MORRISVILLE BOROUGH STP
NPDES ID: PA0026701
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
February 28, 2026
Nitrogen, ammonia total [as N]
9% over limit
Discharged 21.8 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
6% over limit
Discharged 21.15 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
15% over limit
Discharged 23.04 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, ammonia total [as N]
46% over limit
Discharged 29.12 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
BOD, carbonaceous [5 day, 20 C]
36% over limit
Discharged 45 mg/L against a permitted limit of 33 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
41% over limit
Discharged 31 mg/L against a permitted limit of 22 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
55% over limit
Discharged 30.94 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carb-5 day, 20 deg C, percent removal
16% over limit
Discharged 86.62 % against a permitted limit of 88.5 % (MO AV MN)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
44% over limit
Discharged 28.8 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
23% over limit
Discharged 24.62 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
4% over limit
Discharged 20.71 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
15% over limit
Discharged 22.92 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
7% over limit
Discharged 21.4 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
24% over limit
Discharged 24.87 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, ammonia total [as N]
13% over limit
Discharged 22.63 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Oxygen, dissolved [DO]
10% over limit
Discharged 4.5 mg/L against a permitted limit of 5 mg/L (INST MIN)
DMR, Limited - Numeric Violation
July 31, 2024
Nitrogen, ammonia total [as N]
9% over limit
Discharged 21.82 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)