Moses Lake Wastewater Treatment Plants

Project Overview

The Larson plant is a 0.75 MGD facility designed to meet advanced effluent standards and used to recharge groundwater. 

Project work included, industrial waste surveys, developing Facility Plans, Prequalification of Contractors, design and build for wastewater treatment facilities consisting of mechanical screening, activated sludge, aerobic sludge digestion, stand-by generator, sludge dewatering, UV disinfection, influent lift station, rapid infiltration, and related facilities.

The Sand Dunes plant is a 4.0 MGD facility designed to meet advanced effluent standards and used to recharge groundwater. Plant consists of two Biolac Activated Sludge treatment systems, Trojan UV disinfection, mechanical screening with aerated grit chamber, and Long Term Biosolids Digestion Basin (LTBDB).

Includes rangeland enchancement by surface application of Biosolids.

Client Contact

Mr. Gerry McFaul, P.E., City Engineer
Phone: (509) 754-5088 ext. 3148
(now with Grant County PUD No.2)


Moses Lake, WA

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