CITY OF MERKEL WWTP
NPDES ID: TX0111341
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
Oxygen, dissolved [DO]
100% over limit
Discharged 0.01 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Solids, total suspended
1% over limit
Discharged 90.75 mg/L against a permitted limit of 90 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
6% over limit
Discharged 95.56 mg/L against a permitted limit of 90 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
40% over limit
Discharged 139.6 mg/L against a permitted limit of 100 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
E. coli
289% over limit
Discharged 1553.1 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
98% over limit
Discharged 0.1 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
E. coli
19% over limit
Discharged 149.37 MPN/100mL against a permitted limit of 126 MPN/100mL (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
148% over limit
Discharged 74.28 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
March 31, 2026
Oxygen, dissolved [DO]
98% over limit
Discharged 0.1 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
33% over limit
Discharged 39.95 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
February 28, 2026
Oxygen, dissolved [DO]
73% over limit
Discharged 1.1 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
January 31, 2026
BOD, 5-day, 20 deg. C
3% over limit
Discharged 102.5 mg/L against a permitted limit of 100 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
19% over limit
Discharged 35.75 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
2% over limit
Discharged 92.13 mg/L against a permitted limit of 90 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2025
Oxygen, dissolved [DO]
25% over limit
Discharged 3 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
26% over limit
Discharged 37.66 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
November 30, 2025
BOD, 5-day, 20 deg. C
33% over limit
Discharged 39.75 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
1% over limit
Discharged 91 mg/L against a permitted limit of 90 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
78% over limit
Discharged 0.9 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
October 31, 2025
Oxygen, dissolved [DO]
8% over limit
Discharged 3.7 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Solids, total suspended
55% over limit
Discharged 139.2 mg/L against a permitted limit of 90 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
September 30, 2025
Oxygen, dissolved [DO]
55% over limit
Discharged 1.8 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Solids, total suspended
44% over limit
Discharged 130 mg/L against a permitted limit of 90 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
9% over limit
Discharged 32.73 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
August 31, 2025
BOD, 5-day, 20 deg. C
4% over limit
Discharged 31.33 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
100% over limit
Discharged 0 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
July 31, 2025
Oxygen, dissolved [DO]
70% over limit
Discharged 1.2 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
5% over limit
Discharged 31.44 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
15% over limit
Discharged 103.2 mg/L against a permitted limit of 90 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
June 30, 2025
E. coli
226% over limit
Discharged 1299.7 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
43% over limit
Discharged 43 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
36% over limit
Discharged 49.25445959 kg/d against a permitted limit of 36.32 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
March 31, 2025
Oxygen, dissolved [DO]
68% over limit
Discharged 1.3 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
February 28, 2025
E. coli
3% over limit
Discharged 411 MPN/100mL against a permitted limit of 399 MPN/100mL (SINGGRAB)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
50% over limit
Discharged 44.88 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
January 31, 2025
BOD, 5-day, 20 deg. C
13% over limit
Discharged 34.02 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2024
BOD, 5-day, 20 deg. C
37% over limit
Discharged 41.05 mg/L against a permitted limit of 30 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
August 31, 2024
Oxygen, dissolved [DO]
48% over limit
Discharged 2.1 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Solids, total suspended
1% over limit
Discharged 91.34 mg/L against a permitted limit of 90 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
July 31, 2024
Solids, total suspended
2% over limit
Discharged 92 mg/L against a permitted limit of 90 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
13% over limit
Discharged 3.5 mg/L against a permitted limit of 4 mg/L (MO MIN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)