CITY OF GARRISON WWTP
NPDES ID: TX0076503
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: 8 effluent violations.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
140% over limit
Discharged 19.2 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
46% over limit
Discharged 21.9 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
41% over limit
Discharged 5.13019996 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
98% over limit
Discharged 15.8 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
44% over limit
Discharged 5.22099996 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
E. coli
1821% over limit
Discharged 2420 MPN/100mL against a permitted limit of 126 MPN/100mL (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
61% over limit
Discharged 24.1 mg/L against a permitted limit of 15 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
March 31, 2026
Nitrogen, ammonia total [as N]
61% over limit
Discharged 5.85659995 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1% over limit
Discharged 15.2 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
45% over limit
Discharged 11.6 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
February 28, 2026
E. coli
507% over limit
Discharged 2420 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
13% over limit
Discharged 16.9 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
5% over limit
Discharged 3.80905997 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
23% over limit
Discharged 9.81 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
E. coli
1821% over limit
Discharged 2420 MPN/100mL against a permitted limit of 126 MPN/100mL (DAILY AV)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
0% over limit
Discharged 6.40139995 kg/d against a permitted limit of 40.86 kg/d (DAILY AV)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 1.14 mg/L against a permitted limit of 1 mg/L (MO MIN)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 3.42315997 kg/d against a permitted limit of 13.61999989 kg/d (DAILY AV)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 2 MPN/100mL against a permitted limit of 126 MPN/100mL (DAILY AV)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.7 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 3.62 mg/L against a permitted limit of 4 mg/L (MO MAX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.10529 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 5.1 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.7 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 15.4 mg/L against a permitted limit of 90 mg/L (DAILY AV)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.10187 MGD against a permitted limit of 0.12 MGD (DAILY AV)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 2 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 11 mg/L against a permitted limit of 100 mg/L (SINGGRAB)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
494% over limit
Discharged 89.1 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
494% over limit
Discharged 89.1 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
161% over limit
Discharged 9.48859992 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
161% over limit
Discharged 9.48859992 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 7.4 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
266% over limit
Discharged 29.3 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
266% over limit
Discharged 29.3 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
21% over limit
Discharged 18.1 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
28% over limit
Discharged 10.2 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, ammonia total [as N]
12% over limit
Discharged 8.94 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
54% over limit
Discharged 12.3 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
26% over limit
Discharged 18.9 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
118% over limit
Discharged 17.4 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
63% over limit
Discharged 5.90199995 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
70% over limit
Discharged 25.5 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
90% over limit
Discharged 15.2 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
79% over limit
Discharged 26.9 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
41% over limit
Discharged 5.13019996 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
10% over limit
Discharged 3.6 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
108% over limit
Discharged 16.6 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
77% over limit
Discharged 26.6 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
June 30, 2025
E. coli
1113% over limit
Discharged 4840 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
13% over limit
Discharged 4.11323997 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
16% over limit
Discharged 9.3 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
38% over limit
Discharged 11 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
28% over limit
Discharged 4.63079996 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
3% over limit
Discharged 0.1232 MGD against a permitted limit of 0.12 MGD (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
19% over limit
Discharged 17.9 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
9% over limit
Discharged 3.94071997 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1% over limit
Discharged 8.06 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
March 31, 2025
E. coli
1963% over limit
Discharged 2600 MPN/100mL against a permitted limit of 126 MPN/100mL (DAILY AV)
DMR, Limited - Numeric Violation
E. coli
552% over limit
Discharged 2600 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
38% over limit
Discharged 4.99399996 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
January 31, 2025
Flow, in conduit or thru treatment plant
10% over limit
Discharged 0.13245 MGD against a permitted limit of 0.12 MGD (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
16% over limit
Discharged 4.19495996 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2% over limit
Discharged 8.15 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
33% over limit
Discharged 10.6 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
30% over limit
Discharged 10.4 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2% over limit
Discharged 15.3 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, ammonia total [as N]
541% over limit
Discharged 51.3 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1253% over limit
Discharged 203 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
226% over limit
Discharged 11.8493999 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
151% over limit
Discharged 20.1 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
48% over limit
Discharged 22.2 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
39% over limit
Discharged 5.03939996 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
21% over limit
Discharged 4.40379996 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
78% over limit
Discharged 14.2 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
43% over limit
Discharged 21.5 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
July 31, 2024
Nitrogen, ammonia total [as N]
100% over limit
Discharged 16 mg/L against a permitted limit of 8 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
26% over limit
Discharged 4.58539996 kg/d against a permitted limit of 3.63199997 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
19% over limit
Discharged 17.9 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)