ARMSTRONG WWTF
NPDES ID: MO0093084
D — SNC: Discharge monitoring report not received
The facility didn't submit its required discharge monitoring report.
This quarter: 4 effluent violations, 1 single-event violation, 16 reporting violations.
Violations
June 30, 2026
BOD, 5-day, percent removal
186% over limit
Discharged 0 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
E. coli
26% over limit
Discharged 260 MPN/100mL against a permitted limit of 206 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
39% over limit
Discharged 2.5 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
186% over limit
Discharged 0 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.686 mg/L against a permitted limit of 2.7 mg/L (MO AVG)
DMR, Limited - Overdue
Oil and grease [soxhlet extr.] tot.
0% over limit
Discharged 5 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 23.9 mg/L against a permitted limit of 110 mg/L (WKLY AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.0076 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 9.36 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 9.36 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 9.36 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
0% over limit
Discharged 37 mg/L against a permitted limit of 65 mg/L (WKLY AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 191 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 23.9 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 37 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 132 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, percent removal
0% over limit
Discharged 71.2 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.686 mg/L against a permitted limit of 10.1 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, suspended percent removal
0% over limit
Discharged 87.4 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.0076 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Oil and grease [soxhlet extr.] tot.
0% over limit
Discharged 5 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
December 31, 2025
Nitrogen, ammonia total [as N]
271% over limit
Discharged 11.5 mg/L against a permitted limit of 3.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
126% over limit
Discharged 21 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 206 MPN/100mL (30DA GM)
DMR, Limited - Overdue
BOD, 5-day, percent removal
71% over limit
Discharged 40 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 1030 MPN/100mL (7 DA GEO)
DMR, Limited - Overdue
March 31, 2025
Nitrogen, ammonia total [as N]
89% over limit
Discharged 5.09 mg/L against a permitted limit of 2.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
E. coli
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1030 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
245% over limit
Discharged 10.7 mg/L against a permitted limit of 3.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 206 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
51% over limit
Discharged 47 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
September 30, 2024
Solids, total suspended
404% over limit
Discharged 352.7 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
161% over limit
Discharged 3.39 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 206 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
E. coli
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1030 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
34% over limit
Discharged 53 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (5 hours ago)