BARNARD WWTF
NPDES ID: MO0041190
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 single-event violation.
Violations
March 31, 2026
Solids, total suspended
85% over limit
Discharged 148 mg/L against a permitted limit of 80 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.1 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
33% over limit
Discharged 60 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
254% over limit
Discharged 8.5 mg/L against a permitted limit of 2.4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
23% over limit
Discharged 148 mg/L against a permitted limit of 120 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
83% over limit
Discharged 36 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1% over limit
Discharged 8.5 mg/L against a permitted limit of 8.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
1088% over limit
Discharged 28.5 mg/L against a permitted limit of 2.4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
49% over limit
Discharged 307 MPN/100mL against a permitted limit of 206 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
239% over limit
Discharged 28.5 mg/L against a permitted limit of 8.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, suspended percent removal
17% over limit
Discharged 59 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
E. coli
179% over limit
Discharged 575 MPN/100mL against a permitted limit of 206 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1267% over limit
Discharged 12.3 mg/L against a permitted limit of 0.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
78% over limit
Discharged 12.3 mg/L against a permitted limit of 6.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, suspended percent removal
119% over limit
Discharged 23.2 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
E. coli
48% over limit
Discharged 304 MPN/100mL against a permitted limit of 206 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, suspended percent removal
26% over limit
Discharged 56 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
583% over limit
Discharged 16.4 mg/L against a permitted limit of 2.4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
95% over limit
Discharged 16.4 mg/L against a permitted limit of 8.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
186% over limit
Discharged 0 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
56% over limit
Discharged 13.1 mg/L against a permitted limit of 8.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
446% over limit
Discharged 13.1 mg/L against a permitted limit of 2.4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
103% over limit
Discharged 29 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
September 30, 2024
E. coli
57% over limit
Discharged 1615 MPN/100mL against a permitted limit of 1030 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
177% over limit
Discharged 19.1 mg/L against a permitted limit of 6.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2022% over limit
Discharged 19.1 mg/L against a permitted limit of 0.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
684% over limit
Discharged 1615 MPN/100mL against a permitted limit of 206 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)