DIERKS, CITY OF - DIERKS WASTEWATER TREATMENT FACILITY
NPDES ID: AR0021709
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: 5 effluent violations.
Violations
May 31, 2026
Solids, total suspended
47% over limit
Discharged 22 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
74% over limit
Discharged 22.74085981 kg/d against a permitted limit of 13.07519989 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
7% over limit
Discharged 24 mg/L against a permitted limit of 22.5 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
71% over limit
Discharged 29.75515975 kg/d against a permitted limit of 17.43359985 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
10% over limit
Discharged 33 mg/L against a permitted limit of 30 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
10% over limit
Discharged 7.67259994 kg/d against a permitted limit of 6.94619994 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
51% over limit
Discharged 26.25481978 kg/d against a permitted limit of 17.43359985 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
24% over limit
Discharged 21.70119982 kg/d against a permitted limit of 17.43359985 kg/d (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
78% over limit
Discharged 31.05359974 kg/d against a permitted limit of 17.43359985 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
18% over limit
Discharged 23.5 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
28% over limit
Discharged 38.5 mg/L against a permitted limit of 30 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Solids, total suspended
56% over limit
Discharged 31.25 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
51% over limit
Discharged 26.29567978 kg/d against a permitted limit of 17.43359985 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
12% over limit
Discharged 33.5 mg/L against a permitted limit of 30 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
2% over limit
Discharged 23 mg/L against a permitted limit of 22.5 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
20% over limit
Discharged 18 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
5% over limit
Discharged 15.8 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
25% over limit
Discharged 16.40301986 kg/d against a permitted limit of 13.07519989 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, total suspended
41% over limit
Discharged 24.61133979 kg/d against a permitted limit of 17.43359985 kg/d (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Coliform, fecal, colony forming units
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
November 30, 2024
Coliform, fecal, colony forming units
29% over limit
Discharged 1292 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal, colony forming units
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
6% over limit
Discharged 18.53681984 kg/d against a permitted limit of 17.43359985 kg/d (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Coliform, fecal, colony forming units
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal, colony forming units
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)