Contractor Members Find drilling contractors and water system pump contractors in your area. Go back to directory. Add to Address Book. Darryl Helton Columbia Pump Inc Work 3510 Stearman Avenue Pasco WA 99301 work Work Phone: 509-547-5042work Work Fax: 509-547-2840workfax Work Email: email@example.comINTERNET Categories: Contractors Updated 4 weeks ago. Become a member or contact us for more information about safe use of ground water resources.