BIG BOULDER WWTP
NPDES ID: PA0061182
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
This quarter: 1 effluent violation.
Violations
April 30, 2026
BOD, carbonaceous [5 day, 20 C]
85% over limit
Discharged 46.3 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, carbonaceous [5 day, 20 C]
78% over limit
Discharged 44.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
113% over limit
Discharged 1.066 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, carbonaceous [5 day, 20 C]
46% over limit
Discharged 36.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
pH
0% over limit
Discharged 9.01 SU against a permitted limit of 9 SU (INST MAX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
114% over limit
Discharged 53.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Chlorine, total residual
343% over limit
Discharged 3.1 mg/L against a permitted limit of 0.7 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Chlorine, total residual
5% over limit
Discharged 0.22 mg/L against a permitted limit of 0.21 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
157% over limit
Discharged 64.3 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
BOD, carbonaceous [5 day, 20 C]
155% over limit
Discharged 63.8 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Phosphorus, total [as P]
7% over limit
Discharged 0.536 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
pH
0% over limit
Discharged 4.38 SU against a permitted limit of 6 SU (INST MIN)
DMR, Limited - Numeric Violation
June 30, 2025
BOD, carbonaceous [5 day, 20 C]
60% over limit
Discharged 39.9 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Chlorine, total residual
4% over limit
Discharged 0.73 mg/L against a permitted limit of 0.7 mg/L (INST MAX)
DMR, Limited - Numeric Violation
September 30, 2024
pH
0% over limit
Discharged 9.41 SU against a permitted limit of 9 SU (INST MAX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 5.3 SU against a permitted limit of 6 SU (INST MIN)
DMR, Limited - Numeric Violation
Chlorine, total residual
214% over limit
Discharged 2.2 mg/L against a permitted limit of 0.7 mg/L (INST MAX)
DMR, Limited - Numeric Violation
August 31, 2024
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - 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
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 25.56019979 kg/d (MO AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 2.54239998 kg/d (MO AVG)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.42676 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 kg/d against a permitted limit of 21.29259982 kg/d (MO AVG)
DMR, Limited - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)