SEBASTOPOL -- A Davis-based environmental services company that focuses on water and wastewater analysis and management acquired Sebastopol-based Environment, Community & Opportunity Network, better known as ECON.

The deal, announced June 26, gives West Yost Associates more expertise in Northern California capital improvement, water resource and redevelopment projects, ECON's specialties, according to the companies.

"ECON has been a teaming partner with West Yost for many years," said Charles Duncan, president of West Yost. "In joining West Yost, ECON will bolster our groundwater and water resource expertise and expand our service offerings in state-of-the-art database and geographic information systems (GIS) services, groundwater and soils testing, and watershed mapping and management."

West Yost shares 15-year-old ECON's commitment to client service, according to Andy Rodgers, president of ECON. The latter's clients include the construction industry, municipalities, government and public-interest entities.

"(W)e look forward to bringing the full range of water services West Yost provides to our existing clients," he said in a statement.

ECON is in its fourth year of providing technical assistance to the Russian River Watershed Association. As of July 1, Mr. Rodgers is serving as its executive director. The firm also is working on capital-improvement projects for the city of Petaluma and providing environmental services to Calpine at The Geysers geothermal power plant straddling Sonoma and Lake counties and to Novato School District.

The firm also is working on the Santa Rosa Groundwater Master Plan and conducted environmental assessments for Petaluma under its federal brownfields grant.

The combined company has 110 employees. West Yost has offices in Santa Rosa, Pleasanton, Walnut Creek, Fresno and Eugene, Ore.