Mission Septic And DrainSeptic service company in O'Fallon, MO

Mission Septic And Drain is ranked #1 of 38 septic service companies in O'Fallon by CR Score, with 64 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.

Mission Septic And Drain is open 24 hours a day, 7 days a week. Its listed hours are Open 24 hours, 7 days a week. On Saturdays it is open Open 24 hours, and on Sundays Open 24 hours. Hours come from the business listing; holiday hours may differ.

Serves O'Fallon and 6 towns within 25 miles: Troy, Wentzville, Lake Saint Louis, Dardenne Prairie, Warrenton and Saint Peters. 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.

Mission Septic And Drain has a rating of 5.0 from 112 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 Mission Septic And Drain on (636) 970-9192. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.