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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
13909 Diamond Bar City City Agency 21810 Copley Drive Diamond Bar, CA 91765-4178 909-839-7044(+) None
  
  
  
  
Expand/Contract Related Places
Related Places
Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date
808438 Los Angeles County MS4s Los Angeles 4 MS4 None None None
631955 Diamond Bar City CS Los Angeles 4 Collection_System Owner 04/06/2006 None
243618 Diamond Bar City - Mun Separate Storm Sewer, MS4 Los Angeles 4 MS4 Owner 12/13/2001 None
Total Related Places: 3
  
  
  
  
Expand/Contract Related Parties
Related Parties
Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification
361559 May Hong Person Data Submitter 01/25/2007 None None
537094 Alexander Villarama Person Legally Responsible Official 07/23/2013 None None
647253 Samantha Hubley Person Data Submitter 09/23/2024 None None
100794 David Liu Person Legally Responsible Official 03/20/2002 None None
650303 Hassan Majidi Person Data Submitter 04/10/2025 None None
649039 Nicholas Delgado Person Data Submitter 02/02/2025 None None
334830 Jeffrey Bouse Person Legally Responsible Official 07/16/2012 None None
650353 Marie Garcia Person Data Submitter 04/10/2025 None None
646750 Tiara Caruthers Person Data Submitter 08/15/2024 None None
643241 Andrew Ngumba Person Legally Responsible Official 03/12/2024 None None
363584 Joyce Lee Person Data Submitter 02/06/2007 None None
639886 Brigette Padilla Person Data Submitter 06/06/2023 10/02/2024 None
362164 Nicholas Agbobu Person Legally Responsible Official 01/26/2007 09/22/2022 None
550148 Daniel Lafferty Person Legally Responsible Official 02/20/2015 11/16/2015 None
535586 Rajesh Patel Person Legally Responsible Official 07/26/2012 07/31/2014 None
377387 Robert Swartz Person Legally Responsible Official 08/03/2007 10/31/2012 None
334830 Jeffrey Bouse Person Legally Responsible Official 01/25/2007 10/18/2012 None
460817 Gohar Tsolakyan Person Data Submitter 03/11/2008 09/24/2012 None
361237 Keith Lehto Person Legally Responsible Official 01/24/2007 07/17/2012 None
524466 Erica Gonzales Person Data Submitter 09/02/2010 07/12/2012 None
362130 Norman Cortez Diamond Bar Person Data Submitter 01/26/2007 09/02/2010 None
362371 Cynthia Marquez Diamond Bar Person Data Submitter 01/29/2007 09/02/2010 None
Total Related Parties: 22
  
  
  
  
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?
301157 Enrollee 4 4SSO10382 Active SSOMUNILRG 2022-0103-DWQ 11/21/2006 None Discharger 04/17/2006 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.
1113559 08/14/2021 Sanitary Sewer Overflow/Spill/ On August 14, 2021 the backup emergency generator failed at the Fountain Springs Violation N SSO Diamond Bar City CS 301157 2022-0103-DWQ Y
1113561 12/07/2021 Sanitary Sewer Overflow/Spill/ On December 7, 2021, a control system failure occurred at the Fountain Springs P Violation N SSO Diamond Bar City CS 301157 2022-0103-DWQ Y
1135472 10/28/2024 Sanitary Sewer Overflow/Spill/ Type: Category 1 Spill; Pipe Structural Problem/Failure - Controls caused 1900 g Violation None SSO Diamond Bar City CS 301157 2022-0103-DWQ N
1133402 01/23/2024 Sanitary Sewer Overflow/Spill/ Type: Category 1 Spill; Root Intrusion caused 300 gallons of sewage to spill fro Violation None SSO Diamond Bar City CS 301157 2022-0103-DWQ N
1146779 08/23/2025 Sanitary Sewer Overflow/Spill/ Type: Category 1 Spill; Fats, Oil and Grease (FOG) caused 100 gallons of sewage Violation None SSO Diamond Bar City CS 301157 2022-0103-DWQ N
1133401 01/21/2024 Sanitary Sewer Overflow/Spill/ Type: Category 1 Spill; Root Intrusion caused 7000 gallons of sewage to spill fr Violation None SSO Diamond Bar City CS 301157 2022-0103-DWQ N
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: 6
*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
451303 Notice of Violation None NOV 12/07/2021 for Diamond Bar City SSOMUNILRG 12/07/2021 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
Total Regulatory Measures linked to Related Parties: 0
  
  
The current report was generated with data as of: 11/07/2025
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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