Wastewater Treatment Odor Control

UPDATE (11/22/19): Golden and MillerCoors staff had a routine update call on November 22. MillerCoors is moving forward with the short-term solutions they identified to address odors. They intend to modify the wastewater treatment process to include chemical addition of an oxidizer, however such a modification requires State of Colorado approval. The actual timing of the change depends on when MillerCoors receives approval from the state.

MillerCoors is also working on long-term solutions. Their consultant is on schedule for delivery of a final report in late December. That report will include recommendations and costs for projects at both plants to

UPDATE (11/22/19): Golden and MillerCoors staff had a routine update call on November 22. MillerCoors is moving forward with the short-term solutions they identified to address odors. They intend to modify the wastewater treatment process to include chemical addition of an oxidizer, however such a modification requires State of Colorado approval. The actual timing of the change depends on when MillerCoors receives approval from the state.

MillerCoors is also working on long-term solutions. Their consultant is on schedule for delivery of a final report in late December. That report will include recommendations and costs for projects at both plants to address odor sources identified by the consultant’s evaluation. MillerCoors intends to pursue funding based on recommendations in the report in February, with the potential for implementation later in 2020. Golden’s next call is scheduled for January 2020, which will be a good time to firm up projects and implementation timelines.

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UPDATE (11/5/19): MillerCoors has been keeping staff updated on their efforts to evaluate both short-term and long-term modifications to the wastewater treatment plants to control odors. Short-term solutions are those that can be implemented prior to spring 2020 and long-term solutions are capital projects that may take several years to complete. MillerCoors has been working with a consultant on two short-term solutions and is moving forward with implementation of one, while continuing to evaluate the other.

MIllerCoors plans a treatment change – the addition of an oxidizer – that can be installed by spring. This change will require approval by the Colorado Water Quality Control Division and the start date will depend on when MillerCoors receives that approval. In the meantime, MillerCoors continues to staff the Odor Hotline (number below) and keep Golden staff updated on other long- and short-term odor solutions.

Please continue to report odor hot spots on the map below. This tool has been helpful to Golden and MillerCoors staff in understanding odor issues and days when odors are more noticeable in the city.

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UPDATE (8/29/19): On Wednesday, August 28, 2019 at a meeting with MillerCoors representatives, City Council shared frustration regarding odor at the wastewater treatment facility. Multiple concerns were expressed regarding this summer’s odors. The MillerCoors waste water treatment facility treats some waste water from the City of Golden, and treats brewery waste. MillerCoors indicated that they are aware of odor concerns and expressed willingness to evaluate plant modifications to reduce odors.

Staff from the City and MillerCoors met later the same day. During that meeting, the following commitments were made:

  • MillerCoors will respond to calls made to the Odor Hotline (303-277-2112). The message on the hotline will be changed to request specific location data to help MillerCoors verify odor sources. The waste water treatment unit operations are separated by distance.
  • MillerCoors recently hired an environmental consultant specializing in air pollution and odors. The consultant will investigate sources of odors at the waste water treatment facility.
  • Golden and MillerCoors staff will check in monthly to discuss progress made during the month and focus on communication with the community. We will post relevant updates on this page.
  • MillerCoors’ goal is to implement odor reductions.

Jefferson County Health Department conducted odor monitoring at the brewery on multiple days. This monitoring did not show any health violations at the brewery. While the health department inspections lead to no violations, MillerCoors affirms its commitment to the work to minimize the emission of odorous gasses.

Odor Hot Spots

5 months

Noticed the sewage smell especially strong somewhere? Tag the map and let us know where. We'll pass the information along to MillerCoors, which will help them pinpoint problem areas and work on fixing them.

Noticed the sewage smell especially strong somewhere? Tag the map and let us know where. We'll pass the information along to MillerCoors, which will help them pinpoint problem areas and work on fixing them.