HUMBOLDT WASTEWATER TREATMENT FACILITY
NPDES ID: NE0031844
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: 13 effluent violations.
Violations
March 31, 2026
BOD, carbonaceous [5 day, 20 C]
12% over limit
Discharged 44.7 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
40% over limit
Discharged 15.6 mg/L against a permitted limit of 11.12 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
87% over limit
Discharged 4.54 kg/d against a permitted limit of 2.43 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
79% over limit
Discharged 44.7 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
182% over limit
Discharged 15.6 mg/L against a permitted limit of 5.54 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
269% over limit
Discharged 15.6 mg/L against a permitted limit of 4.23 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
639% over limit
Discharged 15.6 mg/L against a permitted limit of 2.11 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
455% over limit
Discharged 4.72 kg/d against a permitted limit of 0.85 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
178% over limit
Discharged 4.72 kg/d against a permitted limit of 1.7 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
484% over limit
Discharged 4.96 kg/d against a permitted limit of 0.85 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
57% over limit
Discharged 62.8 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
288% over limit
Discharged 16.4 mg/L against a permitted limit of 4.23 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
147% over limit
Discharged 74 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
151% over limit
Discharged 62.8 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
677% over limit
Discharged 16.4 mg/L against a permitted limit of 2.11 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
192% over limit
Discharged 4.96 kg/d against a permitted limit of 1.7 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
64% over limit
Discharged 74 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
347% over limit
Discharged 3.8 kg/d against a permitted limit of 0.85 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
271% over limit
Discharged 15.7 mg/L against a permitted limit of 4.23 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
124% over limit
Discharged 3.8 kg/d against a permitted limit of 1.7 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]
644% over limit
Discharged 15.7 mg/L against a permitted limit of 2.11 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
BOD, carbonaceous [5 day, 20 C]
17% over limit
Discharged 46.7 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
210% over limit
Discharged 13.1 mg/L against a permitted limit of 4.23 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
16% over limit
Discharged 52 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
87% over limit
Discharged 46.7 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
171% over limit
Discharged 4.6 kg/d against a permitted limit of 1.7 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
441% over limit
Discharged 4.6 kg/d against a permitted limit of 0.85 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
73% over limit
Discharged 52 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
521% over limit
Discharged 13.1 mg/L against a permitted limit of 2.11 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
180% over limit
Discharged 3 kg/d against a permitted limit of 1.07 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
332% over limit
Discharged 10.2 mg/L against a permitted limit of 2.36 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
40% over limit
Discharged 3 kg/d against a permitted limit of 2.15 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
115% over limit
Discharged 10.2 mg/L against a permitted limit of 4.74 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
78% over limit
Discharged 3.83 kg/d against a permitted limit of 2.15 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
12% over limit
Discharged 26 kg/d against a permitted limit of 23.28 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
147% over limit
Discharged 74 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 298 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
130% over limit
Discharged 10.9 mg/L against a permitted limit of 4.74 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
362% over limit
Discharged 10.9 mg/L against a permitted limit of 2.36 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
258% over limit
Discharged 3.83 kg/d against a permitted limit of 1.07 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
46% over limit
Discharged 36.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Solids, total suspended
64% over limit
Discharged 74 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
339% over limit
Discharged 4.7 kg/d against a permitted limit of 1.07 kg/d (MO AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 298 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
379% over limit
Discharged 11.3 mg/L against a permitted limit of 2.36 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
119% over limit
Discharged 4.7 kg/d against a permitted limit of 2.15 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
138% over limit
Discharged 11.3 mg/L against a permitted limit of 4.74 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
71% over limit
Discharged 8.09 mg/L against a permitted limit of 4.74 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
397% over limit
Discharged 5.32 kg/d against a permitted limit of 1.07 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
243% over limit
Discharged 8.09 mg/L against a permitted limit of 2.36 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 298 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
147% over limit
Discharged 5.32 kg/d against a permitted limit of 2.15 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
577% over limit
Discharged 7.24 kg/d against a permitted limit of 1.07 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
231% over limit
Discharged 15.7 mg/L against a permitted limit of 4.74 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 298 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
237% over limit
Discharged 7.24 kg/d against a permitted limit of 2.15 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
565% over limit
Discharged 15.7 mg/L against a permitted limit of 2.36 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
E. coli, MTEC-MF
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
332% over limit
Discharged 10.5 kg/d against a permitted limit of 2.43 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
169% over limit
Discharged 14.9 mg/L against a permitted limit of 5.54 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 2419.6 MPN/100mL against a permitted limit of 298 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
115% over limit
Discharged 10.5 kg/d against a permitted limit of 4.88 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
9% over limit
Discharged 27.2 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
34% over limit
Discharged 14.9 mg/L against a permitted limit of 11.12 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
BOD, carbonaceous [5 day, 20 C]
12% over limit
Discharged 28.1 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
106% over limit
Discharged 11.4 mg/L against a permitted limit of 5.54 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
99% over limit
Discharged 4.83 kg/d against a permitted limit of 2.43 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 11.4 mg/L against a permitted limit of 11.12 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
17% over limit
Discharged 13 mg/L against a permitted limit of 11.12 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
135% over limit
Discharged 13 mg/L against a permitted limit of 5.54 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
76% over limit
Discharged 4.28 kg/d against a permitted limit of 2.43 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
8% over limit
Discharged 27.1 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
729% over limit
Discharged 17.5 mg/L against a permitted limit of 2.11 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
64% over limit
Discharged 2.78 kg/d against a permitted limit of 1.7 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
33% over limit
Discharged 53.2 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
314% over limit
Discharged 17.5 mg/L against a permitted limit of 4.23 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
23% over limit
Discharged 37 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
113% over limit
Discharged 53.2 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
227% over limit
Discharged 2.78 kg/d against a permitted limit of 0.85 kg/d (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
122% over limit
Discharged 3.78 kg/d against a permitted limit of 1.7 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
11% over limit
Discharged 50 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
848% over limit
Discharged 20 mg/L against a permitted limit of 2.11 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
373% over limit
Discharged 20 mg/L against a permitted limit of 4.23 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
67% over limit
Discharged 50 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
345% over limit
Discharged 3.78 kg/d against a permitted limit of 0.85 kg/d (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
635% over limit
Discharged 15.5 mg/L against a permitted limit of 2.11 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
313% over limit
Discharged 3.51 kg/d against a permitted limit of 0.85 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
45% over limit
Discharged 36.3 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
106% over limit
Discharged 3.51 kg/d against a permitted limit of 1.7 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
266% over limit
Discharged 15.5 mg/L against a permitted limit of 4.23 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
325% over limit
Discharged 3.61 kg/d against a permitted limit of 0.85 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
112% over limit
Discharged 3.61 kg/d against a permitted limit of 1.7 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
668% over limit
Discharged 16.2 mg/L against a permitted limit of 2.11 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
283% over limit
Discharged 16.2 mg/L against a permitted limit of 4.23 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, total suspended
13% over limit
Discharged 34 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
320% over limit
Discharged 19.9 mg/L against a permitted limit of 4.74 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
743% over limit
Discharged 19.9 mg/L against a permitted limit of 2.36 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
117% over limit
Discharged 4.66 kg/d against a permitted limit of 2.15 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
336% over limit
Discharged 4.66 kg/d against a permitted limit of 1.07 kg/d (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
203% over limit
Discharged 3.24 kg/d against a permitted limit of 1.07 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
506% over limit
Discharged 14.3 mg/L against a permitted limit of 2.36 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
202% over limit
Discharged 14.3 mg/L against a permitted limit of 4.74 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
51% over limit
Discharged 3.24 kg/d against a permitted limit of 2.15 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
493% over limit
Discharged 14 mg/L against a permitted limit of 2.36 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1933% over limit
Discharged 43.7 kg/d against a permitted limit of 2.15 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3984% over limit
Discharged 43.7 kg/d against a permitted limit of 1.07 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
195% over limit
Discharged 14 mg/L against a permitted limit of 4.74 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)