Les Petersen Drilling & Pumps began serving the water needs of Northern California residents, businesses and municipalities in 1946. Much has changed since 1946, but two things remain constant - people?s need for access to dependable water systems and the commitment of Petersen Drilling & Pump to provide state-of-the art services at competitive rates. Les Petersen Drilling & Pump offers a complete range of water system services including design, development, construction, installation and equipment sales and repair.