PrestonPipelines | PrestonElectric | DirtMarket The Preston Companies bring extensive expertise and hands-on partnership to complex projects. Our services include excavating and installing underground wet and dry utilities, soils testing and management, and fill site management. Our mission, vision, and values define us. We are committed to building strong customer relationships based on outstanding service, integrity, and quality. Our dedicated, highly professional staff takes a proactive approach to recognizing your needs and exceeding your expectations on every project. Hard work, honesty, loyalty, and talent are highly valued and rewarded at all Preston Companies. All people including customers, suppliers, and fellow employees deserve to be treated with the utmost courtesy, concern, and respect. As a Silicon Valley Best Place to Work, we give our people the autonomy and responsibility to do their jobs, and encourage collaboration and teamwork to find the best solutions possible. But most importantly, we demand that safety never be compromised. We make safety a priority in all of our processes and procedures, and invest in training to minimize the chances of accidents.