HEMLOCK HILLS MHP
NPDES ID: PA0239771
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
March 31, 2026
Nitrogen, ammonia total [as N]
71% over limit
Discharged 12.8 mg/L against a permitted limit of 7.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 254 MPN/100mL against a permitted limit of 2000 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
34% over limit
Discharged 10.02 mg/L against a permitted limit of 7.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
45% over limit
Discharged 10.9 mg/L against a permitted limit of 7.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
119% over limit
Discharged 54.8 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
December 31, 2025
Coliform, fecal general
Limit violation
Discharged 110 MPN/100mL against a permitted limit of 2000 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2400 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 0 MPN/100mL (INST MAX)
DMR, Monitor Only - Overdue
November 30, 2025
Coliform, fecal general
Limit violation
Discharged 49 MPN/100mL against a permitted limit of 2000 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
40% over limit
Discharged 10.5 mg/L against a permitted limit of 7.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
204% over limit
Discharged 7.6 mg/L against a permitted limit of 2.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
88% over limit
Discharged 4.7 mg/L against a permitted limit of 2.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 295 MPN/100mL against a permitted limit of 200 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
228% over limit
Discharged 8.2 mg/L against a permitted limit of 2.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
208% over limit
Discharged 7.7 mg/L against a permitted limit of 2.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
275% over limit
Discharged 749 MPN/100mL against a permitted limit of 200 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
308% over limit
Discharged 10.2 mg/L against a permitted limit of 2.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 49 MPN/100mL against a permitted limit of 200 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
52% over limit
Discharged 3.8 mg/L against a permitted limit of 2.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)