Contractor Members Find drilling contractors and water system pump contractors in your area. Go back to directory. Add to Address Book. Roy Jensen Foremost Pump & Well Service P O Box 3111 Union Gap WA 98903 work Work Phone: 509-966-0814work Work Fax: 509-853-0025workfax Work Email: email@example.comINTERNET Categories: Contractors Updated 3 years ago. Become a member or contact us for more information about safe use of ground water resources.