ARTHUR R. WILSON QUARRY
NPDES ID: CA0005274
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
January 31, 2026
Solids, total dissolved
130% over limit
Discharged 2300 mg/L against a permitted limit of 1000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Molybdenum, total [as Mo]
10% over limit
Discharged 0.011 mg/L against a permitted limit of 0.01 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
6% over limit
Discharged 0.01275 mg/L against a permitted limit of 0.012 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total dissolved
120% over limit
Discharged 2200 mg/L against a permitted limit of 1000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Di[2-ethylhexyl] phthalate [DEHP]
89% over limit
Discharged 0.0034 mg/L against a permitted limit of 0.0018 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Molybdenum, total [as Mo]
50% over limit
Discharged 0.015 mg/L against a permitted limit of 0.01 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Copper, total recoverable
29% over limit
Discharged 0.031 mg/L against a permitted limit of 0.024 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved
470% over limit
Discharged 5700 mg/L against a permitted limit of 1000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Sediment, suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Sediment, suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Molybdenum, total [as Mo]
30% over limit
Discharged 0.013 mg/L against a permitted limit of 0.01 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
158% over limit
Discharged 0.031 mg/L against a permitted limit of 0.012 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total recoverable
90% over limit
Discharged 1.90000009 mg/L against a permitted limit of 1.00000005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total recoverable
60% over limit
Discharged 1.60000008 mg/L against a permitted limit of 1.00000005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Sediment, suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Sediment, suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total dissolved
100% over limit
Discharged 2000 mg/L against a permitted limit of 1000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Molybdenum, total [as Mo]
20% over limit
Discharged 0.012 mg/L against a permitted limit of 0.01 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Sediment, suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total dissolved
85% over limit
Discharged 1850 mg/L against a permitted limit of 1000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Sediment, suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Molybdenum, total [as Mo]
20% over limit
Discharged 0.012 mg/L against a permitted limit of 0.01 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Diazinon
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Di[2-ethylhexyl] phthalate [DEHP]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0018 mg/L (MO AVG)
DMR, Limited - Overdue
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
Turbidity
0% over limit
Discharged 0 NTU against a permitted limit of 50 NTU (DAILY MX)
DMR, Limited - Overdue
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
Sulfate, total [as SO4]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Copper, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.024 mg/L (DAILY MX)
DMR, Limited - Overdue
Mercury, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.00005 mg/L (MO AVG)
DMR, Limited - Overdue
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
Mercury, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0001 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 1000 mg/L (MO AVG)
DMR, Limited - Overdue
Iron, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 1.00000005 mg/L (MO AVG)
DMR, Limited - Overdue
Aluminum, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 5.00000024 mg/L (DAILY MX)
DMR, Limited - Overdue
Di[2-ethylhexyl] phthalate [DEHP]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0036 mg/L (DAILY MX)
DMR, Limited - Overdue
Chloride [as Cl]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Aluminum, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 1.00000005 mg/L (MO AVG)
DMR, Limited - Overdue
Sediment, suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
%Effect Static Renewal 7Day Chronic Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO MED)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 50 mg/L (MO AVG)
DMR, Limited - Overdue
Cyanide, total [as CN]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0043 mg/L (MO AVG)
DMR, Limited - Overdue
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO MED)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 7 SU (MINIMUM)
DMR, Limited - Overdue
Oil and grease
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Temperature, water deg. fahrenheit
0% over limit
Discharged 0 deg F against a permitted limit of 0 deg F (INST MIN)
DMR, Monitor Only - Overdue
%Effect Static 4 Day Chronic Raphidocelis subcapitata
0% over limit
Discharged 0 % against a permitted limit of 0 % (MO MED)
DMR, Monitor Only - Overdue
Molybdenum, total [as Mo]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.01 mg/L (MO AVG)
DMR, Limited - Overdue
Cyanide, total [as CN]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0085 mg/L (DAILY MX)
DMR, Limited - Overdue
Chlorpyrifos
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
Copper, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.012 mg/L (MO AVG)
DMR, Limited - Overdue
Pass/Fail Static 4 Day Chronic Raphidocelis subcapitata
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (DAILY MX)
DMR, Monitor Only - Overdue
Coliform, fecal general
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 0 MPN/100mL (DAILY MX)
DMR, Monitor Only - Overdue
Nickel, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Pass/Fail Static 4 Day Chronic Raphidocelis subcapitata
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (MO MED)
DMR, Monitor Only - Overdue
Sodium, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 8.3 SU (MAXIMUM)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Boron, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Sediment, suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)