UPPER POTOMAC RIVER COMM STP

Address

528 MARYLAND AVENUE
WESTERNPORT, MD 21562
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County

ALLEGANY County

Industry

Utilities

NAICS (North American Industry Classification)

221320

Inspections

13 · last Dec 17, 2025

Total Penalties

$0 · last Mar 1, 2000

Registry ID

110000732887

Compliance Status (Last 12 Quarters)

Number of calendar quarters, out of the last 12, in which this facility was in violation of its permit. Zero means no recorded violations in that program over the past three years.

0

Air (CAA)
Qtrs Non-Compliant

3

Water (CWA)
Qtrs Non-Compliant

0

Hazardous Waste (RCRA)
Qtrs Non-Compliant

Discharge Limit Exceedances

Instances where this facility's reported discharge monitoring results exceeded its permitted limits under the Clean Water Act. Exceedance percentage shows how far over the permit limit the discharge was.

Pollutant	Violation	Reported	Limit	Exceedance	Period	Status
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	5.67 mg/L	4.00	+42%	Jan 2026	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	8.70 mg/L	8.00	+9%	Jan 2026	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	7.32 mg/L	4.00	+83%	Dec 2025	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	10.60 mg/L	8.00	+33%	Dec 2025	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	5.47 mg/L	4.00	+37%	Feb 2025	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	5.32 mg/L	4.00	+33%	Feb 2021	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	4.53 mg/L	4.00	+13%	Jan 2021	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	8.31 mg/L	8.00	+4%	Dec 2020	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	5.14 mg/L	4.00	+29%	Dec 2020	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	10.52 mg/L	8.00	+32%	Nov 2020	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	7.63 mg/L	4.00	+91%	Nov 2020	Open
Solids, total suspended	DMR, Limited - Numeric Violation	130.00 mg/L	110.00	+18%	Jun 2020	Open
pH range excursions, > 60 minutes	DMR, Limited - Numeric Violation	0.03 occur/d	0.00	+2,147,483,650%	Oct 2019	Open
Solids, total suspended	DMR, Limited - Numeric Violation	64.00 mg/L	50.00	+28%	Jul 2019	Open
Solids, total suspended	DMR, Limited - Numeric Violation	136.00 mg/L	110.00	+24%	Jul 2019	Open
Solids, total suspended	DMR, Limited - Numeric Violation	133.00 mg/L	110.00	+21%	Jun 2019	Open
BOD, 5-day, 20 deg. C	DMR, Limited - Numeric Violation	7,658.07 kg/d	7,004.77	+9%	Jan 2019	Open
BOD, 5-day, 20 deg. C	DMR, Limited - Numeric Violation	12,465.93 kg/d	7,004.77	+78%	Jan 2018	Open
BOD, 5-day, 20 deg. C	DMR, Limited - Numeric Violation	189.00 mg/L	100.00	+89%	Jan 2018	Open
Color	DMR, Limited - Numeric Violation	122,022.94 kg/d	63,042.44	+94%	Jan 2018	Open
Nitrogen, total [as N]	DMR, Limited - Numeric Violation	1,154.00 mg/L	4.00	+28,750%	Jul 2016	Open

Enforcement Actions

Formal enforcement cases brought by the EPA or state agencies, including administrative orders and civil penalties assessed. Penalty amounts reflect what was formally assessed, not necessarily what was collected.

State Administrative Order of Consent

Clean Water Act · Case MD-N00000067 · Mar 1, 2000

Civil Judicial Action

Clean Water Act · Case MD-N00000068 · Mar 1, 2000

$9,000

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