LONE STAR WWTP
NPDES ID: TX0088081
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: 2 effluent violations.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
5% over limit
Discharged 15.7 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
37% over limit
Discharged 4.11 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, carbonaceous [5 day, 20 C]
46% over limit
Discharged 14.6 mg/L against a permitted limit of 10 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
17% over limit
Discharged 17.6 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
112% over limit
Discharged 31.8 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
160% over limit
Discharged 7.8 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
1% over limit
Discharged 35.5 mg/L against a permitted limit of 35 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
171% over limit
Discharged 40.7 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
152% over limit
Discharged 7.55 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
90% over limit
Discharged 5.7 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 15.5 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
117% over limit
Discharged 130 mg/L against a permitted limit of 60 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
269% over limit
Discharged 55.3 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
November 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
Nitrogen, ammonia total [as N]
8% over limit
Discharged 3.24 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
230% over limit
Discharged 9.9 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
51% over limit
Discharged 22.7 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, total suspended
24% over limit
Discharged 18.6 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 4.48 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
0% over limit
Discharged 14.2 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Overdue
pH
0% over limit
Discharged 6.88 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 2 mg/L against a permitted limit of 35 mg/L (SINGGRAB)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 126 MPN/100mL (DAILY AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.1 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Overdue
Chlorine, total residual
10% over limit
Discharged 0.9 mg/L against a permitted limit of 1 mg/L (MO MIN)
DMR, Limited - Overdue
Chlorine, total residual
10% over limit
Discharged 0.9 mg/L against a permitted limit of 1 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
0% over limit
Discharged 0.49486 kg/d against a permitted limit of 0 kg/d (DAILY AV)
DMR, Monitor Only - Overdue
Chlorine, total residual
0% over limit
Discharged 3.5 mg/L against a permitted limit of 4 mg/L (MO MAX)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0.76271999 kg/d against a permitted limit of 16.798 kg/d (DAILY AV)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 2 mg/L against a permitted limit of 0 mg/L (SINGGRAB)
DMR, Monitor Only - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 6.09 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 2 mg/L against a permitted limit of 10 mg/L (DAILY AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.04086 kg/d against a permitted limit of 4.994 kg/d (DAILY AV)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 1.31 mg/L against a permitted limit of 0 mg/L (DAILY AV)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.339 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 4.27 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 4.27 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 16.3 mg/L against a permitted limit of 60 mg/L (SINGGRAB)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.1 MGD against a permitted limit of 0.44 MGD (DAILY AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 5.26639996 kg/d against a permitted limit of 24.97 kg/d (DAILY AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.1 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Overdue
April 30, 2025
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.10896 kg/d against a permitted limit of 4.994 kg/d (DAILY AV)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 6.01 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Overdue
Chlorine, total residual
10% over limit
Discharged 0.9 mg/L against a permitted limit of 1 mg/L (MO MIN)
DMR, Limited - Overdue
Chlorine, total residual
10% over limit
Discharged 0.9 mg/L against a permitted limit of 1 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.71 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.443 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 3.4 mg/L against a permitted limit of 35 mg/L (SINGGRAB)
DMR, Limited - Overdue
pH
0% over limit
Discharged 6.37 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.74909999 kg/d against a permitted limit of 0 kg/d (DAILY AV)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.01 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 6.40139995 kg/d against a permitted limit of 24.97 kg/d (DAILY AV)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 1.72 mg/L against a permitted limit of 0 mg/L (SINGGRAB)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 37 mg/L against a permitted limit of 60 mg/L (SINGGRAB)
DMR, Limited - Overdue
Solids, total suspended
1% over limit
Discharged 15.1 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Overdue
Solids, total suspended
1% over limit
Discharged 15.1 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 1.53451999 kg/d against a permitted limit of 16.798 kg/d (DAILY AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.298 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.13 MGD against a permitted limit of 0.44 MGD (DAILY AV)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 1.28 mg/L against a permitted limit of 0 mg/L (DAILY AV)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 2.9 mg/L against a permitted limit of 10 mg/L (DAILY AV)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 126 MPN/100mL (DAILY AV)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 1.8 mg/L against a permitted limit of 4 mg/L (MO MAX)
DMR, Limited - Overdue
March 31, 2025
Solids, total suspended
0% over limit
Discharged 18.8 mg/L against a permitted limit of 60 mg/L (SINGGRAB)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.111 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 8.64 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 126 MPN/100mL (DAILY AV)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 1.38 mg/L against a permitted limit of 0 mg/L (DAILY AV)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 7.6 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 2.42 mg/L against a permitted limit of 0 mg/L (SINGGRAB)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 2.4 mg/L against a permitted limit of 35 mg/L (SINGGRAB)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.33142 kg/d against a permitted limit of 4.994 kg/d (DAILY AV)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 1.1 mg/L against a permitted limit of 1 mg/L (MO MIN)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.070182 MGD against a permitted limit of 0.44 MGD (DAILY AV)
DMR, Limited - Overdue
pH
0% over limit
Discharged 6.21 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 3.28241997 kg/d against a permitted limit of 24.97 kg/d (DAILY AV)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.26332 kg/d against a permitted limit of 0 kg/d (DAILY AV)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0.52664 kg/d against a permitted limit of 16.798 kg/d (DAILY AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 13.4 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 4 mg/L against a permitted limit of 4 mg/L (MO MAX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 7.21 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 2.2 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 2.2 mg/L against a permitted limit of 10 mg/L (DAILY AV)
DMR, Limited - Overdue
February 28, 2025
Solids, total suspended
73% over limit
Discharged 26 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, total suspended
83% over limit
Discharged 27.4 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
118% over limit
Discharged 6.54 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, total suspended
47% over limit
Discharged 22.1 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
46% over limit
Discharged 4.39 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
July 31, 2024
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.641 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 3.2 mg/L against a permitted limit of 10 mg/L (DAILY AV)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 126 MPN/100mL (DAILY AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 7.3 mg/L against a permitted limit of 15 mg/L (SINGGRAB)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.1215 MGD against a permitted limit of 0.44 MGD (DAILY AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 1.95219998 kg/d against a permitted limit of 4.994 kg/d (DAILY AV)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 1.91 mg/L against a permitted limit of 0 mg/L (DAILY AV)
DMR, Monitor Only - Overdue
Chlorine, total residual
0% over limit
Discharged 3.6 mg/L against a permitted limit of 4 mg/L (MO MAX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 10.2 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 2.87 mg/L against a permitted limit of 0 mg/L (SINGGRAB)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
27% over limit
Discharged 3.8 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
27% over limit
Discharged 3.8 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 19.5 mg/L against a permitted limit of 60 mg/L (SINGGRAB)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 5.35719995 kg/d against a permitted limit of 24.97 kg/d (DAILY AV)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 1.72519999 kg/d against a permitted limit of 16.798 kg/d (DAILY AV)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 6.2 mg/L against a permitted limit of 35 mg/L (SINGGRAB)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.81719999 kg/d against a permitted limit of 0 kg/d (DAILY AV)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 1.1 mg/L against a permitted limit of 1 mg/L (MO MIN)
DMR, Limited - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)