REARDAN STP
NPDES ID: WA0045306
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: 6 effluent violations, 10 reporting violations.
Violations
June 30, 2026
Nitrogen, ammonia total [as N]
117% over limit
Discharged 6.5 mg/L against a permitted limit of 3 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
225% over limit
Discharged 6.5 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2026
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (AVERAGE)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (AVERAGE)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MAXIMUM)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (AVERAGE)
DMR, Monitor Only - Overdue
Flow
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MAXIMUM)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MAXIMUM)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MAXIMUM)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (AVERAGE)
DMR, Monitor Only - Overdue
Flow
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (AVERAGE)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 9.8 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
68% over limit
Discharged 5.03 mg/L against a permitted limit of 3 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MAXIMUM)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
72% over limit
Discharged 3.43 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Coliform, fecal general
93% over limit
Discharged 96.5 MPN/100mL against a permitted limit of 50 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
70% over limit
Discharged 170 MPN/100mL against a permitted limit of 100 MPN/100mL (WKLY AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Coliform, fecal general
30% over limit
Discharged 130 MPN/100mL against a permitted limit of 100 MPN/100mL (WKLY AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
23% over limit
Discharged 61.6 MPN/100mL against a permitted limit of 50 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
45% over limit
Discharged 2.9 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
8% over limit
Discharged 2.16 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
23% over limit
Discharged 3.68 mg/L against a permitted limit of 3 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
37% over limit
Discharged 2.73 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
84% over limit
Discharged 3.68 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
1500% over limit
Discharged 1600 MPN/100mL against a permitted limit of 100 MPN/100mL (WKLY AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
563% over limit
Discharged 331.4 MPN/100mL against a permitted limit of 50 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
51% over limit
Discharged 4.53 mg/L against a permitted limit of 3 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
410% over limit
Discharged 10.2 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
169% over limit
Discharged 8.06 mg/L against a permitted limit of 3 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
92% over limit
Discharged 3.84 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
79% over limit
Discharged 5.36 mg/L against a permitted limit of 3 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
March 31, 2025
Coliform, fecal general
70% over limit
Discharged 170 MPN/100mL against a permitted limit of 100 MPN/100mL (WKLY AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
20% over limit
Discharged 59.8 MPN/100mL against a permitted limit of 50 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Coliform, fecal general
97% over limit
Discharged 98.5 MPN/100mL against a permitted limit of 50 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
43% over limit
Discharged 12.2579999 kg/d against a permitted limit of 8.58059993 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
70% over limit
Discharged 21.88279982 kg/d against a permitted limit of 12.84819989 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
250% over limit
Discharged 350 MPN/100mL against a permitted limit of 100 MPN/100mL (WKLY AVG)
DMR, Limited - Numeric Violation
December 31, 2024
BOD, carbonaceous [5 day, 20 C]
68% over limit
Discharged 21.61039982 kg/d against a permitted limit of 12.84819989 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
12% over limit
Discharged 56 MPN/100mL against a permitted limit of 50 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
7% over limit
Discharged 10.7 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
6% over limit
Discharged 15.9 mg/L against a permitted limit of 15 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
32% over limit
Discharged 11.30459991 kg/d against a permitted limit of 8.58059993 kg/d (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Coliform, fecal general
6% over limit
Discharged 53.2 MPN/100mL against a permitted limit of 50 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
70% over limit
Discharged 170 MPN/100mL against a permitted limit of 100 MPN/100mL (WKLY AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Phosphorus, total [as P]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MAXIMUM)
DMR, Monitor Only - Overdue
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MAXIMUM)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
12% over limit
Discharged 2.24 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
18% over limit
Discharged 2.36 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (10 hours ago)