FLIGHT 93 NATL MEMORIAL STP
NPDES ID: PA0255009
D — SNC: Discharge monitoring report not received
The facility didn't submit its required discharge monitoring report.
Violations
February 28, 2026
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 4 mg/L (INST MIN)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 1.6 mg/L (INST MAX)
DMR, Limited - Overdue
Coliform, fecal general
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 2000 MPN/100mL (GEO MEAN)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (INST MAX)
DMR, Monitor Only - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 mg/L against a permitted limit of 50 mg/L (INST MAX)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 60 mg/L (INST MAX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 9 SU (INST MAX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6 SU (INST MIN)
DMR, Limited - Overdue
Coliform, fecal general
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Overdue
September 30, 2025
Nitrogen, ammonia total [as N]
61% over limit
Discharged 80.3 mg/L against a permitted limit of 50 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
93% over limit
Discharged 48.2 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
82% over limit
Discharged 45.6 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
9% over limit
Discharged 54.4 mg/L against a permitted limit of 50 mg/L (INST MAX)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
152% over limit
Discharged 126 mg/L against a permitted limit of 50 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
345% over limit
Discharged 111.2 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
278% over limit
Discharged 94.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
96% over limit
Discharged 97.8 mg/L against a permitted limit of 50 mg/L (INST MAX)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
108% over limit
Discharged 104 mg/L against a permitted limit of 50 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
134% over limit
Discharged 58.6 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Oxygen, dissolved [DO]
3% over limit
Discharged 3.9 mg/L against a permitted limit of 4 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
80% over limit
Discharged 89.9 mg/L against a permitted limit of 50 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
249% over limit
Discharged 87.2 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
30% over limit
Discharged 65 mg/L against a permitted limit of 50 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
116% over limit
Discharged 54 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
26% over limit
Discharged 63.2 mg/L against a permitted limit of 50 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
68% over limit
Discharged 41.9 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)