FEATHER NEST MHP STP
NPDES ID: PA0204625
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: 5 effluent violations, 1 single-event violation.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
53% over limit
Discharged 4.44 mg/L against a permitted limit of 2.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
11% over limit
Discharged 222 MPN/100mL against a permitted limit of 200 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Coliform, fecal general
883% over limit
Discharged 9832 MPN/100mL against a permitted limit of 1000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
14% over limit
Discharged 6.7 mg/L against a permitted limit of 5.9 mg/L (INST MAX)
DMR, Limited - Numeric Violation
April 30, 2026
Coliform, fecal general
21% over limit
Discharged 12100 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
51% over limit
Discharged 13 mg/L against a permitted limit of 8.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
52% over limit
Discharged 13.038 mg/L against a permitted limit of 8.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
46% over limit
Discharged 25.1 mg/L against a permitted limit of 17.2 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Coliform, fecal general
21% over limit
Discharged 12100 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
237% over limit
Discharged 58 mg/L against a permitted limit of 17.2 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
242% over limit
Discharged 29.38 mg/L against a permitted limit of 8.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
213% over limit
Discharged 53.8 mg/L against a permitted limit of 17.2 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
480% over limit
Discharged 49.9 mg/L against a permitted limit of 8.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
36% over limit
Discharged 2729 MPN/100mL against a permitted limit of 2000 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
October 31, 2025
Chlorine, total residual
41% over limit
Discharged 0.31 mg/L against a permitted limit of 0.22 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
111% over limit
Discharged 6.11 mg/L against a permitted limit of 2.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
78% over limit
Discharged 10.5 mg/L against a permitted limit of 5.9 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Chlorine, total residual
250% over limit
Discharged 0.21 mg/L against a permitted limit of 0.06 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
693% over limit
Discharged 46.8 mg/L against a permitted limit of 5.9 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1110% over limit
Discharged 35.1 mg/L against a permitted limit of 2.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
BOD, carbonaceous [5 day, 20 C]
158% over limit
Discharged 129 mg/L against a permitted limit of 50 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
832% over limit
Discharged 55 mg/L against a permitted limit of 5.9 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Coliform, fecal general
2606% over limit
Discharged 5411 MPN/100mL against a permitted limit of 200 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1731% over limit
Discharged 53.1 mg/L against a permitted limit of 2.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
1110% over limit
Discharged 12100 MPN/100mL against a permitted limit of 1000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
Solids, total suspended
82% over limit
Discharged 54.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
245% over limit
Discharged 86.2 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
783% over limit
Discharged 25.6 mg/L against a permitted limit of 2.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
369% over limit
Discharged 27.7 mg/L against a permitted limit of 5.9 mg/L (INST MAX)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
59% over limit
Discharged 4.61 mg/L against a permitted limit of 2.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
23% over limit
Discharged 7.26 mg/L against a permitted limit of 5.9 mg/L (INST MAX)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
283% over limit
Discharged 22.6 mg/L against a permitted limit of 5.9 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
583% over limit
Discharged 19.8 mg/L against a permitted limit of 2.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
105% over limit
Discharged 2053 MPN/100mL against a permitted limit of 1000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
100% over limit
Discharged 17.2 mg/L against a permitted limit of 8.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2% over limit
Discharged 17.6 mg/L against a permitted limit of 17.2 mg/L (INST MAX)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
217% over limit
Discharged 54.6 mg/L against a permitted limit of 17.2 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
220% over limit
Discharged 27.5 mg/L against a permitted limit of 8.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
21% over limit
Discharged 12100 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
Coliform, fecal general
196% over limit
Discharged 5921 MPN/100mL against a permitted limit of 2000 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)