ROBSTOWN WWTF
NPDES ID: TX0020389
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
This quarter: 4 effluent violations, 1 single-event violation, 12 reporting violations.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
60% over limit
Discharged 16 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
66% over limit
Discharged 16.55 mg/L against a permitted limit of 10 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
69% over limit
Discharged 42.2 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
110% over limit
Discharged 6.285 mg/L against a permitted limit of 3 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
March 31, 2026
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (48HR MIN)
DMR, Monitor Only - Overdue
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex
0% over limit
Discharged 0 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO AV MN)
DMR, Monitor Only - Overdue
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO AV MN)
DMR, Monitor Only - Overdue
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (48HR MIN)
DMR, Monitor Only - Overdue
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex
0% over limit
Discharged 0 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
January 31, 2026
Cyanide, free [amenable to chlorination]
107% over limit
Discharged 0.17 mg/L against a permitted limit of 0.082 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
BOD, carbonaceous [5 day, 20 C]
56% over limit
Discharged 38.9 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
BOD, carbonaceous [5 day, 20 C]
16% over limit
Discharged 29 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex
0% over limit
Discharged 100 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (48HR MIN)
DMR, Monitor Only - Overdue
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex
0% over limit
Discharged 100 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (48HR MIN)
DMR, Monitor Only - Overdue
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO AV MN)
DMR, Monitor Only - Overdue
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas
0% over limit
Discharged 100 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex
0% over limit
Discharged 0 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO AV MN)
DMR, Monitor Only - Overdue
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas
0% over limit
Discharged 100 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
June 30, 2025
BOD, carbonaceous [5 day, 20 C]
Limit violation
Discharged 37.6 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO AV MN)
DMR, Monitor Only - Overdue
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO AV MN)
DMR, Monitor Only - Overdue
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas
0% over limit
Discharged 100 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex
0% over limit
Discharged 0 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (48HR MIN)
DMR, Monitor Only - Overdue
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (48HR MIN)
DMR, Monitor Only - Overdue
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex
0% over limit
Discharged 100 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex
0% over limit
Discharged 100 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO AV MN)
DMR, Monitor Only - Overdue
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas
0% over limit
Discharged 100 % against a permitted limit of 0 % (48HR MIN)
DMR, Monitor Only - Overdue
December 31, 2024
BOD, carbonaceous [5 day, 20 C]
24% over limit
Discharged 31.1 mg/L against a permitted limit of 25 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
E. coli
537% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 380 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2024
E. coli
242% over limit
Discharged 1299.7 MPN/100mL against a permitted limit of 380 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, free [amenable to chlorination]
132% over limit
Discharged 0.19 mg/L against a permitted limit of 0.082 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)