UPTON WWTP
NPDES ID: MAG580034
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
February 28, 2026
Nitrogen, ammonia total [as N]
174% over limit
Discharged 12.05 mg/L against a permitted limit of 4.4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
377% over limit
Discharged 21 mg/L against a permitted limit of 4.4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
E. coli
538% over limit
Discharged 804 MPN/100mL against a permitted limit of 126 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
E. coli
487% over limit
Discharged 2400 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
E. coli
218% over limit
Discharged 1300 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
167% over limit
Discharged 3.74 mg/L against a permitted limit of 1.4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
214% over limit
Discharged 395.75 MPN/100mL against a permitted limit of 126 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
E. coli
27% over limit
Discharged 520 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
E. coli
0% over limit
Discharged 410 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
110% over limit
Discharged 0.21 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrite + Nitrate total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrite + Nitrate total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
September 30, 2024
NOEC Static Renewal 7Day Chronic Ceriodaphnia dubia
Limit violation
Discharged 6.25 % against a permitted limit of 98 % (MO AV MN)
DMR, Limited - Numeric Violation
Carbon, dissolved organic [as C]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)