SIMLA WWTF
NPDES ID: COG591031
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.
Violations
May 31, 2026
BOD, 5-day, percent removal
3% over limit
Discharged 84.5 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
April 30, 2026
BOD, 5-day, 20 deg. C
70% over limit
Discharged 51 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
13% over limit
Discharged 51 mg/L against a permitted limit of 45 mg/L (MX 7D AV)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
12% over limit
Discharged 84 mg/L against a permitted limit of 75 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
30% over limit
Discharged 39 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
BOD, 5-day, 20 deg. C
57% over limit
Discharged 47 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
4% over limit
Discharged 47 mg/L against a permitted limit of 45 mg/L (MX 7D AV)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
1% over limit
Discharged 84.9 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
5% over limit
Discharged 33.6 mg/L against a permitted limit of 32 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
5% over limit
Discharged 33.6 mg/L against a permitted limit of 32 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, 5-day, percent removal
3% over limit
Discharged 84.5 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Sulfate
9% over limit
Discharged 272 mg/L against a permitted limit of 250 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Sulfate
10% over limit
Discharged 274 mg/L against a permitted limit of 250 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2024
TU Static Renewal 7-Day Chronic Pimphales promelas
0% over limit
Discharged 0 toxic against a permitted limit of 0 toxic (SINGSAMP)
DMR, Monitor Only - Overdue
E. coli
284% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 630 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia
0% over limit
Discharged 0 toxic against a permitted limit of 0 toxic (SINGSAMP)
DMR, Monitor Only - Overdue
Sulfate
8% over limit
Discharged 270 mg/L against a permitted limit of 250 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia
0% over limit
Discharged 0 toxic against a permitted limit of 0 toxic (MN VALUE)
DMR, Monitor Only - Overdue
Chloride [as Cl]
1% over limit
Discharged 252 mg/L against a permitted limit of 250 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
TU Static Renewal 7-Day Chronic Pimphales promelas
0% over limit
Discharged 0 toxic against a permitted limit of 0 toxic (MN VALUE)
DMR, Monitor Only - Overdue
E. coli
92% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 1260 MPN/100mL (MX 7D GM)
DMR, Limited - Numeric Violation
October 31, 2024
Sulfate
0% over limit
Discharged 0 mg/L against a permitted limit of 250 mg/L (30DA AVG)
DMR, Limited - 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 32 mg/L (30DA AVG)
DMR, Limited - Overdue
Nitrogen, inorganic total
0% over limit
Discharged 0 mg/L against a permitted limit of 51 mg/L (DAILY MX)
DMR, Limited - Overdue
Selenium, potentially dissolvd
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0184 mg/L (DAILY MX)
DMR, Limited - Overdue
Selenium, potentially dissolvd
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (30DA AVG)
DMR, Limited - Overdue
Manganese, dissolved [as Mn]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.071 mg/L (30DA AVG)
DMR, Limited - Overdue
Sulfide-hydrogen sulfide [undissociated]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.002 mg/L (30DA AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 32 mg/L (DAILY MX)
DMR, Limited - Overdue
Chloride [as Cl]
0% over limit
Discharged 0 mg/L against a permitted limit of 250 mg/L (30DA AVG)
DMR, Limited - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)