Snoqualmie Pass Utility District - Phase 1 MBR

Snoqualmie Pass Utility District - Phase 1 MBR Wastewater Treatment Plant Improvements

HLA prepared an engineering report for the Snoqualmie Pass Utility District (District) to address improvements and eliminate use of a forest sprayfield. Phase 1 of the recommended membrane bioreactor (MBR) treatment process will be used as a pilot test to size future facilities and later be converted to process waste sludge. 

Improvements included construction of a new MBR treatment process building, new office facilities, and a separate headworks building. Both buildings were constructed to handle the extreme snow loads found at the Pass. MBR equipment was pre-purchased so construction and installation could take place during the short summer season. Phase 1 was completed in 2022.

HLA provided USDA - RD funding application assistance, engineer’s estimate, design, plans, specifications, bidding support, construction survey, inspection, and administration.

Sources of Project Funding:

Total Project Cost: 


HLA Engineering and Land Surveying

2803 River Road
Yakima, WA 98902

(509) 966-7000
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