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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
48117 US Borax Inc Privately-Owned Business 14486 Borax Road Boron, CA 93516 760-762-7222(+) richard.cohen@riotinto.com
  
  
  
  
Expand/Contract Related Places
Related Places
Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date
857400 Lang Mine Los Angeles 4 Salt Mining Owner and Operator 04/02/2019 None
246358 Owens Lake Trona Processing Inyo 6B Salt Mining Owner 01/22/2003 None
226707 Gangue/Overburden/Ref Waste Kern 6B Salt Mining Owner 11/28/1994 None
210080 Boron Mine Facility Kern 6B Salt Mining Owner 06/24/1976 None
Total Related Places: 4
  
  
  
  
Expand/Contract Related Parties
Related Parties
Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification
605985 Richard Cohen Person Legally Responsible Official 01/21/2020 None None
596367 Nathan Francis Person Legally Responsible Official 04/02/2019 01/21/2020 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?
376452 WDR 6V 6B152004002 Active LNDISPOTH R6V-2010-0048 10/14/2010 None Discharger 04/13/1989 None N
132919 WDR 6V 6B140202001 Active LNDISPOTH 04-035 09/09/2004 None Discharger 09/09/2004 None N
403003 WDR 6V 6B152004001 Active LNDISPOTH R6V-2015-0057 09/17/2015 None Discharger 09/17/2015 None Y
306715 WDR 6V 6B152004001 Historical LNDISPOTH R6V-2006-0025 06/14/2006 09/17/2015 Discharger 04/11/2001 None Y
147168 WDR 6V 6B152004001 Historical LNDISP 90-037 05/10/1990 None Discharger 05/10/1990 None N
146443 WDR 6V 6B152004002 Historical LNDISP 89-059 04/13/1989 10/14/2010 Discharger 04/13/1989 None Y
147882 WDR 6V 6B152004001 Historical LNDISP 78-075 12/07/1978 None Discharger 12/07/1978 None N
146150 WDR 6V 6B152004001 Historical LNDISP 93-017 03/11/1993 04/10/2001 Discharger 03/11/1993 None Y
147899 WDR 6V 6B152004001 Historical LNDISP 80-025 03/13/1980 None Discharger 03/13/1980 None N
147194 WDR 6V 6B152004001 Historical LNDISP 84-014 01/12/1984 None Discharger 01/12/1984 None N
148008 WDR 6V 6B152004001 Historical LNDISP 01-019 04/11/2001 04/11/2006 Discharger 04/11/2001 None N
147859 WDR 6V 6B152004001 Historical LNDISP 76-070 06/24/1976 None Discharger 06/24/1976 None N
146444 WDR 6V 6B152004001 Historical LNDISP 89-078 04/13/1989 None Discharger 04/13/1989 None N
429730 13267 Letter (Non-Enforcement) 4 None Historical LFNONOPER R4-2019-0012 03/29/2019 07/21/2020 Discharger 04/02/2019 None N
Total Regulatory Measures: 14
  
  
  
  
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.
1115537 12/31/2021 Deficient Monitoring (1) Wastewater average daily flow, volume of flow, and cumulative flow to each s Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1140128 12/31/2023 Order Conditions (1) Failure to maintain groundwater well 3M-71 during the 2nd half 2023 monitori Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1115553 12/31/2022 Deficient Monitoring (1) Wastewater average daily flow, volume of flow, and cumulative flow to each s Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1147620 12/31/2021 Order Conditions Wells GWM-37, GWM-78, GWM-81, GWM-82, GWM-105, GWM-106, GWM-111, GWM-113 were dr Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1147621 06/30/2022 Order Conditions Wells GWM-37, GWM-78, GWM-81, GWM-82, GWM-105, GWM-106, GWM-111, GWM-113 were dr Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1147626 12/31/2023 Order Conditions Wells GWM-37, GWM-78, GWM-81, GWM-82, GWM-105, GWM-106, GWM-111, GWM-113 were dr Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1147628 12/31/2024 Order Conditions Wells GWM-37, GWM-78, GWM-81, GWM-82, GWM-105, GWM-106, GWM-111, GWM-113 were dr Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115530 06/30/2021 Order Conditions (1) Failure to maintain the following groundwater monitoring or extraction wells Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115541 09/21/2021 Deficient Monitoring Unsaturated zone moisture exceeded upper tolerance limits. Field verification te Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1102498 12/31/2021 Deficient Monitoring Failure to conduct the required sampling for the Five-Year COC Program during th Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115552 08/04/2022 Groundwater Exceeded the CUSUM limit of Antimony, Bicarbonate Alkalinity as CACO3, Boron, Ca Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1147627 06/30/2024 Order Conditions Wells GWM-37, GWM-78, GWM-81, GWM-82, GWM-105, GWM-106, GWM-111, GWM-113 were dr Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115535 12/31/2021 Order Conditions (1) Failure to maintain the following groundwater monitoring or extraction wells Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115547 01/31/2022 Order Conditions Surface impoundment action leakage rates exceeded. Violates Board Order R6V-2015 Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1147460 06/30/2025 Order Conditions Wells GWM-37, GWM-78, GWM-81, GWM-82, GWM-105, GWM-106, GWM-111, GWM-113 were dr Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1147622 12/31/2022 Order Conditions Wells GWM-37, GWM-78, GWM-81, GWM-82, GWM-105, GWM-106, GWM-111, GWM-113 were dr Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115532 06/30/2021 Deficient Monitoring (1) Wastewater average daily flow, volume of flow, and cumulative flow to each s Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115536 11/18/2021 Groundwater (1) Exceeded the CUSUM limit of Chloride, Mercury, and Sulfate during the 2021 2 Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115538 12/31/2021 Deficient Monitoring (1) Wastewater sample was not analyzed for annual constituents of concern in Att Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115544 06/30/2022 Order Conditions (1) Failure to maintain the following groundwater monitoring or extraction wells Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115554 12/31/2022 Deficient Monitoring (1) Wastewater sample was not analyzed for annual constituents of concern in Att Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115556 09/13/2022 Deficient Monitoring Unsaturated zone moisture exceeded upper tolerance limits. Field verification te Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1141541 01/26/2025 Order Conditions 1. Board Order No. R6V-2015-0057, Section IV. B., Standard Provisions, The Disch Violation N Inspection Boron Mine Facility 403003 R6V-2015-0057 Y
1147625 06/30/2023 Order Conditions Wells GWM-37, GWM-78, GWM-81, GWM-82, GWM-105, GWM-106, GWM-111, GWM-113 were dr Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1102499 12/31/2021 Deficient Reporting Failure to report the results of the 2021 Five-Year COC Program to the Water Boa Violation None Report Boron Mine Facility 403003 R6V-2015-0057 Y
1104478 05/19/2022 Order Conditions Failure to maintain total arsenic concentrations below 500 parts per million (pp Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115539 07/31/2021 Order Conditions Surface impoundment action leakage rates exceeded. Violates Board Order R6V-2015 Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115545 04/12/2022 Groundwater (1) Exceeded the CUSUM limit of Fluoride during the 2022 1st Half monitoring per Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115546 06/30/2022 Deficient Monitoring (1) Wastewater sample was not analyzed for annual constituents of concern in Att Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115548 03/15/2022 Deficient Monitoring Unsaturated zone moisture exceeded upper tolerance limits. Field verification te Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1115550 12/31/2022 Order Conditions (1) Failure to maintain well 3M-71 in good working order. Violates Board Order R Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1141542 01/26/2025 Order Conditions MRP, Section II.A.4.a.ii states ¿Upon detection of leachate in a previously dry Violation N Inspection Boron Mine Facility 403003 R6V-2015-0057 Y
1115555 07/31/2022 Order Conditions Surface impoundment action leakage rates exceeded. Violates Board Order R6V-2015 Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1141543 01/26/2025 Order Conditions Board Order No. R6V-2015-0057, Section IV. B., Standard Provisions, The Discharg Violation N Inspection Boron Mine Facility 403003 R6V-2015-0057 Y
1147456 12/31/2024 Deficient Reporting (1) LCRS Average Daily Flow rates are not reported in the 2024 2nd half monitori Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1147459 06/30/2025 Deficient Reporting (1) LCRS Average Daily Flow rates are not reported in the 2025 1st half monitori Violation N Report Boron Mine Facility 403003 R6V-2015-0057 Y
1140135 03/27/2023 Groundwater Exceeded the CUSUM limit of Antimony, Carbonate Alkalinity as CACO3, Chloroform, Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1140129 08/03/2023 Groundwater Exceeded the CUSUM limit of Arsenic and Chloroform during the 2nd half 2023 moni Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1147455 07/01/2024 Deficient Monitoring (1) Surface impoundment action leakage rates exceeded. Violates Board Order R6V- Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1147457 05/21/2025 Groundwater Exceeded the control limit of Antimony, Bicarbonate Alkalinity (as CaCO3), Calci Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1140137 06/30/2024 Order Conditions (1) Failure to maintain groundwater well 3M-71 during the 1st half 2024 monitori Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1140132 09/20/2023 Deficient Monitoring (1) Unsaturated zone soil moisture exceeded upper tolerance limits. Violates Boa Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1140133 01/31/2023 Deficient Monitoring (1) List of all monitoring pairs that have exhibited a verified measurably signi Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1140136 03/06/2023 Deficient Monitoring Unsaturated zone soil moisture exceeded upper tolerance limits. Violates Board O Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1140138 02/28/2024 Deficient Monitoring (1) Unsaturated zone soil moisture exceeded upper tolerance limits. Violates Boa Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1140134 06/30/2023 Order Conditions (1) Failure to maintain groundwater well 3M-71 during the 1st half 2023 monitori Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1147458 01/01/2025 Deficient Monitoring (1) Surface impoundment action leakage rates exceeded. Violates Board Order R6V- Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1140139 04/09/2024 Groundwater Exceeded the CUSUM limit of Boron, Carbonate Alkalinity as CACO3, Chloroform, an Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1147454 09/18/2024 Groundwater (1) Exceeded the statistical control limit of Chloride, Dissolved Calcium, Disso Violation N Report Boron Mine Facility 403003 R6V-2015-0057 N
1147619 06/30/2021 Order Conditions Wells GWM-37, GWM-78, GWM-81, GWM-82, GWM-105, GWM-106, GWM-111, GWM-113 were dr Violation N Report Boron Mine Facility 403003 R6V-2015-0057 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: 50
*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
462602 Staff Enforcement Letter None Comments on the 2025 Semi-Annual Report; Detection Monitoring Surface Impoundments, Board Order R6V- 2015-0057, U.S. Borax Mine, U.S. Borax Inc., Rio Tinto LNDISPOTH 09/09/2025 Historical
462600 Staff Enforcement Letter None Board Order R6V- 2015-0057, Detection Monitoring Program, U.S. Borax Mine, U.S. Borax Inc., Rio Tinto, Kern County LNDISPOTH 09/08/2025 Historical
460528 Notice of Violation None NOV 03/24/2025 for US Borax Inc LNDISPOTH 03/24/2025 Active
455401 13267 Letter None 13267 Letter 12/04/2023 for US Borax Inc LNDISPOTH 12/04/2023 Active
452351 Oral Communication None Oral Com 04/20/2023 for US Borax Inc LNDISPOTH 04/20/2023 Active
449819 Oral Communication None Oral Com 11/08/2022 for US Borax Inc LNDISPOTH 05/25/2022 Historical
449592 Notice of Violation None NOV 03/30/2022 for US Borax Inc LNDISPOTH 03/30/2022 Historical
441506 Notice of Violation None NOV 12/03/2020 for US Borax Inc LNDISPOTH 12/03/2020 Active
441069 Notice of Violation None NOV 09/11/2017 for US Borax Inc LNDISPOTH 09/11/2017 Historical
441057 Notice of Violation None NOV 10/20/2020 for US Borax Inc LNDISPOTH 10/20/2020 Historical
397542 Oral Communication None Oral Com 12/11/2013 for EIF Mojave, LLC LNDISP 12/11/2013 Historical
395155 Oral Communication None Oral Com 12/11/2013 for EIF Mojave, LLC LNDISP 12/11/2013 Historical
394166 Staff Enforcement Letter None SEL 11/26/2013 for US Borax Inc LNDISP 11/26/2013 Historical
377136 Notice of Violation R6V-2006-0025 NOV - RIO TINTO MINERALS (12/24/2010) LNDISP 12/24/2010 Active
371430 Notice of Violation R6V-2006-0025 NOV - RIO TINTO MINERALS (09/14/2009) LNDISP 09/14/2009 Active
356611 Notice of Violation R6V-2006-0025 Notice of Violation for US Borax Inc LNDISP 04/14/2008 Historical
252162 Staff Enforcement Letter UNKNOWN Enforcement - 6B152004001 LNDISP 08/02/2004 Historical
248961 Oral Communication UNKNOWN Enforcement - 6B152004002 LNDISP 07/01/2002 Historical
248691 Oral Communication UNKNOWN Enforcement - 6B152004001 TPCA 08/27/2002 Historical
245548 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 11/04/2002 Historical
244391 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 11/08/2000 Historical
244388 Notice of Violation UNKNOWN Enforcement - 6B152004001 LNDISP 10/13/2000 Historical
244384 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 09/28/2000 Historical
244341 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 09/24/2000 Historical
244126 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 06/22/2000 Historical
244032 Notice to Comply UNKNOWN Enforcement - 6B152004001 LNDISP 06/06/2000 Historical
243824 Oral Communication UNKNOWN Enforcement - 6B152004002 LNDISP 04/20/2000 Historical
243819 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 03/20/2000 Historical
243775 Notice of Violation UNKNOWN Enforcement - 6B152004001 LNDISP 03/06/2000 Historical
241177 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 03/18/2002 Historical
238820 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 12/27/2001 Historical
238716 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 10/22/2001 Historical
235356 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 07/10/2001 Historical
234683 Oral Communication UNKNOWN Enforcement - 6B152004001 LNDISP 03/28/2001 Historical
223144 Admin Civil Liability R6V-1998-0022 Enforcement - 6B152004001 LNDISP 04/16/1998 Historical
219702 Clean-up and Abatement Order 85-016 Enforcement - 6B152004001 LNDISP 12/31/1985 Historical
219576 Clean-up and Abatement Order 90-03701 Enforcement - 6B152004001 LNDISP 05/10/1990 Historical
Total Enforcement Actions: 37
  
  
  
  
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: 06/19/2026
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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