Twin Cities WWTP
Secretary, MD · Dorchester County · Publicly Owned Treatment Works
- Average flow
- 0.13 MGD
- Design flow
- 0.28 MGD
- NPDES permit
- MD0055352
- Effective
- Permit expires
- September 2028
- Population served
- 1,074
- CWNS 2022
Twin Cities WWTP is a publicly owned wastewater treatment works in Secretary, Dorchester County, Maryland treating an average of 0.13 million gallons per day against a permitted design capacity of 0.28 MGD, serving about 1,074 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit MD0055352 (effective), which expires in September 2028, with 58 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 58
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Twin Cities WWTP.
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Nearby wastewater treatment plants in Maryland
Trappe · 7 mi away
0.06 MGD
Preston · 8 mi away
0.03 MGD
Easton · 11 mi away
2.02 MGD
Vienna · 11 mi away
0.05 MGD
Federalsburg · 12 mi away
0.21 MGD
Oxford · 12 mi away
0.11 MGD
Sharptown · 14 mi away
0.04 MGD
Saint Michaels · 18 mi away
0.29 MGD
Twin Cities 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 6, 2025.