GNAW BONE REGIONAL SEWER DISTRICT
NPDES ID: IN0060526
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: 30 effluent violations.
Violations
May 31, 2026
E. coli, colony forming units [CFU]
125% over limit
Discharged 281 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1055% over limit
Discharged 23.1 mg/L against a permitted limit of 2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
72% over limit
Discharged 7.49099994 kg/d against a permitted limit of 4.35839996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.5 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
41% over limit
Discharged 4.04604797 kg/d against a permitted limit of 2.86019998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
747% over limit
Discharged 1990 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
936% over limit
Discharged 13.47 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
81% over limit
Discharged 32.5 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
45% over limit
Discharged 21.8 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
914% over limit
Discharged 3.68239397 kg/d against a permitted limit of 0.3632 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
104% over limit
Discharged 47 mg/L against a permitted limit of 23 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
101% over limit
Discharged 10.28763991 kg/d against a permitted limit of 5.13019996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
81% over limit
Discharged 49 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
10% over limit
Discharged 5.4 mg/L against a permitted limit of 6 mg/L (DLYAVMIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1052% over limit
Discharged 2.61503998 kg/d against a permitted limit of 0.227 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
84% over limit
Discharged 6.26065995 kg/d against a permitted limit of 3.40499997 kg/d (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
785% over limit
Discharged 75.54559937 kg/d against a permitted limit of 8.53519993 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
862% over limit
Discharged 433 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
437% over limit
Discharged 30.46793974 kg/d against a permitted limit of 5.67499995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
669% over limit
Discharged 3.83856997 kg/d against a permitted limit of 0.4994 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
388% over limit
Discharged 36.99191969 kg/d against a permitted limit of 7.58179994 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
885% over limit
Discharged 26.6 mg/L against a permitted limit of 2.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1106% over limit
Discharged 21.7 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
197% over limit
Discharged 14.01497988 kg/d against a permitted limit of 4.72159996 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
501% over limit
Discharged 180.3 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
930% over limit
Discharged 2420 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
430% over limit
Discharged 212 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
235% over limit
Discharged 83.7 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
569% over limit
Discharged 836 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
821% over limit
Discharged 3.34507197 kg/d against a permitted limit of 0.3632 kg/d (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, carbonaceous [5 day, 20 C]
174% over limit
Discharged 20.80227983 kg/d against a permitted limit of 7.58179994 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
174% over limit
Discharged 68.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
652% over limit
Discharged 225.6 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
450% over limit
Discharged 9.9 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
836% over limit
Discharged 79.90399933 kg/d against a permitted limit of 8.53519993 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
691% over limit
Discharged 44.86427962 kg/d against a permitted limit of 5.67499995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
363% over limit
Discharged 12.5 mg/L against a permitted limit of 2.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
171% over limit
Discharged 12.79371989 kg/d against a permitted limit of 4.72159996 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
240% over limit
Discharged 136 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
289% over limit
Discharged 1.94130398 kg/d against a permitted limit of 0.4994 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
366% over limit
Discharged 1.69160399 kg/d against a permitted limit of 0.3632 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
618% over limit
Discharged 323 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
967% over limit
Discharged 91.07239923 kg/d against a permitted limit of 8.53519993 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
5% over limit
Discharged 4.96221996 kg/d against a permitted limit of 4.72159996 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
70% over limit
Discharged 4.6 mg/L against a permitted limit of 2.7 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
419% over limit
Discharged 155.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
642% over limit
Discharged 334 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
485% over limit
Discharged 33.21917972 kg/d against a permitted limit of 5.67499995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
9% over limit
Discharged 8.26733993 kg/d against a permitted limit of 7.58179994 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
360% over limit
Discharged 207 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
358% over limit
Discharged 137.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
pH
0% over limit
Discharged 8.2 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 1.503 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
26% over limit
Discharged 37.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 7 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Overdue
November 30, 2025
Solids, total suspended
191% over limit
Discharged 14.90481987 kg/d against a permitted limit of 5.13019996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
83% over limit
Discharged 1 mg/L against a permitted limit of 6 mg/L (DLYAVMIN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
52% over limit
Discharged 22.8 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
627% over limit
Discharged 130.8 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
169% over limit
Discharged 9.16625992 kg/d against a permitted limit of 3.40499997 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
26% over limit
Discharged 29 mg/L against a permitted limit of 23 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
685% over limit
Discharged 212 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
October 31, 2025
BOD, carbonaceous [5 day, 20 C]
26% over limit
Discharged 29 mg/L against a permitted limit of 23 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
424% over limit
Discharged 94.4 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
467% over limit
Discharged 153 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
930% over limit
Discharged 2420 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
15% over limit
Discharged 5.92015995 kg/d against a permitted limit of 5.13019996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
1% over limit
Discharged 3.45039997 kg/d against a permitted limit of 3.40499997 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
13% over limit
Discharged 17 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
1836% over limit
Discharged 2420 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
197% over limit
Discharged 10.10603992 kg/d against a permitted limit of 3.40499997 kg/d (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
972% over limit
Discharged 2520 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
783% over limit
Discharged 1104 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 3.2 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 3.2 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Numeric Violation
Solids, total suspended
288% over limit
Discharged 19.92605983 kg/d against a permitted limit of 5.13019996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
265% over limit
Discharged 65.7 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
265% over limit
Discharged 65.7 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
474% over limit
Discharged 155 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Overdue
Solids, total suspended
474% over limit
Discharged 155 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
63% over limit
Discharged 2.2 mg/L against a permitted limit of 6 mg/L (DLYAVMIN)
DMR, Limited - Numeric Violation
August 31, 2025
E. coli, colony forming units [CFU]
3623% over limit
Discharged 8749 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
187% over limit
Discharged 77.4 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
138% over limit
Discharged 42.8 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
1161% over limit
Discharged 1576 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
48% over limit
Discharged 7.61811994 kg/d against a permitted limit of 5.13019996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
35% over limit
Discharged 2.7 mg/L against a permitted limit of 2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
10% over limit
Discharged 0.2497 kg/d against a permitted limit of 0.227 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
425% over limit
Discharged 10.5 mg/L against a permitted limit of 2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
174% over limit
Discharged 0.99425999 kg/d against a permitted limit of 0.3632 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
103% over limit
Discharged 2.64 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
141% over limit
Discharged 4.812 mg/L against a permitted limit of 2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
265% over limit
Discharged 4.749 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
74% over limit
Discharged 0.39498 kg/d against a permitted limit of 0.227 kg/d (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Solids, total suspended
4% over limit
Discharged 28 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
July 31, 2024
Nitrogen, ammonia total [as N]
124% over limit
Discharged 4.48 mg/L against a permitted limit of 2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
21% over limit
Discharged 0.44038 kg/d against a permitted limit of 0.3632 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)