OAK HOLLOW WWTP
NPDES ID: TX0070297
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: 3 effluent violations, 1 single-event violation.
Violations
May 31, 2026
Oxygen, dissolved [DO]
8% over limit
Discharged 5.5 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Solids, total suspended
13% over limit
Discharged 22.6 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
April 30, 2026
Oxygen, dissolved [DO]
6% over limit
Discharged 5.62 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
March 31, 2026
Oxygen, dissolved [DO]
4% over limit
Discharged 5.77 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Solids, total suspended
62% over limit
Discharged 32.3 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
February 28, 2026
Oxygen, dissolved [DO]
1% over limit
Discharged 5.94 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
January 31, 2026
Oxygen, dissolved [DO]
5% over limit
Discharged 5.71 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Solids, total suspended
48% over limit
Discharged 29.5 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
18% over limit
Discharged 76.7 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
46% over limit
Discharged 29.2 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
4% over limit
Discharged 5.75 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
November 30, 2025
Oxygen, dissolved [DO]
3% over limit
Discharged 5.82 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
October 31, 2025
Oxygen, dissolved [DO]
13% over limit
Discharged 5.23 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
September 30, 2025
Oxygen, dissolved [DO]
15% over limit
Discharged 5.09 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
August 31, 2025
BOD, 5-day, 20 deg. C
199% over limit
Discharged 59.73 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
91% over limit
Discharged 124 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Oil & Grease
685% over limit
Discharged 4.63079996 kg/d against a permitted limit of 0.5902 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
55% over limit
Discharged 1.19401999 kg/d against a permitted limit of 0.7718 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
360% over limit
Discharged 299 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Oil & Grease
3625% over limit
Discharged 745 mg/L against a permitted limit of 20 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
141% over limit
Discharged 1.86139998 kg/d against a permitted limit of 0.7718 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
5% over limit
Discharged 5.73 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Oil & Grease
1263% over limit
Discharged 204.4 mg/L against a permitted limit of 15 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen demand, chem. [high level] [COD]
43% over limit
Discharged 285 mg/L against a permitted limit of 200 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
379% over limit
Discharged 95.7 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
July 31, 2025
Oxygen demand, chem. [high level] [COD]
50% over limit
Discharged 300 mg/L against a permitted limit of 200 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
219% over limit
Discharged 63.7 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
13% over limit
Discharged 5.25 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
Solids, total suspended
1085% over limit
Discharged 237 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
2% over limit
Discharged 66.3 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
194% over limit
Discharged 2.26999998 kg/d against a permitted limit of 0.7718 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
355% over limit
Discharged 296 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, total suspended
17% over limit
Discharged 23.3 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
70% over limit
Discharged 33.9 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
274% over limit
Discharged 243 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
355% over limit
Discharged 90.9 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
231% over limit
Discharged 66.2 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
420% over limit
Discharged 338 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Oil & Grease
87% over limit
Discharged 37.4 mg/L against a permitted limit of 20 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
3% over limit
Discharged 5.8 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total suspended
12% over limit
Discharged 0.86259999 kg/d against a permitted limit of 0.7718 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
470% over limit
Discharged 113.99 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
46% over limit
Discharged 1.13045999 kg/d against a permitted limit of 0.7718 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
203% over limit
Discharged 197 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
243% over limit
Discharged 223.07 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
362% over limit
Discharged 92.3 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen demand, chem. [high level] [COD]
8% over limit
Discharged 216.3 mg/L against a permitted limit of 200 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total suspended
19% over limit
Discharged 23.7 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
116% over limit
Discharged 43.2 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
112% over limit
Discharged 138 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, total suspended
42% over limit
Discharged 92 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
49% over limit
Discharged 29.7 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Solids, total suspended
90% over limit
Discharged 38 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, total suspended
1% over limit
Discharged 20.2 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
16% over limit
Discharged 23.2 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
15% over limit
Discharged 5.12 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
November 30, 2024
Oxygen, dissolved [DO]
13% over limit
Discharged 5.21 mg/L against a permitted limit of 6 mg/L (MO MIN)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, total suspended
13% over limit
Discharged 73.5 mg/L against a permitted limit of 65 mg/L (SINGGRAB)
DMR, Limited - Numeric Violation
Solids, total suspended
89% over limit
Discharged 37.8 mg/L against a permitted limit of 20 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)