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   Party At-A-Glance Report

  
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General Information
Party ID Party Name Party Classification Mailing Address Work Phone Email/Website
598559 Northrop Grumman Systems Corporation Privately-Owned Business One Space Park Drive Cer Xe6d21 Redondo Beach, CA 90278 310-332-9348 James.Lesperance@ngc.com
  
  
  
  
Expand/Contract Related Places
Related Places
Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date
858816 Puente Valley Operable Unit Intermediate Zone Interim Remedy Los Angeles 4 Water Treatment Plant Owner 06/06/2019 None
Total Related Places: 1
  
  
  
  
Expand/Contract Related Parties
Related Parties
Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification
598581 Matthew Williams Person Legally Responsible Official 06/06/2019 None None
568963 James L'Esperance Person Employee 06/06/2019 None None
Total Related Parties: 2
  
  
  
  
Expand/Contract Regulatory Measures
Regulatory Measures (non-enforcement)
Reg. Measure ID Regulatory Measure Type Region WDID Status Program Order No. RM Effective Date RM Termination Date Relationship Relationship Start Date Relationship End Date Amended?
431175 Enrollee - NPDES 4 4B198903052 Active NPDNONMUNIPRCS R4-2023-0429 01/31/2020 None Discharger 02/06/2020 None N
Total Regulatory Measures: 1
  
  
  
  
Expand/Contract Violations
Violations within the past five years
Violation ID Occurrence Date Violation Type Violation Description(-) Violation Status Priority Source Facility Name Violated Reg. Meas. ID Violated Reg. Meas. Order No. Linked to Enf.
1141675 02/15/2025 Late Report Fourth Quarter 2024 report was submitted one day late. Violation N Report Puente Valley Operable Unit Intermediate Zone Interim Remedy 431175 R4-2023-0429 N
1141673 04/11/2024 CAT1 Sulfate, Total (as SO4) Maximum Daily (MDEL) limit is 300.0 mg/L and reported value was 390.0 mg/L. Violation N Report Puente Valley Operable Unit Intermediate Zone Interim Remedy 431175 R4-2023-0429 N
1141653 04/11/2024 CAT1 Chloride Maximum Daily (MDEL) limit is 180.0 mg/L and reported value was 190.0 mg/L. Violation N Report Puente Valley Operable Unit Intermediate Zone Interim Remedy 431175 R4-2023-0429 N
1141652 05/31/2024 Deficient Monitoring Temperature, pH, TSS, Turbidity, BOD, Oil and Grease, Settleable Solids, Sulfides, Phenols, Residual Chlorine, MBAS, Total Dissolved Solids, Sulfate, Chloride, Boron, Nitrogen, Selenium, 1,1-Dichloroethylene, Methyl tertiary butyl ether, Tetrachloroethylene, Trichloroethylene, Vinyl Chloride, Benzo(a)pyrene, Bis(2-Ethylhexyl) phthalate, N-nitrosodimethylamine, 1,4-Dioxane, and Perchlorate not sampled in May, required monthly. Violation N Report Puente Valley Operable Unit Intermediate Zone Interim Remedy 431175 R4-2023-0429 N
1141651 08/15/2024 Late Report Second Quarter 2024 report was submitted one day late. Violation N Report Puente Valley Operable Unit Intermediate Zone Interim Remedy 431175 R4-2023-0429 N
1126718 02/15/2024 Late Report Fourth Quarter 2023 report was submitted one day late. Violation N Report Puente Valley Operable Unit Intermediate Zone Interim Remedy 431175 R4-2023-0429 N
1126704 05/31/2023 Deficient Monitoring 1,4-Dioxane not analyzed for the month of May, required monthly. Violation N Report Puente Valley Operable Unit Intermediate Zone Interim Remedy 431175 R4-2023-0429 N
1115283 09/24/2021 CAT2 Dioxane Daily Maximum limit is 3 ug/L and reported value was 3.7 ug/L. Violation N Report Puente Valley Operable Unit Intermediate Zone Interim Remedy 431175 R4-2023-0429 Y
Report currently showing last five years of violations. Click here to return to viewing one year of violations. Refer to the Interactive Violation Report for more data.
Total Violations: 8
*Click the "(+/-) Violation Description" link to expand and contract the violation description.
  
  
  
  
Expand/Contract Enforcement Actions
Enforcement Actions
Enforcement ID Enforcement Type Enf. Order No. Title Program Effective Date Status
452805 Admin Civil Liability R4-2023-0155 ACL R4-2023-0155 for Northrop Grumman Systems Corporation NPDNONMUNIPRCS 08/23/2023 Historical
Total Enforcement Actions: 1
  
  
  
  
Expand/Contract Enforcement Actions
Regulatory Measures linked to Related Parties
Reg. Measure ID Organization Regulatory Measure Type Program Effective Date Status
431175 James L'Esperance Enrollee - NPDES NPDNONMUNIPRCS 01/31/2020 Active
Total Regulatory Measures linked to Related Parties: 1
  
  
The current report was generated with data as of: 10/31/2025
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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