GIBBON WASTEWATER TREATMENT FACILITY
NPDES ID: NE0029297
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: 7 effluent violations, 1 compliance schedule violation.
Violations
June 30, 2026
Nitrogen, ammonia total [as N]
2906% over limit
Discharged 50.5 mg/L against a permitted limit of 1.68 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1116% over limit
Discharged 113.01 kg/d against a permitted limit of 9.29 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
611% over limit
Discharged 32.94 kg/d against a permitted limit of 4.63 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1562% over limit
Discharged 13.96 mg/L against a permitted limit of 0.84 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2026
Nitrogen, ammonia total [as N]
12% over limit
Discharged 13.89 kg/d against a permitted limit of 12.4 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
94% over limit
Discharged 4.4 mg/L against a permitted limit of 2.27 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
22% over limit
Discharged 1.38 mg/L against a permitted limit of 1.13 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
139% over limit
Discharged 2.7 mg/L against a permitted limit of 1.13 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
331% over limit
Discharged 53.4 kg/d against a permitted limit of 12.4 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
468% over limit
Discharged 12.9 mg/L against a permitted limit of 2.27 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
81% over limit
Discharged 11.17 kg/d against a permitted limit of 6.18 kg/d (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Solids, total suspended
22% over limit
Discharged 55 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
3% over limit
Discharged 31 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Toxicity [acute], Ceriodaphnia dubia
0% over limit
Discharged 0 toxic against a permitted limit of 0 toxic (MO AVG)
DMR, Monitor Only - Overdue
Toxicity [acute], Pimephales promelas [Fathead Minnow]
0% over limit
Discharged 0 toxic against a permitted limit of 0 toxic (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
33% over limit
Discharged 60 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Oil and grease, hexane extr method
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
2198% over limit
Discharged 106.4 kg/d against a permitted limit of 4.63 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Oil and grease, hexane extr method
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Priority pollutants scan [yes/no]
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (VALUE)
DMR, Monitor Only - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
2864% over limit
Discharged 24.9 mg/L against a permitted limit of 0.84 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Toxicity [acute], Pimephales promelas [Fathead Minnow]
0% over limit
Discharged 0 toxic against a permitted limit of 1 toxic (DAILY MX)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
5793% over limit
Discharged 99 mg/L against a permitted limit of 1.68 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
11% over limit
Discharged 379.1 kg/d against a permitted limit of 341 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Toxicity [acute], Ceriodaphnia dubia
0% over limit
Discharged 0 toxic against a permitted limit of 1 toxic (DAILY MX)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
6633% over limit
Discharged 625.5 kg/d against a permitted limit of 9.29 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
2521% over limit
Discharged 59.5 mg/L against a permitted limit of 2.27 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
257% over limit
Discharged 107 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1397% over limit
Discharged 92.5 kg/d against a permitted limit of 6.18 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1969% over limit
Discharged 23.38 mg/L against a permitted limit of 1.13 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1728% over limit
Discharged 226.7 kg/d against a permitted limit of 12.4 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
544% over limit
Discharged 290 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
118% over limit
Discharged 54.4 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
6% over limit
Discharged 321.6 kg/d against a permitted limit of 303 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
95% over limit
Discharged 443 kg/d against a permitted limit of 227 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
95% over limit
Discharged 78 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
265% over limit
Discharged 1245 kg/d against a permitted limit of 341 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
16% over limit
Discharged 219.4 kg/d against a permitted limit of 189 kg/d (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total suspended
56% over limit
Discharged 532 kg/d against a permitted limit of 341 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
403% over limit
Discharged 151 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
4107% over limit
Discharged 95.5 mg/L against a permitted limit of 2.27 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3596% over limit
Discharged 228.4 kg/d against a permitted limit of 6.18 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
1396% over limit
Discharged 4533.4 kg/d against a permitted limit of 303 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
98% over limit
Discharged 373.6 kg/d against a permitted limit of 189 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
382% over limit
Discharged 120.6 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
433% over limit
Discharged 213 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
6519% over limit
Discharged 74.8 mg/L against a permitted limit of 1.13 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2141% over limit
Discharged 277.9 kg/d against a permitted limit of 12.4 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
103% over limit
Discharged 461 kg/d against a permitted limit of 227 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
289% over limit
Discharged 175 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
March 31, 2025
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 1357 mg/L against a permitted limit of 0 mg/L (VALUE)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 1.258 MGD against a permitted limit of 0 MGD (VALUE)
DMR, Monitor Only - Overdue
Solids, total suspended
279% over limit
Discharged 113.6 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
90% over limit
Discharged 76 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
4157% over limit
Discharged 263.1 kg/d against a permitted limit of 6.18 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
6% over limit
Discharged 322.5 kg/d against a permitted limit of 303 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3380% over limit
Discharged 79 mg/L against a permitted limit of 2.27 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
46% over limit
Discharged 36.4 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
4935% over limit
Discharged 56.9 mg/L against a permitted limit of 1.13 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 7.5 SU against a permitted limit of 0 SU (VALUE)
DMR, Monitor Only - Overdue
Solids, total suspended
149% over limit
Discharged 848.1 kg/d against a permitted limit of 341 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
344% over limit
Discharged 200 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
132% over limit
Discharged 526.3 kg/d against a permitted limit of 227 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 973 mg/L against a permitted limit of 0 mg/L (VALUE)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
2604% over limit
Discharged 335.3 kg/d against a permitted limit of 12.4 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
3099% over limit
Discharged 61.1 mg/L against a permitted limit of 1.91 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
458% over limit
Discharged 167.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
27% over limit
Discharged 384.3 kg/d against a permitted limit of 303 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
243% over limit
Discharged 779.7 kg/d against a permitted limit of 227 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
108% over limit
Discharged 83 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
878% over limit
Discharged 440 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
41% over limit
Discharged 35.2 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2559% over limit
Discharged 289.6 kg/d against a permitted limit of 10.89 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1406% over limit
Discharged 329 kg/d against a permitted limit of 21.85 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
497% over limit
Discharged 2037.4 kg/d against a permitted limit of 341 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1785% over limit
Discharged 72 mg/L against a permitted limit of 3.82 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, total suspended
132% over limit
Discharged 526.3 kg/d against a permitted limit of 227 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1391% over limit
Discharged 325.8 kg/d against a permitted limit of 21.85 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
279% over limit
Discharged 113.6 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
344% over limit
Discharged 200 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
149% over limit
Discharged 848.9 kg/d against a permitted limit of 341 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1968% over limit
Discharged 79 mg/L against a permitted limit of 3.82 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
46% over limit
Discharged 36.4 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2316% over limit
Discharged 263.1 kg/d against a permitted limit of 10.89 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2879% over limit
Discharged 56.9 mg/L against a permitted limit of 1.91 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
90% over limit
Discharged 76 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
6% over limit
Discharged 322.6 kg/d against a permitted limit of 303 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, total suspended
17% over limit
Discharged 35 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
78% over limit
Discharged 80 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
104% over limit
Discharged 3.9 mg/L against a permitted limit of 1.91 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
117% over limit
Discharged 8.3 mg/L against a permitted limit of 3.82 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
48% over limit
Discharged 16.1 kg/d against a permitted limit of 10.89 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
97% over limit
Discharged 43 kg/d against a permitted limit of 21.85 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
28% over limit
Discharged 4.9 mg/L against a permitted limit of 3.82 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, ammonia total [as N]
37% over limit
Discharged 2.3 mg/L against a permitted limit of 1.68 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
36% over limit
Discharged 1.14 mg/L against a permitted limit of 0.84 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
189% over limit
Discharged 130 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
160% over limit
Discharged 885 kg/d against a permitted limit of 341 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
23% over limit
Discharged 11.4 kg/d against a permitted limit of 9.29 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
20% over limit
Discharged 36 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
21% over limit
Discharged 5.6 kg/d against a permitted limit of 4.63 kg/d (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Flow, in conduit or thru treatment plant
0% over limit
Discharged 1.524 MGD against a permitted limit of 0 MGD (VALUE)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 286 mg/L against a permitted limit of 0 mg/L (VALUE)
DMR, Monitor Only - Overdue
Solids, total suspended
81% over limit
Discharged 54.25 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
70% over limit
Discharged 578.34 kg/d against a permitted limit of 341 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
278% over limit
Discharged 170 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2001% over limit
Discharged 17.65 mg/L against a permitted limit of 0.84 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1197% over limit
Discharged 60.05 kg/d against a permitted limit of 4.63 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 978 mg/L against a permitted limit of 0 mg/L (VALUE)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 7.4 SU against a permitted limit of 0 SU (VALUE)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
1912% over limit
Discharged 33.8 mg/L against a permitted limit of 1.68 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1138% over limit
Discharged 114.98 kg/d against a permitted limit of 9.29 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2024
Solids, total suspended
33% over limit
Discharged 39.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
18% over limit
Discharged 53 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1379% over limit
Discharged 68.5 kg/d against a permitted limit of 4.63 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2751% over limit
Discharged 47.9 mg/L against a permitted limit of 1.68 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1433% over limit
Discharged 142.4 kg/d against a permitted limit of 9.29 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2283% over limit
Discharged 20.02 mg/L against a permitted limit of 0.84 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (4 hours ago)