Conococheague WWTP
16232 Elliott Parkway, Williamsport, MD 21795 · Washington County · Publicly Owned Treatment Works
- Average flow
- 2.26 MGD
- Design flow
- 4.1 MGD
- NPDES permit
- MD0063509
- Effective
- Permit expires
- May 2031
- Population served
- 12,180
- CWNS 2022
Conococheague WWTP is a publicly owned wastewater treatment works in Williamsport, Washington County, Maryland treating an average of 2.26 million gallons per day against a permitted design capacity of 4.1 MGD, serving about 12,180 residents. It discharges under NPDES permit MD0063509 (effective), which expires in May 2031, with 0 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Conococheague WWTP.
Available with a free Klarifi account
See the full treatment train at Conococheague WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Conococheague WWTP.
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Nearby wastewater treatment plants in Maryland
Funkstown · 5 mi away
0.05 MGD
Clear Spring · 7 mi away
0.12 MGD
Hagerstown · 8 mi away
0.0041 MGD
Boonsboro · 11 mi away
0.28 MGD
Boonsboro · 11 mi away
0.0091 MGD
Smithsburg · 12 mi away
0.22 MGD
Sharpsburg · 13 mi away
0.11 MGD
Myersville · 13 mi away
0.01 MGD
Conococheague 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 May 19, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms