PATTERSON-KELLEY LLC
NPDES ID: PA0012394
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: 2 effluent violations.
Violations
April 30, 2026
3,4-Benzofluoranthene
4664% over limit
Discharged 0.000524 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
3018% over limit
Discharged 0.00053 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
3,4-Benzofluoranthene
6135% over limit
Discharged 0.00106 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
4655% over limit
Discharged 0.000523 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
3,4-Benzofluoranthene
1971% over limit
Discharged 0.000352 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
2455% over limit
Discharged 0.000281 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
3,4-Benzofluoranthene
3965% over limit
Discharged 0.000691 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
20% over limit
Discharged 0.034 mg/L against a permitted limit of 0.0283 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
3227% over limit
Discharged 0.000366 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
3,4-Benzofluoranthene
2473% over limit
Discharged 0.000283 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
2182% over limit
Discharged 0.000388 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
3,4-Benzofluoranthene
2209% over limit
Discharged 0.000254 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
1400% over limit
Discharged 0.000255 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
3,4-Benzofluoranthene
1382% over limit
Discharged 0.000252 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
2173% over limit
Discharged 0.00025 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
3,4-Benzofluoranthene
2218% over limit
Discharged 0.000255 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
1447% over limit
Discharged 0.000263 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
3,4-Benzofluoranthene
2227% over limit
Discharged 0.000256 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
1429% over limit
Discharged 0.00026 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
3,4-Benzofluoranthene
2209% over limit
Discharged 0.000254 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
1359% over limit
Discharged 0.000248 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrite + Nitrate total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (SEMI AVG)
DMR, Monitor Only - Overdue
3,4-Benzofluoranthene
1412% over limit
Discharged 0.000257 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrite + Nitrate total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrite + Nitrate total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (SEMI AVG)
DMR, Monitor Only - Overdue
Nitrite + Nitrate total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
Thallium, total [as Tl]
3% over limit
Discharged 0.0008 mg/L against a permitted limit of 0.00078 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
2200% over limit
Discharged 0.000253 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
3,4-Benzofluoranthene
2700% over limit
Discharged 0.000308 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
2700% over limit
Discharged 0.000476 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
3,4-Benzofluoranthene
2191% over limit
Discharged 0.000252 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
1400% over limit
Discharged 0.000255 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
3,4-Benzofluoranthene
2191% over limit
Discharged 0.000252 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
1412% over limit
Discharged 0.000257 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
Thallium, total [as Tl]
240% over limit
Discharged 0.0017 mg/L against a permitted limit of 0.0005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
1429% over limit
Discharged 0.00026 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
2182% over limit
Discharged 0.000251 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Thallium, total [as Tl]
592% over limit
Discharged 0.0054 mg/L against a permitted limit of 0.00078 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
3,4-Benzofluoranthene
1382% over limit
Discharged 0.000252 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
17% over limit
Discharged 0.033 mg/L against a permitted limit of 0.0283 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
2191% over limit
Discharged 0.000252 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
3,4-Benzofluoranthene
6371% over limit
Discharged 0.0011 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
3018% over limit
Discharged 0.000343 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
3,4-Benzofluoranthene
141076% over limit
Discharged 0.024 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
1264% over limit
Discharged 0.00015 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
3,4-Benzofluoranthene
809% over limit
Discharged 0.0001 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
488% over limit
Discharged 0.0001 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
3,4-Benzofluoranthene
800% over limit
Discharged 0.000099 mg/L against a permitted limit of 0.000011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
3,4-Benzofluoranthene
482% over limit
Discharged 0.000099 mg/L against a permitted limit of 0.000017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)