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VanDerWall Engineering Inc. is the sole distributor of Bio-Microbics® products for Lake, Mendocino, Napa, Marin, Solano, Contra Costa and Sonoma Counties.

Bio-microbics® provides innovative and cost effective wastewater and stormwater treatment systems for commercial and private development, including homes and subdivisions, golf courses and agricultural properties.



VanDerWall Engineering Inc. is a distributer for Geoflow® products.

For on-site wastewater effluent disposal sites that have either high groundwater, shallow soil depths, or limited area geoflow subsurface drip systems are used.