From Wyoming Department of Environmental Quality <[email protected]>
Subject Public Notice: Categorical Exclusion Determination, City of Buffalo, WY, Microfiltration System Module Replacement Project
Date January 22, 2026 3:01 PM
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Categorical Exclusion Determination, City of Buffalo, WY, Microfiltration System Module Replacement Project



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Categorical Exclusion Determination, City of Buffalo, WY, Microfiltration System Module Replacement Project

The Department of Environmental Quality/Water Quality Division (DEQ) has conducted a review of the proposed Microfiltration System Module Replacement project in accordance with EPA and State of Wyoming procedures for implementing the State Environmental Review Process. DEQ has determined that this project is eligible for a categorical exclusion. Accordingly, DEQ is exempting the project from further substantive environmental review requirements under the State Environmental Review Process. Neither an Environmental Assessment/Finding of No Significant Impact nor an Environmental Impact Statement/Record of Decision will be required for the proposed action. The following is a brief description of the situation and the proposed action and a brief statement of how the action meets the criteria for a categorical exclusion.

The City of Buffalo water treatment plant contains a microfiltration system with three modules that are approaching the end of their useful life. This project will include the removal and replacement of the three modules, a new Operating Protocol, and an updated system process and instrumentation diagram. The city is applying for a Drinking Water State Revolving Fund loan in the amount of *$1,000,000* with potential principal forgiveness and an interest rate of .75%. The loan payments will be paid by water fund reserves and water user rates. Rates will be adjusted as needed to service loan payments.

The City of Buffalo is aware of and accepts the fact that they will be responsible for any required mitigative actions associated with and including storm water runoff, erosion control, archeological/historic artifacts, and air quality concerns. These will be part of the standard State Revolving Fund Program contract conditions. There are no noteworthy environmental issues/impacts/mitigation issues.

DEQ is granting an exclusion because the project is the replacement of microfiltration modules completely contained within existing facilities. DEQ has determined that exempting the proposed project from further review under the State Environmental Review Process will not result in adverse impacts to the population or the area of the City of Buffalo, Johnson County, Wyoming.

The determination shall become effective upon distribution by the Department and may be re-evaluated and the determination changed at any time that adverse information is made available. The documentation to support this decision will be on file in the DEQ Cheyenne Office and is available for public review upon request. To request a copy of the categorical exclusion, contact:

Tim Eisenhauer, Principal Engineer
Greg Crocker, SRF Project Manager
Department of Environmental Quality
200 W. 17th St.
Suite 200
Cheyenne, WY 82002
Tel. (307) 777-6941
FAX (307) 635-1784
 [email protected]  <[email protected]>                                                                          [email protected]

*Para español, visite* deq.wyoming.gov. [ [link removed] ] "Americans with Disabilities Act: special assistance or alternative formats will be made available upon request for individuals with disabilities."


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This email was sent to [email protected] using GovDelivery Communications Cloud on behalf of: Wyoming Department of Environmental Quality · 200 West 17th St.· Cheyenne, WY 82002 GovDelivery logo [ [link removed] ]
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