MASON TOWN OF
NPDES ID: WV0021849
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: 21 effluent violations.
Violations
May 31, 2026
Solids, total suspended
513% over limit
Discharged 184 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
150% over limit
Discharged 70.8239994 kg/d against a permitted limit of 28.37499976 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
86% over limit
Discharged 55.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
25% over limit
Discharged 70.8239994 kg/d against a permitted limit of 56.74999952 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
567% over limit
Discharged 0 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
8% over limit
Discharged 16.2 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
44% over limit
Discharged 0.0316 mg/L against a permitted limit of 0.022 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
193% over limit
Discharged 56 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Coliform, fecal general
1400% over limit
Discharged 6000 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
2900% over limit
Discharged 6000 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
122% over limit
Discharged 63.10599947 kg/d against a permitted limit of 28.37499976 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
11% over limit
Discharged 63.10599947 kg/d against a permitted limit of 56.74999952 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
207% over limit
Discharged 184 mg/L against a permitted limit of 60 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
139% over limit
Discharged 35.9 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
10% over limit
Discharged 220 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
20% over limit
Discharged 35.9 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
41% over limit
Discharged 21.2 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
2750% over limit
Discharged 5700 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Coliform, fecal general
1325% over limit
Discharged 5700 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Coliform, fecal general
85% over limit
Discharged 370 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
December 31, 2025
Coliform, fecal general
285% over limit
Discharged 1539 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
670% over limit
Discharged 1539 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
October 31, 2025
Coliform, fecal general
40% over limit
Discharged 280 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
July 31, 2025
Solids, total suspended
202% over limit
Discharged 85.57899928 kg/d against a permitted limit of 28.37499976 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
1600% over limit
Discharged 3400 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
190% over limit
Discharged 87 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
51% over limit
Discharged 85.57899928 kg/d against a permitted limit of 56.74999952 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
27% over limit
Discharged 0.157 mg/L against a permitted limit of 0.124 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
150% over limit
Discharged 0.055 mg/L against a permitted limit of 0.022 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
750% over limit
Discharged 3400 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
20% over limit
Discharged 72 mg/L against a permitted limit of 60 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
260% over limit
Discharged 102.14999914 kg/d against a permitted limit of 28.37499976 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
80% over limit
Discharged 102.14999914 kg/d against a permitted limit of 56.74999952 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
140% over limit
Discharged 72 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
45% over limit
Discharged 87 mg/L against a permitted limit of 60 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
34% over limit
Discharged 0.055 mg/L against a permitted limit of 0.041 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
453% over limit
Discharged 17 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
April 30, 2025
Coliform, fecal general
375% over limit
Discharged 1900 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
850% over limit
Discharged 1900 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
March 31, 2025
Coliform, fecal general
4600% over limit
Discharged 9400 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
85% over limit
Discharged 27.7 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
33% over limit
Discharged 40 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
2250% over limit
Discharged 9400 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
15% over limit
Discharged 34.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Coliform, fecal general
4600% over limit
Discharged 9400 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
10% over limit
Discharged 33 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
15% over limit
Discharged 34.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
2250% over limit
Discharged 9400 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
33% over limit
Discharged 40 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
120% over limit
Discharged 33 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
132% over limit
Discharged 34.8 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
600% over limit
Discharged 2800 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
1300% over limit
Discharged 2800 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
16% over limit
Discharged 34.8 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2024
Copper, total recoverable
91% over limit
Discharged 0.042 mg/L against a permitted limit of 0.022 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
2% over limit
Discharged 0.042 mg/L against a permitted limit of 0.041 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)