CITY OF WINONA WWTF
NPDES ID: TX0073229
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: 6 permit schedule violations.
Violations
March 31, 2026
Solids, total suspended
4% over limit
Discharged 47 mg/L against a permitted limit of 45 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
25% over limit
Discharged 0.73547999 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
66% over limit
Discharged 6.65 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
36% over limit
Discharged 61 mg/L against a permitted limit of 45 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
28% over limit
Discharged 3.6 mg/L against a permitted limit of 5 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
46% over limit
Discharged 0.86205519 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
105% over limit
Discharged 8.19 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
3% over limit
Discharged 4.13 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
9% over limit
Discharged 49 mg/L against a permitted limit of 45 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
November 30, 2025
Solids, total suspended
11% over limit
Discharged 50 mg/L against a permitted limit of 45 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
September 30, 2025
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
22% over limit
Discharged 4.86 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 10.1 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
July 31, 2025
Flow, in conduit or thru treatment plant
13% over limit
Discharged 0.0451 MGD against a permitted limit of 0.04 MGD (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
4% over limit
Discharged 7.06364974 kg/d against a permitted limit of 6.80999994 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
72% over limit
Discharged 1.01677839 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 10 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
33% over limit
Discharged 5.3 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
42% over limit
Discharged 5.66 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
170% over limit
Discharged 1.59462959 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
109% over limit
Discharged 0.0834 MGD against a permitted limit of 0.04 MGD (DAILY AV)
DMR, Limited - Numeric Violation
May 31, 2025
Flow, in conduit or thru treatment plant
41% over limit
Discharged 0.0563 MGD against a permitted limit of 0.04 MGD (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
11% over limit
Discharged 7.55732934 kg/d against a permitted limit of 6.80999994 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
361% over limit
Discharged 2.72041338 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
172% over limit
Discharged 10.88 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
272% over limit
Discharged 2.19813178 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
148% over limit
Discharged 9.92 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
19% over limit
Discharged 0.0477 MGD against a permitted limit of 0.04 MGD (DAILY AV)
DMR, Limited - Numeric Violation
E. coli
37% over limit
Discharged 173 MPN/100mL against a permitted limit of 126 MPN/100mL (DAILY AV)
DMR, Limited - Numeric Violation
March 31, 2025
pH
0% over limit
Discharged 9.6 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
197% over limit
Discharged 1.75153199 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
248% over limit
Discharged 13.9 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
February 28, 2025
Oxygen, dissolved [DO]
32% over limit
Discharged 3.4 mg/L against a permitted limit of 5 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
523% over limit
Discharged 3.67853497 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
12% over limit
Discharged 0.0447 MGD against a permitted limit of 0.04 MGD (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
446% over limit
Discharged 21.85 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
78% over limit
Discharged 28.5 mg/L against a permitted limit of 16 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
January 31, 2025
Oxygen, dissolved [DO]
14% over limit
Discharged 4.3 mg/L against a permitted limit of 5 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
675% over limit
Discharged 4.57509416 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
601% over limit
Discharged 28.03 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
156% over limit
Discharged 40.9 mg/L against a permitted limit of 16 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
37% over limit
Discharged 0.0549 MGD against a permitted limit of 0.04 MGD (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
70% over limit
Discharged 27.2 mg/L against a permitted limit of 16 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
179% over limit
Discharged 1.64375239 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
367% over limit
Discharged 18.68 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
November 30, 2024
Oxygen, dissolved [DO]
20% over limit
Discharged 4 mg/L against a permitted limit of 5 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
188% over limit
Discharged 11.53 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
114% over limit
Discharged 1.26166599 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
4% over limit
Discharged 16.6 mg/L against a permitted limit of 16 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
October 31, 2024
Oxygen, dissolved [DO]
12% over limit
Discharged 4.4 mg/L against a permitted limit of 5 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
24% over limit
Discharged 4.96 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
10% over limit
Discharged 4.4 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
August 31, 2024
Oxygen, dissolved [DO]
40% over limit
Discharged 3 mg/L against a permitted limit of 5 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
30% over limit
Discharged 0.052 MGD against a permitted limit of 0.04 MGD (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
103% over limit
Discharged 8.11 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
188% over limit
Discharged 1.69759679 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
July 31, 2024
Flow, in conduit or thru treatment plant
48% over limit
Discharged 0.0593 MGD against a permitted limit of 0.04 MGD (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
354% over limit
Discharged 2.67859998 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
7% over limit
Discharged 7.28215994 kg/d against a permitted limit of 6.80999994 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
111% over limit
Discharged 8.45 mg/L against a permitted limit of 4 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
33% over limit
Discharged 6.03819995 kg/d against a permitted limit of 4.53999996 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)