Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Emergency Response
    • Environmental Information by Location
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History

Breadcrumb

  1. Home
  2. EPA in Arizona
  3. Topics and Resources
  4. Desotec US LLC (Evoqua)

Desotec US LLC (Formerly Evoqua Water Technologies LLC): Facility Inspection Reports and Enforcement Actions

Enforcement action and facility inspection reports for the Desotec US LLC (Formerly Evoqua Water Technologies LLC) carbon regeneration facility located on the Colorado River Indian Tribes (CRIT) reservation near Parker, Arizona.

Free viewers and readers are available to access documents on our website. If you encounter issues with assistive technology, please contact us.

  • CEI Report: Evoqua Water Technologies (pdf) (569.46 KB, August 15, 2021)
    Compliance Evaluation Inspection Report (CEI) for Evoqua Water Technologies. EPA ID No: AZD982441263.
  • CEI Report: Evoqua Water Technologies, LLC (pdf) (744.26 KB, April 5, 2018)
    Compliance Evaluation Inspection (CEI) Report for Evoqua Water Technologies, LLC. EPA ID No: AZD982441263.
  • CEI Report: Evoqua Water Technologies, LLC (pdf) (309.01 KB, April 20, 2015)
    Compliance Evaluation Inspection (CEI) Report for Evoqua Water Technologies, LLC. EPA ID No: AZD982441263.
  • CEI Report: Siemens Industries Inc. LLC (pdf) (1.43 MB, April 2, 2012)
    Compliance Evaluation Inspection (CEI) for Siemens Industries Inc. LLC. EPA ID No: AZD982441263.
  • CEI Report: Siemens Water Technologies Corporation (pdf) (1.48 MB, May 25, 2011)
    Compliance Evaluation Inspection (CEI) for Siemens Water Technologies Corporation. EPA ID No: AZD982441263.
  • CEI Report: Siemens Water Technologies Corporation (pdf) (1.24 MB, September 14, 2009)
    Compliance Evaluation Inspection Report (CEI) for Siemens Water Technologies Corporation. EPA ID No: AZD982441263.
  • CEI Report: Siemens Water Technologies Corporation (pdf) (683.25 KB, May 14, 2008)
    Compliance Evaluation Inspection (CEI) Report for Siemens Water Technologies Corporation. EPA ID No: AZD982441263.
  • Consent Agreement and Final Order (CA/FO): Siemens Water Technologies Corporation (pdf) (648.61 KB, June 2006)
    Consent Agreement and Final Order in the matter of Siemens Water Technologies Corporation. EPA ID No: AZD982441263.
  • CEI Report: US Filter/Westates Carbon (pdf) (39.86 KB, March 15, 2004)
    Compliance Evaluation Inspection (CEI) Report for US Filter/Westates Carbon. EPA ID No: AZD982441263.
  • CEI Report: US Filter/Westates Carbon (pdf) (36.68 KB, July 24, 2003)
    Compliance Evaluation Inspection (CEI) Report for US Filter/Westates Carbon. EPA ID No: AZD982441263.
  • CEI Report: US Filter/Westates Carbon (pdf) (58.28 KB, August 29, 2002)
    Compliance Evaluation Inspection (CEI) Report for US Filter/Westates Carbon. EPA ID No: AZD982441263.
  • CEI Report: US Filter/Westates Carbon (pdf) (105.2 KB, April 5, 2002)
    Compliance Evaluation Inspection (CEI) Report for US Filter/Westates Carbon. EPA ID No: AZD982441263.
  • CEI Report: US Filter/Westates Carbon (pdf) (73.05 KB, August 9, 2001)
    Compliance Evaluation Inspection (CEI) Report for US Filter/Westates Carbon. EPA ID No: AZD982441263.

Other Names

Desotec US LLC has previously been known as Evoqua Water Technologies LLC, Siemens, US Filter, and Westates. The facility is now referred to as Desotec, but the prior names remain in older documents attached to this web page.

Related Content

  • Desotec Home
  • About the Final RCRA Permit
  • Final Permit and Supporting Documents
  • Air Emissions and Risk Assessment
  • Facility Inspections and Enforcement Actions
  • RCRA Permit Application, Draft Permit, Fact Sheets, Risk Assessment and Trial Burn Documents
  • Environmental Appeals Board: Index of Filings

EPA in Arizona

  • Topics and Resources
    • Desotec US LLC (Evoqua)
      • About the Final RCRA Permit
      • RCRA Permit
      • Inspection Reports & Enforcement Actions
      • Air Emissions and Risk Assessment
      • Related Documents
    • Nammo Defense Systems
      • En español
    • Navajo Nation Abandoned Uranium Mines
    • Tuba City Dump
    • U.S.-Mexico Border Program (Border 2025)
Contact Us about EPA in Arizona
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on May 28, 2025
  • Assistance
  • Spanish
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • French
  • Haitian Creole
  • Korean
  • Portuguese
  • Russian
  • Tagalog
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions
  • Site Feedback

Follow.