RIVERBEND SUBDIVISION
NPDES ID: COG590006
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: 1 effluent violation.
Violations
May 31, 2026
Arsenic, total recoverable
5900% over limit
Discharged 0.0012 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Arsenic, total recoverable
5400% over limit
Discharged 0.0011 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
20% over limit
Discharged 10.8 deg C against a permitted limit of 9 deg C (MX WK AV)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, 5-day, 20 deg. C
13% over limit
Discharged 34 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
40% over limit
Discharged 63 mg/L against a permitted limit of 45 mg/L (MX 7D AV)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
17% over limit
Discharged 10.5 deg C against a permitted limit of 9 deg C (MX WK AV)
DMR, Limited - Numeric Violation
January 31, 2026
Temperature, water deg. centigrade
14% over limit
Discharged 10.3 deg C against a permitted limit of 9 deg C (MX WK AV)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
3400% over limit
Discharged 0.0007 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Arsenic, total recoverable
5900% over limit
Discharged 0.0012 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
32% over limit
Discharged 17.1 deg C against a permitted limit of 13 deg C (DAILY MX)
DMR, Limited - Overdue
Temperature, water deg. centigrade
32% over limit
Discharged 17.1 deg C against a permitted limit of 13 deg C (DAILY MX)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
80% over limit
Discharged 16.2 deg C against a permitted limit of 9 deg C (MX WK AV)
DMR, Limited - Overdue
Temperature, water deg. centigrade
80% over limit
Discharged 16.2 deg C against a permitted limit of 9 deg C (MX WK AV)
DMR, Limited - Numeric Violation
November 30, 2025
Arsenic, total recoverable
4900% over limit
Discharged 0.001 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Arsenic, total recoverable
3900% over limit
Discharged 0.0008 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Arsenic, total recoverable
5900% over limit
Discharged 0.0012 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Arsenic, total recoverable
5400% over limit
Discharged 0.0011 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
12% over limit
Discharged 20.5 deg C against a permitted limit of 18.3 deg C (MX WK AV)
DMR, Limited - Numeric Violation
July 31, 2025
Arsenic, total recoverable
6400% over limit
Discharged 0.0013 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
9% over limit
Discharged 20 deg C against a permitted limit of 18.3 deg C (MX WK AV)
DMR, Limited - Numeric Violation
April 30, 2025
BOD, 5-day, 20 deg. C
17% over limit
Discharged 35 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2024
BOD, 5-day, 20 deg. C
0% over limit
Discharged 157 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Oil and grease
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (INST MAX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 7 mg/L against a permitted limit of 110 mg/L (MX 7D AV)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4.53999996 kg/d against a permitted limit of 0 kg/d (30DA AVG)
DMR, Monitor Only - Overdue
Chloride [as Cl]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Sulfate
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 220 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 157 mg/L against a permitted limit of 0 mg/L (MX 7D AV)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.009 MGD against a permitted limit of 0.0247 MGD (30DA AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.7 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Solids, total dissolved
0% over limit
Discharged 1053 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4.53999996 kg/d against a permitted limit of 0 kg/d (MX 7D AV)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 13 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 4000 MPN/100mL (MX 7D GM)
DMR, Limited - Overdue
Solids, total dissolved
0% over limit
Discharged 1203 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 2000 MPN/100mL (30DA GM)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 13 mg/L against a permitted limit of 45 mg/L (MX 7D AV)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.009 MGD against a permitted limit of 0 MGD (30DA AVG)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.011 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.13 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, percent removal
0% over limit
Discharged 92 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Solids, total dissolved
0% over limit
Discharged 1053 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 220 mg/L against a permitted limit of 0 mg/L (MX 7D AV)
DMR, Monitor Only - Overdue
Sulfide-hydrogen sulfide [undissociated]
0% over limit
Discharged 0.1 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Oil and grease visual
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (INST MAX)
DMR, Monitor Only - Overdue
Plant capacity fact. percent of capacity
0% over limit
Discharged 38 % against a permitted limit of 0 % (30DA AVG)
DMR, Monitor Only - Overdue
Plant capacity fact. percent of capacity
0% over limit
Discharged 26 % against a permitted limit of 0 % (30DA AVG)
DMR, Monitor Only - Overdue
Chlorine, total residual
0% over limit
Discharged 0.36 mg/L against a permitted limit of 0.5 mg/L (INST MAX)
DMR, Limited - Overdue
Nitrogen, nitrite total [as N]
0% over limit
Discharged 0.404 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.13 mg/L against a permitted limit of 50 mg/L (30DA AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.5 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.011 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 7 mg/L against a permitted limit of 75 mg/L (30DA AVG)
DMR, Limited - Overdue
Solids, total dissolved
0% over limit
Discharged 1203 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Arsenic, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
August 31, 2024
BOD, 5-day, 20 deg. C
0% over limit
Discharged 1 mg/L against a permitted limit of 45 mg/L (MX 7D AV)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.011 MGD against a permitted limit of 0 MGD (30DA AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 5.81 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Overdue
Oil and grease visual
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (INST MAX)
DMR, Monitor Only - Overdue
BOD, 5-day, percent removal
0% over limit
Discharged 99 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.011 MGD against a permitted limit of 0.0247 MGD (30DA AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 236 mg/L against a permitted limit of 0 mg/L (MX 7D AV)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 1 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 2000 MPN/100mL (30DA GM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.7 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Plant capacity fact. percent of capacity
0% over limit
Discharged 59 % against a permitted limit of 0 % (30DA AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 5.81 mg/L against a permitted limit of 50 mg/L (30DA AVG)
DMR, Limited - Overdue
Sulfate
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Sulfide-hydrogen sulfide [undissociated]
0% over limit
Discharged 0.5 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 9 mg/L against a permitted limit of 110 mg/L (MX 7D AV)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 203 mg/L against a permitted limit of 0 mg/L (MX 7D AV)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 10.89599991 kg/d against a permitted limit of 0 kg/d (30DA AVG)
DMR, Monitor Only - Overdue
Chlorine, total residual
0% over limit
Discharged 0.36 mg/L against a permitted limit of 0.5 mg/L (INST MAX)
DMR, Limited - Overdue
Plant capacity fact. percent of capacity
0% over limit
Discharged 46 % against a permitted limit of 0 % (30DA AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 7.5 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.016 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 9 mg/L against a permitted limit of 75 mg/L (30DA AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 10.89599991 kg/d against a permitted limit of 0 kg/d (MX 7D AV)
DMR, Monitor Only - Overdue
Chloride [as Cl]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.016 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 236 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
E. coli
0% over limit
Discharged 1 MPN/100mL against a permitted limit of 4000 MPN/100mL (MX 7D GM)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 203 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Arsenic, total recoverable
0% over limit
Discharged 4.5e-7 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Oil and grease
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (INST MAX)
DMR, Limited - Overdue
Nitrogen, nitrite total [as N]
0% over limit
Discharged 0.707 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
July 31, 2024
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (INST MAX)
DMR, Limited - Overdue
Sulfate
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Arsenic, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Plant capacity fact. percent of capacity
0% over limit
Discharged 0 % against a permitted limit of 0 % (30DA AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, percent removal
0% over limit
Discharged 0 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Oil and grease visual
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (INST MAX)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (30DA AVG)
DMR, Monitor Only - Overdue
Plant capacity fact. percent of capacity
0% over limit
Discharged 0 % against a permitted limit of 0 % (30DA AVG)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0.0247 MGD (30DA AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (30DA AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 45 mg/L (MX 7D AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 110 mg/L (MX 7D AV)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 4000 MPN/100mL (MX 7D GM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MX 7D AV)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 75 mg/L (30DA AVG)
DMR, Limited - Overdue
Oil and grease
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (INST MAX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MX 7D AV)
DMR, Monitor Only - Overdue
Chloride [as Cl]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Nitrogen, nitrite total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 50 mg/L (30DA AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 2000 MPN/100mL (30DA GM)
DMR, Limited - Overdue
Sulfide-hydrogen sulfide [undissociated]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MX 7D AV)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)