PATUXENT MHC, LLC
NPDES ID: MD0024694
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.
Violations
February 28, 2026
Oxygen, dissolved [DO]
12% over limit
Discharged 4.4 mg/L against a permitted limit of 5 mg/L (INST MIN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
113% over limit
Discharged 64 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
151% over limit
Discharged 113 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
110% over limit
Discharged 63 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
627% over limit
Discharged 916 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMX)
DMR, Limited - Numeric Violation
Solids, total suspended
304% over limit
Discharged 182 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
15% over limit
Discharged 6.80999994 kg/d against a permitted limit of 5.90199995 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
January 31, 2026
BOD, 5-day, 20 deg. C
110% over limit
Discharged 63 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
37% over limit
Discharged 41 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
130% over limit
Discharged 290 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMX)
DMR, Limited - Numeric Violation
December 31, 2025
Oxygen, dissolved [DO]
14% over limit
Discharged 4.3 mg/L against a permitted limit of 5 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
August 31, 2025
BOD, 5-day, 20 deg. C
33% over limit
Discharged 60 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
E. coli
437% over limit
Discharged 676 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
17% over limit
Discharged 35 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
June 30, 2025
E. coli
2% over limit
Discharged 128 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
3% over limit
Discharged 31 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
51% over limit
Discharged 68 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
108% over limit
Discharged 12.2579999 kg/d against a permitted limit of 5.90199995 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
197% over limit
Discharged 89 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
522% over limit
Discharged 280 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
E. coli
22% over limit
Discharged 154 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMX)
DMR, Limited - Numeric Violation
April 30, 2025
E. coli
10% over limit
Discharged 139 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.3 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Numeric Violation
March 31, 2025
E. coli
746% over limit
Discharged 1066 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMX)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, 5-day, 20 deg. C
67% over limit
Discharged 50 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
144% over limit
Discharged 110 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
E. coli
435% over limit
Discharged 674 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMX)
DMR, Limited - Numeric Violation
January 31, 2025
BOD, 5-day, 20 deg. C
7% over limit
Discharged 48 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
18% over limit
Discharged 4.1 mg/L against a permitted limit of 5 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
November 30, 2024
E. coli
32% over limit
Discharged 166 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)