Down Valley Septic & Drain, Inc. Share: Plumbing & Heating Down Valley Septic & Drain, Inc. Rifle, CO 81650 (970) 930-0124 (970) 208-8432 (fax) About Map About We're the longest & largest family owned septic pumping and portable toilet service, sanitation companies in the valley. Our portapotties are clean enough for Mom! What's Nearby? Distance: 5 10 15 20 25 50 mi.