WEST HARRIS COUNTY MUD 21 WWTP
NPDES ID: TX0109126
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: 9 effluent violations.
Violations
June 30, 2026
Flow, in conduit or thru treatment plant
15% over limit
Discharged 0.288 MGD against a permitted limit of 0.25 MGD (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
21% over limit
Discharged 16.97959986 kg/d against a permitted limit of 14.07399988 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
May 31, 2026
Chlorine, total residual
10% over limit
Discharged 4.4 mg/L against a permitted limit of 4 mg/L (MO MAX)
DMR, Limited - Numeric Violation
Solids, total suspended
142% over limit
Discharged 34.04999971 kg/d against a permitted limit of 14.07399988 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
75% over limit
Discharged 26.3 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
10% over limit
Discharged 0.274 MGD against a permitted limit of 0.25 MGD (DAILY AV)
DMR, Limited - Numeric Violation
April 30, 2026
pH
0% over limit
Discharged 5.76 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
Solids, total suspended
35% over limit
Discharged 20.3 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
29% over limit
Discharged 18.20539985 kg/d against a permitted limit of 14.07399988 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total suspended
31% over limit
Discharged 19.6 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
14% over limit
Discharged 15.98079987 kg/d against a permitted limit of 14.07399988 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
9% over limit
Discharged 16.3 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
6% over limit
Discharged 14.93659987 kg/d against a permitted limit of 14.07399988 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
11% over limit
Discharged 16.7 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
August 31, 2025
E. coli
131% over limit
Discharged 461 MPN/100mL against a permitted limit of 200 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
5% over limit
Discharged 15.8 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
4% over limit
Discharged 14.57339988 kg/d against a permitted limit of 14.074 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total suspended
17% over limit
Discharged 17.6 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
67% over limit
Discharged 100 mg/L against a permitted limit of 60 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, total suspended
12% over limit
Discharged 67 mg/L against a permitted limit of 60 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
75% over limit
Discharged 26.3 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
32% over limit
Discharged 18.61399984 kg/d against a permitted limit of 14.074 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
22% over limit
Discharged 18.3 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
45% over limit
Discharged 21.7 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
November 30, 2024
Solids, total suspended
37% over limit
Discharged 82 mg/L against a permitted limit of 60 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
28% over limit
Discharged 19.2 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
August 31, 2024
E. coli
174% over limit
Discharged 548 MPN/100mL against a permitted limit of 200 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 16, 2026 (1 hour ago)