Water Quality

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As part of the federal permitting process, a 401 certification – a state review of the water quality impacts associated with the project – is required before the U.S. Army Corps of Engineers can issue its final approval with a 404 permit and Record of Decision.

The first draft of the NISP 401 certification was presented to the Colorado Water Quality Control Division in October 2018 and submitted for their internal review. Northern Water is looking to officially submit its 401 application in January 2019, with the Water Quality Control Division then having to approve, conditionally approve or deny the certification. 

Prior to the final application being submitted in the upcoming months, Northern Water will conduct some additional analyses and refine certain aspects of the project’s mitigation concepts, as well as examine any water quality issues raised during the recent public comment period regarding NISP’s Final Environmental Impact Statement.