A-1 Sewer Service Inc.Septic service company in Madison, WI

A-1 Sewer Service Inc. is ranked #6 of 13 septic service companies in Madison by CR Score, with 57 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.

A-1 Sewer Service Inc. is open Monday to Friday. Its listed hours are Monday to Friday, 2 AM – 2 PM. It is closed on Saturdays and closed on Sundays. Hours come from the business listing; holiday hours may differ.

Serves Madison and 11 towns within 25 miles: De Forest, Waunakee, Sun Prairie, Monona, Middleton, Cottage Grove, McFarland, Verona, Fitchburg, Oregon and Stoughton. 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.

A-1 Sewer Service Inc. has a rating of 4.8 from 12 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 A-1 Sewer Service Inc. on (608) 249-5845. The business is at 6470 Lake Rd #1, Windsor, WI 53598, Madison, WI. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.