CITY OF CHICO
NPDES ID: TX0023787
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.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
273% over limit
Discharged 56 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
884% over limit
Discharged 49.2 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
302% over limit
Discharged 11.4861999 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
792% over limit
Discharged 44.6 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
E. coli
117% over limit
Discharged 866 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
287% over limit
Discharged 11.07759991 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
342% over limit
Discharged 66.3 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
250% over limit
Discharged 52.5 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
179% over limit
Discharged 7.98585993 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
538% over limit
Discharged 31.88 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
622% over limit
Discharged 36.08 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
218% over limit
Discharged 47.7 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
152% over limit
Discharged 7.19589994 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
273% over limit
Discharged 55.9 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
203% over limit
Discharged 8.68047993 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
714% over limit
Discharged 40.7 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
6% over limit
Discharged 21.1 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
858% over limit
Discharged 47.9 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
174% over limit
Discharged 7.84965993 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
277% over limit
Discharged 56.6 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, ammonia total [as N]
261% over limit
Discharged 54.1 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
842% over limit
Discharged 47.1 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
333% over limit
Discharged 12.3941999 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
219% over limit
Discharged 9.12539992 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
18% over limit
Discharged 23.5 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
280% over limit
Discharged 57 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
964% over limit
Discharged 53.2 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
766% over limit
Discharged 43.3 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
214% over limit
Discharged 47.1 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
178% over limit
Discharged 7.95861993 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
August 31, 2025
Solids, total suspended
25% over limit
Discharged 25 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
177% over limit
Discharged 7.90867993 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
839% over limit
Discharged 46.95 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
247% over limit
Discharged 52 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
264% over limit
Discharged 54.6 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
115% over limit
Discharged 6.15623995 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
647% over limit
Discharged 37.34 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
3% over limit
Discharged 3.9 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Chlorine, total residual
3% over limit
Discharged 4.1 mg/L against a permitted limit of 4 mg/L (MO MAX)
DMR, Limited - Numeric Violation
E. coli
16% over limit
Discharged 461 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
40% over limit
Discharged 3.99973997 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
149% over limit
Discharged 37.4 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
256% over limit
Discharged 17.82 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
35% over limit
Discharged 20.3 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
E. coli
181% over limit
Discharged 1120 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
52% over limit
Discharged 7.61 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
78% over limit
Discharged 5.09387996 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
131% over limit
Discharged 150 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
180% over limit
Discharged 56 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
E. coli
507% over limit
Discharged 2420 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
182% over limit
Discharged 31.96159973 kg/d against a permitted limit of 11.3499999 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
60% over limit
Discharged 31.9 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
46% over limit
Discharged 16.52559986 kg/d against a permitted limit of 11.3499999 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
356% over limit
Discharged 22.81 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
15% over limit
Discharged 74.7 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Chlorine, total residual
40% over limit
Discharged 0.6 mg/L against a permitted limit of 1 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
271% over limit
Discharged 55.7 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
151% over limit
Discharged 37.7 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
311% over limit
Discharged 20.54 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
8% over limit
Discharged 3.08265997 kg/d against a permitted limit of 2.86019998 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
60% over limit
Discharged 8 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, total suspended
12% over limit
Discharged 22.3 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
E. coli
63% over limit
Discharged 649 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
December 31, 2024
E. coli
507% over limit
Discharged 2420 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
5% over limit
Discharged 3.8 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
12% over limit
Discharged 5.58 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
47% over limit
Discharged 29.4 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
November 30, 2024
Chlorine, total residual
50% over limit
Discharged 0.5 mg/L against a permitted limit of 1 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Solids, total suspended
26% over limit
Discharged 25.2 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, total suspended
15% over limit
Discharged 22.9 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
45% over limit
Discharged 7.27 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
September 30, 2024
Solids, total suspended
57% over limit
Discharged 102 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
E. coli
507% over limit
Discharged 2420 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
231% over limit
Discharged 37.54579968 kg/d against a permitted limit of 11.3499999 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
180% over limit
Discharged 56 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
5% over limit
Discharged 3.8 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
August 31, 2024
Solids, total suspended
133% over limit
Discharged 46.5 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
E. coli
117% over limit
Discharged 866 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
39% over limit
Discharged 20.9 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
5% over limit
Discharged 3.8 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Solids, total suspended
10% over limit
Discharged 71.7 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
153% over limit
Discharged 12.63 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
July 31, 2024
Oxygen, dissolved [DO]
5% over limit
Discharged 3.8 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
51% over limit
Discharged 22.6 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
12% over limit
Discharged 73 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
54% over limit
Discharged 7.69 mg/L against a permitted limit of 5 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
32% over limit
Discharged 26.4 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)