Water and Wastewater Utility Engineering

Water System Planning & Design

City of Lewiston, Idaho

The City of Lewiston’s water system serves over 5,500 residential and commercial customers within the City’s boundaries. The surface water treatment plant, which provides approximately 75% of the City’s water supply, is nearing the end of its useful life and exhibiting signs of major deterioration. Mountain Waterworks has managed a multi-discipline team of national engineering subconsulting firms, including Carollo Engineers and McMillen Jacobs Associates, to complete a condition assessment of the process, structural, and electrical systems within the existing treatment plant, and of the raw water intake facility. The current projected water system upgrade costs resulting from this evaluation are anticipated at approximately $30M to $50M. Mountain Waterworks has been hired to design several of the subprojects within the City’s selected project alternatives, focusing on water supply development and distribution system rehabilitation.

Services Provided

  • Water Engineering

  • Utility Master Planning

  • Utility Operational Analysis



City of Lewiston

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