SPENCER MUNICIPAL WWTP
NPDES ID: IN0020192
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: 1 effluent violation.
Violations
April 30, 2026
Solids, total suspended
17% over limit
Discharged 35 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
170% over limit
Discharged 81 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
17% over limit
Discharged 6.8 mg/L against a permitted limit of 5.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
80% over limit
Discharged 1.8 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
30% over limit
Discharged 155.81279869 kg/d against a permitted limit of 119.401999 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
47% over limit
Discharged 12.8 mg/L against a permitted limit of 8.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
15% over limit
Discharged 91.48099923 kg/d against a permitted limit of 79.44999933 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
204% over limit
Discharged 136.7 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
6% over limit
Discharged 24.51599979 kg/d against a permitted limit of 23.06319981 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
254% over limit
Discharged 159.3 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
60% over limit
Discharged 1.6 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
38% over limit
Discharged 109.27779908 kg/d against a permitted limit of 79.44999933 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
95% over limit
Discharged 11.3 mg/L against a permitted limit of 5.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
183% over limit
Discharged 85 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
66% over limit
Discharged 198.48879833 kg/d against a permitted limit of 119.401999 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
128% over limit
Discharged 19.8 mg/L against a permitted limit of 8.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, ammonia total [as N]
7% over limit
Discharged 16.52559986 kg/d against a permitted limit of 15.39059987 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
25% over limit
Discharged 99.38059916 kg/d against a permitted limit of 79.44999933 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
136% over limit
Discharged 13.7 mg/L against a permitted limit of 5.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
133% over limit
Discharged 20.3 mg/L against a permitted limit of 8.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
178% over limit
Discharged 83.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
20% over limit
Discharged 143.78179879 kg/d against a permitted limit of 119.401999 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
218% over limit
Discharged 143.3 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
70% over limit
Discharged 1.7 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
98% over limit
Discharged 17.2 mg/L against a permitted limit of 8.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
112% over limit
Discharged 95.3 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
153% over limit
Discharged 14.7 mg/L against a permitted limit of 5.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
10% over limit
Discharged 87.07719927 kg/d against a permitted limit of 79.44999933 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
173% over limit
Discharged 81.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
15% over limit
Discharged 17.66059985 kg/d against a permitted limit of 15.39059987 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
166% over limit
Discharged 2.66 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
105% over limit
Discharged 11.9 mg/L against a permitted limit of 5.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
90% over limit
Discharged 56.9 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
62% over limit
Discharged 14.1 mg/L against a permitted limit of 8.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
110% over limit
Discharged 2.1 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
120% over limit
Discharged 99 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
August 31, 2025
Solids, total suspended
306% over limit
Discharged 121.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
49% over limit
Discharged 13 mg/L against a permitted limit of 8.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
236% over limit
Discharged 151 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
48% over limit
Discharged 8.6 mg/L against a permitted limit of 5.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
68% over limit
Discharged 133.11279888 kg/d against a permitted limit of 79.44999933 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
25% over limit
Discharged 149.22979875 kg/d against a permitted limit of 119.401999 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
100% over limit
Discharged 2 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
E. coli, colony forming units [CFU]
2% over limit
Discharged 240 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
71% over limit
Discharged 204.52699828 kg/d against a permitted limit of 119.401999 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
48% over limit
Discharged 12.9 mg/L against a permitted limit of 8.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
41% over limit
Discharged 8.2 mg/L against a permitted limit of 5.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
60% over limit
Discharged 1.6 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
155% over limit
Discharged 76.6 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
137% over limit
Discharged 106.7 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
57% over limit
Discharged 124.98619895 kg/d against a permitted limit of 79.44999933 kg/d (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
4% over limit
Discharged 16.01257987 kg/d against a permitted limit of 15.39059987 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
46% over limit
Discharged 12.7 mg/L against a permitted limit of 8.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
199% over limit
Discharged 134.67 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
170% over limit
Discharged 2.7 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2% over limit
Discharged 23.5171998 kg/d against a permitted limit of 23.06319981 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
106% over limit
Discharged 163.75325862 kg/d against a permitted limit of 79.44999933 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
61% over limit
Discharged 9.31 mg/L against a permitted limit of 5.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
92% over limit
Discharged 229.06569808 kg/d against a permitted limit of 119.401999 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
217% over limit
Discharged 95.2 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
99% over limit
Discharged 158.12819867 kg/d against a permitted limit of 79.44999933 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1% over limit
Discharged 15.57219987 kg/d against a permitted limit of 15.39059987 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
41% over limit
Discharged 12.3 mg/L against a permitted limit of 8.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
383% over limit
Discharged 217.2 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
50% over limit
Discharged 37.6 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
30% over limit
Discharged 1.3 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
79% over limit
Discharged 10.4 mg/L against a permitted limit of 5.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
121% over limit
Discharged 264.18259778 kg/d against a permitted limit of 119.401999 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
258% over limit
Discharged 107.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
11% over limit
Discharged 9.7 mg/L against a permitted limit of 8.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
91% over limit
Discharged 227.85805809 kg/d against a permitted limit of 119.401999 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
78% over limit
Discharged 141.80689881 kg/d against a permitted limit of 79.44999933 kg/d (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
260% over limit
Discharged 450 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
41772% over limit
Discharged 98400 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
80% over limit
Discharged 1.8 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
145% over limit
Discharged 110.3 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
124% over limit
Discharged 67.2 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)