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California Integrated Water Quality System Project (CIWQS)
   Party At-A-Glance Report

  
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General Information
Party ID Party Name Party Classification Mailing Address Work Phone Email/Website
605017 John Espinoza 67750 Bailey Road Hc1 Box 224 Mountain Pass, CA 92366 None jespinoza@mpmaterials.com
  
  
  
  
Expand/Contract Related Places
Related Places
Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date
246044 Onsite Evaporation Ponds San Bernardino 6B Surface Impoundment Contact 07/12/2017 None
244589 North Tailing Pond P-16 San Bernardino 6B Metal Mining Contact 07/12/2017 None
241611 Mountain Pass P-1 Closure San Bernardino 6B Metal Mining Contact 07/12/2017 None
241610 Mountain Pass Mine & Mill Ops San Bernardino 6B Metal Mining Contact 07/12/2017 None
220454 DOMESTIC WASTEWATER T&DFs San Bernardino 6B Wastewater Treatment Facility Contact 07/12/2017 None
215314 COMMUNITY & CO LANDFILLS-Molycorp San Bernardino 6B Land fill None None None
Total Related Places: 6
  
  
  
  
Expand/Contract Related Parties
Related Parties
Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification
487446 MP Mine Operations LLC Organization Employee 07/12/2017 None Privately-Owned Business
Total Related Parties: 1
  
  
  
  
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?
388260 WDR 6V 6B360011004 Active WDRMUNIENROTH WQ 2014-0153-DWQ 11/07/2012 None Discharger Contact 07/12/2017 11/15/2021 N
377626 WDR 6V 6B362098001 Active LNDISPOTH R6V-2010-0047 10/14/2010 None Discharger Contact 07/12/2017 None N
306717 WDR 6V 6B369706002 Active LFNONOPER R6V-2006-0024 06/14/2006 None Discharger Contact 07/12/2017 None N
148001 WDR 6V 6B360008001 Active LNDISPOTH 00-074 09/14/2000 None Discharger Contact 07/12/2017 None N
133369 WDR 6V 6B369807003 Active LNDISPOTH R6V-2005-0011 04/14/2005 None Discharger Contact 07/12/2017 None N
132920 WDR 6V 6B360009001 Active LNDISPOTH R6V-2004-0042 10/14/2004 None Discharger Contact 07/12/2017 None N
Total Regulatory Measures: 6
  
  
  
  
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.
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: 0
*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
Total Enforcement Actions: 0
  
  
  
  
Expand/Contract Enforcement Actions
Regulatory Measures linked to Related Parties
Reg. Measure ID Organization Regulatory Measure Type Program Effective Date Status
454473 MP Mine Operations LLC Enrollee - WDR CERFILLEXC 03/18/2024 Active
388260 MP Mine Operations LLC WDR WDRMUNIENROTH 11/07/2012 Active
377626 MP Mine Operations LLC WDR LNDISPOTH 10/14/2010 Active
376674 MP Mine Operations LLC Enrollee - 401 Certification CERFILLEXC 12/02/2010 Historical
306717 MP Mine Operations LLC WDR LFNONOPER 06/14/2006 Active
148025 MP Mine Operations LLC WDR WDRMUNIOWTS 04/11/2001 Historical
148001 MP Mine Operations LLC WDR LNDISPOTH 09/14/2000 Active
145895 MP Mine Operations LLC WDR LNDISP 06/13/1991 Historical
133369 MP Mine Operations LLC WDR LNDISPOTH 04/14/2005 Active
132920 MP Mine Operations LLC WDR LNDISPOTH 10/14/2004 Active
Total Regulatory Measures linked to Related Parties: 10
  
  
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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