Patapsco Wastewater Treatment Plant
Baltimore, MD · Baltimore City County · Publicly Owned Treatment Works
- Average flow
- 49.01 MGD
- Design flow
- —
- NPDES permit
- MDL021601
- Effective
- Permit expires
- December 2030
- Population served
- 293,367
- CWNS 2022
Patapsco Wastewater Treatment Plant is a publicly owned wastewater treatment works in Baltimore, Baltimore City County, Maryland treating an average of 49.01 million gallons per day, serving about 293,367 residents. Treatment on site includes clarifiers, biogas silos, biogas balloons. It discharges under NPDES permit MDL021601 (effective), which expires in December 2030, with 22 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 22
- Effluent violations
- 10
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Baltimore
Baltimore's capital improvement plan lists 212 water, sewer and wastewater line items worth $4.7B starting 2025–2031. The largest budgeted items are shown here.
All water and sewer capital projects in Baltimore →
| Project | Budget | Years |
|---|---|---|
| Future Water Main Replacement | $280,000,000 | 2027–2031 |
| Baltimore St./Smallwood St./Reisterstown Rd. Area Water Main Replacements | $199,868,000 | 2026–2030 |
| OF Hyd Outfall Phase II Sewershed Improvements for 5 Year Storm LOP | $155,083,680 | 2027–2029 |
| (Project 1355) Activated Plant 3 Rehab at BRWWTP | $122,148,822 | 2027–2027 |
| Construction Reserve Meter Replacement | $110,000,000 | 2026–2031 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
7 verified contacts for Patapsco Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 7 verified contacts (4 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Patapsco Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Maryland
Baltimore · 6 mi away
114.1 MGD
Odenton · 15 mi away
0.52 MGD
Perry Hall · 15 mi away
0.05 MGD
Savage · 15 mi away
16.68 MGD
Glen Arm · 16 mi away
—
Annapolis · 17 mi away
3.68 MGD
Laurel · 17 mi away
1.53 MGD
Bowie · 18 mi away
1.4 MGD
Patapsco Wastewater Treatment Plant: 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 September 2, 2025.