CORESLAB STRUCTURES (OMAHA), INC
NPDES ID: NE0124052
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
This quarter: 1 single-event violation.
Violations
March 31, 2026
Manganese, total [as Mn]
14% over limit
Discharged 2.8 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
29% over limit
Discharged 16.57 mg/L against a permitted limit of 12.85 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
24% over limit
Discharged 15.88 mg/L against a permitted limit of 12.85 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved [TDS]
4% over limit
Discharged 642 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
36% over limit
Discharged 17.53 mg/L against a permitted limit of 12.85 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
6% over limit
Discharged 2.59 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Iron, total [as Fe]
36% over limit
Discharged 17.53 mg/L against a permitted limit of 12.85 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 8.5 SU (DAILY MX)
DMR, Limited - Overdue
Manganese, total [as Mn]
9% over limit
Discharged 2.67 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
192% over limit
Discharged 37.51 mg/L against a permitted limit of 12.85 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
18% over limit
Discharged 15.2 mg/L against a permitted limit of 12.85 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
4% over limit
Discharged 2.56 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
6% over limit
Discharged 2.59 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 0 SU against a permitted limit of 8.5 SU (DAILY MX)
DMR, Limited - Overdue
September 30, 2025
Solids, total 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 [TDS]
0% over limit
Discharged 0 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Overdue
Manganese, total [as Mn]
6% over limit
Discharged 2.6 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MN)
DMR, Monitor Only - Overdue
Solids, total dissolved [TDS]
0% over limit
Discharged 0 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total dissolved [TDS]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Iron, total [as Fe]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MN)
DMR, Monitor Only - Overdue
Iron, total [as Fe]
0% over limit
Discharged 0 mg/L against a permitted limit of 12.85 mg/L (DAILY MX)
DMR, Limited - Overdue
Manganese, total [as Mn]
0% over limit
Discharged 0 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total dissolved [TDS]
21% over limit
Discharged 744 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 0 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
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
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Manganese, total [as Mn]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Iron, total [as Fe]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Iron, total [as Fe]
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 8.5 SU (DAILY MX)
DMR, Limited - Overdue
Manganese, total [as Mn]
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 8.5 SU (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 8.5 SU (DAILY MX)
DMR, Limited - Overdue
Solids, total dissolved [TDS]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Temperature, water deg. fahrenheit
0% over limit
Discharged 0 deg F against a permitted limit of 90 deg F (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 8.5 SU (DAILY MX)
DMR, Limited - Overdue
Temperature, water deg. fahrenheit
0% over limit
Discharged 0 deg F against a permitted limit of 0 deg F (MO AVG)
DMR, Monitor Only - Overdue
Solids, total dissolved [TDS]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MN)
DMR, Monitor Only - Overdue
Chloride [as Cl]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MN)
DMR, Monitor Only - Overdue
Solids, total dissolved [TDS]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
June 30, 2025
Solids, total dissolved [TDS]
4% over limit
Discharged 644 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
3% over limit
Discharged 2.52 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 0 SU against a permitted limit of 8.5 SU (DAILY MX)
DMR, Limited - Overdue
Solids, total dissolved [TDS]
31% over limit
Discharged 810 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Manganese, total [as Mn]
20% over limit
Discharged 2.94 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Manganese, total [as Mn]
18% over limit
Discharged 2.9 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved [TDS]
18% over limit
Discharged 726 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
11% over limit
Discharged 14.2 mg/L against a permitted limit of 12.85 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved [TDS]
3% over limit
Discharged 638 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
14% over limit
Discharged 2.8 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, total dissolved [TDS]
13725% over limit
Discharged 85300 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
10% over limit
Discharged 2.69 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved [TDS]
9% over limit
Discharged 673 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Manganese, total [as Mn]
35% over limit
Discharged 3.3 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
11% over limit
Discharged 14.31 mg/L against a permitted limit of 12.85 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved [TDS]
3% over limit
Discharged 638 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved [TDS]
1% over limit
Discharged 626 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
111% over limit
Discharged 5.16 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved [TDS]
1% over limit
Discharged 624 mg/L against a permitted limit of 617 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
21% over limit
Discharged 2.97 mg/L against a permitted limit of 2.45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)