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Contact Pacific Southwest Waste Program

Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Evoqua Water Technologies
(formerly Siemens Carbon Regeneration Facility)


Mapping capability for many kinds of sites, including hazardous waste, superfund, etc.

Evoqua Identification

RCRA ID Number: AZD982441263
2523 Mutahar Street
Parker, AZ 85344
La Paz County

Evoqua Water Technologies (or “Evoqua”) is a carbon regeneration facility located on the Colorado River Indian Reservation near Parker, Arizona. US EPA is responsible under the Resource Conservation and Recovery Act (RCRA) for permitting facilities that process hazardous wastes on tribal lands.

Evoqua uses thermal treatment to regenerate spent carbon so that it can be used again, and has been treating spent carbon since 1992. Each year, this facility receives over 5,000 tons of spent carbon from 30-35 states across the United States. About 11% of this spent carbon is considered hazardous waste under EPA regulations.

The Evoqua carbon regeneration facility is currently operating under “interim status” as set out under RCRA regulations. Interim status was triggered by the Facility’s submittal of an initial Part A Permit Application, which was endorsed by the Colorado River Indian Tribes (CRIT). CRIT also signed as co-applicant on the Part B permit application, which requests final permit status, on December 14, 2009. This restarted the permit application review which was on standby until the CRIT signature was received.

US EPA reviewed the Part B application and transmitted comments to Evoqua in September of 2011 and December of 2011. Evoqua revised the Part B application to incorporate both sets of EPA comments, and resubmitted the revised application to EPA on April 26, 2012. After review, EPA sent additional comments to Evoqua on the April 2012 Part B application. Evoqua sent a response to the comments and revised Part B application on July 22, 2014, with additional information remaining to be submitted.

EPA is currently reviewing the full application for completeness and technical adequacy as part of the permit decision-making process. After the review has been completed, EPA may issue or deny a permit to allow Evoqua to continue processing hazardous waste. See the full application »

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

Contact Information

Evoqua Water Technologies

If you have questions or concerns about Evoqua or about EPA's permit process, please let us know by phone, email, or letter.

"Mike" Mahfouz Zabaneh, P.E. (Zabaneh.Mahfouz@epa.gov)
(415) 972-3348
Environmental Engineer/Project Manager
RCRA Facilities Management Office
75 Hawthorne Street
Mail Code WST-4
San Francisco, CA 94105
FAX: 947-3533

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