SANDUSKY WWTP
NPDES ID: MI0020222
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 16 effluent violations.
Violations
June 30, 2026
Coliform, fecal general
80% over limit
Discharged 718 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
50% over limit
Discharged 44.9 mg/L against a permitted limit of 30 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
3% over limit
Discharged 20.5 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
8% over limit
Discharged 117.13199902 kg/d against a permitted limit of 108.95999908 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
36% over limit
Discharged 272 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
April 30, 2026
Coliform, fecal general
167% over limit
Discharged 1069 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
25% over limit
Discharged 2.26999998 kg/d against a permitted limit of 1.81599998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
94% over limit
Discharged 14.07399988 kg/d against a permitted limit of 7.26399994 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
193% over limit
Discharged 5.31179996 kg/d against a permitted limit of 1.81599998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
42% over limit
Discharged 284 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
140% over limit
Discharged 1.2 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
16% over limit
Discharged 16.79799986 kg/d against a permitted limit of 14.52799988 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
420% over limit
Discharged 10.4 mg/L against a permitted limit of 2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
101% over limit
Discharged 218.82799816 kg/d against a permitted limit of 108.95999908 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
41% over limit
Discharged 42.4 mg/L against a permitted limit of 30 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
29% over limit
Discharged 93.52399921 kg/d against a permitted limit of 72.63999939 kg/d (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Phosphorus, total [as P]
4% over limit
Discharged 0.52 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
10% over limit
Discharged 2.2 mg/L against a permitted limit of 2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Phosphorus, total [as P]
20% over limit
Discharged 0.6 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
14% over limit
Discharged 0.57 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
6% over limit
Discharged 0.53 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
152% over limit
Discharged 1.26 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
223% over limit
Discharged 6.46 mg/L against a permitted limit of 2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
2% over limit
Discharged 0.51 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
13% over limit
Discharged 6.1 mg/L against a permitted limit of 7 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Coliform, fecal general
176% over limit
Discharged 1104 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 7.49099994 kg/d against a permitted limit of 7.26399994 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
95% over limit
Discharged 3.54119997 kg/d against a permitted limit of 1.81599998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Phosphorus, total [as P]
10% over limit
Discharged 0.55 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Coliform, fecal general
31% over limit
Discharged 525 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
25% over limit
Discharged 250 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
October 31, 2024
Coliform, fecal general
106% over limit
Discharged 411 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Coliform, fecal general
151% over limit
Discharged 1002 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
September 30, 2024
Coliform, fecal general
74% over limit
Discharged 696 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
67% over limit
Discharged 333 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
156% over limit
Discharged 5.12 mg/L against a permitted limit of 2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
20% over limit
Discharged 0.6 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
53% over limit
Discharged 306 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Coliform, fecal general
98% over limit
Discharged 790 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 1.86139998 kg/d against a permitted limit of 1.81599998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (8 hours ago)