denton · 13 mi away

0.4 MGD

Oxford WWTP

Oxford · 14 mi away

0.11 MGD

North Caroline High School

Ridgely · 15 mi away

0.002 MGD

Sharptown WWTP

Sharptown · 15 mi away

0.04 MGD

Preston 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 28, 2025.

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