CARLTON STP
NPDES ID: OR0020541
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
March 31, 2026
BOD, 5-day, 20 deg. C
61% over limit
Discharged 100.74259915 kg/d against a permitted limit of 62.65199947 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
105% over limit
Discharged 85.57899928 kg/d against a permitted limit of 41.76799965 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
21% over limit
Discharged 100.74259915 kg/d against a permitted limit of 83.5359993 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
0% over limit
Discharged 23.8803998 kg/d against a permitted limit of 103.96599913 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 30.41799974 kg/d against a permitted limit of 41.76799965 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 36.91019969 kg/d against a permitted limit of 62.65199947 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 17 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 36.91019969 kg/d against a permitted limit of 83.5359993 kg/d (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 23.8803998 kg/d against a permitted limit of 138.92399883 kg/d (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 229.7 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 20.15759983 kg/d against a permitted limit of 69.46199942 kg/d (MO AVG)
DMR, Limited - Overdue
January 31, 2026
BOD, 5-day, 20 deg. C
0% over limit
Discharged 8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 16.34399986 kg/d against a permitted limit of 41.76799965 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 20.11219983 kg/d against a permitted limit of 138.92399883 kg/d (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 23.2901998 kg/d against a permitted limit of 83.5359993 kg/d (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 15.20899987 kg/d against a permitted limit of 69.46199942 kg/d (MO AVG)
DMR, Limited - Overdue
December 31, 2025
BOD, 5-day, 20 deg. C
0% over limit
Discharged 51.66519957 kg/d against a permitted limit of 62.65199947 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 31.18979974 kg/d against a permitted limit of 41.76799965 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 51.66519957 kg/d against a permitted limit of 83.5359993 kg/d (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 26 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
November 30, 2025
Solids, total suspended
0% over limit
Discharged 54 mg/L against a permitted limit of 80 mg/L (WKLY AVG)
DMR, Limited - Overdue
Solids, total suspended
31% over limit
Discharged 91.25399923 kg/d against a permitted limit of 69.46199942 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
31% over limit
Discharged 91.25399923 kg/d against a permitted limit of 69.46199942 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 102.24079914 kg/d against a permitted limit of 103.96599913 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 40 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
21% over limit
Discharged 75.72719936 kg/d against a permitted limit of 62.65199947 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
21% over limit
Discharged 75.72719936 kg/d against a permitted limit of 62.65199947 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
63% over limit
Discharged 67.96379943 kg/d against a permitted limit of 41.76799965 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
63% over limit
Discharged 67.96379943 kg/d against a permitted limit of 41.76799965 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 47 mg/L against a permitted limit of 50 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
17% over limit
Discharged 35 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
17% over limit
Discharged 35 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEO)
DMR, Limited - Overdue
BOD, 5-day, percent removal
11% over limit
Discharged 83.3 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 0 MPN/100mL (DAILY MX)
DMR, Monitor Only - Overdue
February 28, 2025
Solids, suspended percent removal
55% over limit
Discharged 45.7 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
5% over limit
Discharged 84.2 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
January 31, 2025
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0.90799999 kg/d against a permitted limit of 83.5359993 kg/d (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0.90799999 kg/d against a permitted limit of 62.65199947 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 2 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 2 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0.90799999 kg/d against a permitted limit of 41.76799965 kg/d (MO AVG)
DMR, Limited - Overdue
December 31, 2024
BOD, 5-day, 20 deg. C
0% over limit
Discharged 14.89119987 kg/d against a permitted limit of 83.5359993 kg/d (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 7.7 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 22 mg/L against a permitted limit of 80 mg/L (WKLY AVG)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 0 MPN/100mL (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 14.89119987 kg/d against a permitted limit of 41.76799965 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 13 mg/L against a permitted limit of 50 mg/L (MO AVG)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEO)
DMR, Limited - Overdue
BOD, 5-day, percent removal
0% over limit
Discharged 91.8 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.04 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.04 mg/L against a permitted limit of 0.1 mg/L (DAILY MX)
DMR, Limited - Overdue
November 30, 2024
Solids, suspended percent removal
3% over limit
Discharged 64.1 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
567% over limit
Discharged 0 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
August 31, 2024
pH
0% over limit
Discharged 6.85 SU against a permitted limit of 0 SU (DAILY MN)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 7.02 SU against a permitted limit of 0 SU (DAILY MX)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)