SPRING GROVE WWTP
NPDES ID: MN0021440
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.
Violations
June 30, 2026
Solids, suspended percent removal
40% over limit
Discharged 79 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
May 31, 2026
Solids, total suspended
9% over limit
Discharged 49 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
246% over limit
Discharged 222.6 kg/d against a permitted limit of 64.3 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
69% over limit
Discharged 60.2 kg/d against a permitted limit of 35.7 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
171% over limit
Discharged 116.2 kg/d against a permitted limit of 42.9 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
59% over limit
Discharged 90.8 kg/d against a permitted limit of 57.2 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, suspended percent removal
53% over limit
Discharged 77 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, carb-5 day, 20 deg C, percent removal
147% over limit
Discharged 63 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
56% over limit
Discharged 39 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
38% over limit
Discharged 55 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
97% over limit
Discharged 59 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
147% over limit
Discharged 63 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
53% over limit
Discharged 69 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
November 30, 2025
Solids, total suspended
53% over limit
Discharged 46 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
51% over limit
Discharged 68 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Coliform, fecal MPN + membrane ftl 44.5 C
218% over limit
Discharged 636 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
33% over limit
Discharged 80 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
37% over limit
Discharged 41 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carb-5 day, 20 deg C, percent removal
20% over limit
Discharged 82 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
73% over limit
Discharged 74 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, suspended percent removal
13% over limit
Discharged 83 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Trichloroethylene
0% over limit
Discharged 0.006 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
May 31, 2025
Solids, suspended percent removal
220% over limit
Discharged 52 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
7% over limit
Discharged 48 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carb-5 day, 20 deg C, percent removal
53% over limit
Discharged 77 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Coliform, fecal MPN + membrane ftl 44.5 C
145% over limit
Discharged 490 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
April 30, 2025
Coliform, fecal MPN + membrane ftl 44.5 C
91% over limit
Discharged 382 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
March 31, 2025
Trichloroethylene
0% over limit
Discharged 0.0084 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
January 31, 2025
BOD, carbonaceous [5 day, 20 C]
40% over limit
Discharged 35 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carb-5 day, 20 deg C, percent removal
7% over limit
Discharged 84 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
40% over limit
Discharged 56 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
December 31, 2024
Trichloroethylene
0% over limit
Discharged 0.0065 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR 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 (QRTR AVG)
DMR, Monitor Only - Overdue
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
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
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
September 30, 2024
Trichloroethylene
0% over limit
Discharged 0.0073 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (3 hours ago)