Cascade Septic Tank ServiceSeptic service company in Portland, OR

Cascade Septic Tank Service is ranked #4 of 77 septic service companies in Portland by CR Score, with 61 out of 100 as of November 2026. The score weighs reputation, credentials, review volume, recency, availability, trade focus, proximity, claimed profile, partnered and ContractorsRanked reviews. No business can pay to change its rank.

Cascade Septic Tank Service is open 7 days a week. Its listed hours are Monday to Sunday, 7 AM – 7 PM. On Saturdays it is open 7 AM to 7 PM, and on Sundays 7 AM to 7 PM. Hours come from the business listing; holiday hours may differ.

Serves Portland and 12 towns within 25 miles: Sandy, Damascus, Molalla, Clackamas, Gresham, Oregon City, Happy Valley, Gladstone, West Linn, Jennings Lodge, Oatfield and Troutdale. The list is based on the business's location and the usual service radius for septic and sewer service. Confirm your address is covered when you call.

Cascade Septic Tank Service has a rating of 5.0 from 81 Google reviews. The CR Score adjusts the star rating for review count, so a high rating from a few reviews counts for less than the same rating from many.

Call Cascade Septic Tank Service on (503) 630-6659. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.