HEIDELBERG POTW
NPDES ID: MS0040029
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 2 effluent violations.
Violations
May 31, 2026
Solids, total suspended
6% over limit
Discharged 95 mg/L against a permitted limit of 90 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.5 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
March 31, 2026
Chlorine, total residual
252% over limit
Discharged 0.19 mg/L against a permitted limit of 0.054 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
513% over limit
Discharged 0.19 mg/L against a permitted limit of 0.031 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
January 31, 2026
Chlorine, total residual
287% over limit
Discharged 0.12 mg/L against a permitted limit of 0.031 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
122% over limit
Discharged 0.12 mg/L against a permitted limit of 0.054 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MO TOTAL)
DMR, Monitor Only - Overdue
December 31, 2025
Flow, in conduit or thru treatment plant
19% over limit
Discharged 0.2548 MGD against a permitted limit of 0.215 MGD (ANNL AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Chlorine, total residual
252% over limit
Discharged 0.19 mg/L against a permitted limit of 0.054 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
513% over limit
Discharged 0.19 mg/L against a permitted limit of 0.031 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
July 31, 2025
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MO TOTAL)
DMR, Monitor Only - Overdue
May 31, 2025
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MO TOTAL)
DMR, Monitor Only - Overdue
E. coli
4% over limit
Discharged 131 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO AV)
DMR, Limited - Overdue
E. coli
4% over limit
Discharged 131 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
0% over limit
Discharged 36 mg/L against a permitted limit of 0 mg/L (MX MO AV)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 9.0889999 kg/d against a permitted limit of 0 kg/d (MO TOTAL)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 316.77399648 kg/d against a permitted limit of 0 kg/d (MO TOTAL)
DMR, Monitor Only - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.031 mg/L (MX MO AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 11 mg/L against a permitted limit of 90 mg/L (MX MO AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 11 mg/L against a permitted limit of 135 mg/L (MX WK AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 1360 mg/L against a permitted limit of 0 mg/L (MX MO AV)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.06166776 MGD against a permitted limit of 0 MGD (MO TOTAL)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 7.4 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 131 MPN/100mL against a permitted limit of 410 MPN/100mL (MX WK AV)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 14 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 14 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.054 mg/L (MX WK AV)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.4 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 2.56279997 kg/d against a permitted limit of 0 kg/d (MO TOTAL)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 3.22339997 kg/d against a permitted limit of 24.51599979 kg/d (MO TOTAL)
DMR, Limited - Overdue
April 30, 2025
Solids, total suspended
0% over limit
Discharged 23 mg/L against a permitted limit of 135 mg/L (MX WK AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0.82247999 kg/d against a permitted limit of 0 kg/d (MO TOTAL)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MO TOTAL)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 1250 mg/L against a permitted limit of 0 mg/L (MX MO AV)
DMR, Monitor Only - Overdue
E. coli
0% over limit
Discharged 27 MPN/100mL against a permitted limit of 410 MPN/100mL (MX WK AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 23 mg/L against a permitted limit of 90 mg/L (MX MO AV)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 9.80639992 kg/d against a permitted limit of 24.51599979 kg/d (MO TOTAL)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 27 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO AV)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MO TOTAL)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 45 mg/L against a permitted limit of 0 mg/L (MX MO AV)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 9 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 9 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 44.6999995 kg/d against a permitted limit of 0 kg/d (MO TOTAL)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 8.5 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.5 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
Chlorine, total residual
1548% over limit
Discharged 0.89 mg/L against a permitted limit of 0.054 mg/L (MX WK AV)
DMR, Limited - Overdue
Chlorine, total residual
1548% over limit
Discharged 0.89 mg/L against a permitted limit of 0.054 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
0% over limit
Discharged 1.60919998 kg/d against a permitted limit of 0 kg/d (MO TOTAL)
DMR, Monitor Only - Overdue
Chlorine, total residual
2771% over limit
Discharged 0.89 mg/L against a permitted limit of 0.031 mg/L (MX MO AV)
DMR, Limited - Overdue
Chlorine, total residual
2771% over limit
Discharged 0.89 mg/L against a permitted limit of 0.031 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, suspended percent removal
64% over limit
Discharged 42.5 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
0% over limit
Discharged 3.7412 MGD against a permitted limit of 0 MGD (MO TOTAL)
DMR, Monitor Only - Overdue
November 30, 2024
E. coli
477% over limit
Discharged 727 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
77% over limit
Discharged 727 MPN/100mL against a permitted limit of 410 MPN/100mL (MX WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
37% over limit
Discharged 41 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
37% over limit
Discharged 33.59599972 kg/d against a permitted limit of 24.51599979 kg/d (MO TOTAL)
DMR, Limited - Numeric Violation
Chlorine, total residual
29% over limit
Discharged 0.04 mg/L against a permitted limit of 0.031 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
September 30, 2024
pH
0% over limit
Discharged 9.5 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Chlorine, total residual
48% over limit
Discharged 0.08 mg/L against a permitted limit of 0.054 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)