Top-rated septic system installers and replacers.

Get matched with top septic system installers and replacers in Saint-louis, MO

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Find Septic system installers and replacers in Saint-louis

A & M Septic and Excavating, LLC
4.2(
29
)

Serving Saint-louis, MO and surrounding areas

Approved

In business since 2003

Free estimates

Customers say: Quality work

"We were having trouble with our septic system and called a competitor of A&M three different times. They told us over the phone three different times that there was no problem with our system, it was just a wet year (without ever coming to look at our system). When I called A&M, they responded immediately - inspected the system the very next day and discovered the distribution box was completely corroded and not functioning. They arranged for our system to be pumped by ALL STAR Pumping (also great work!) and replaced the distribution box - problem solved within two working days! The results were obvious in our yard within a couple days. Great professionalism, great service, and great value. Don't settle for less with the competitors, A&M Septic does great work."
Septic pump fix
New pump and line
Lagoon clean up
Lagoon clean up
Water proof riser

+5

Response time2 days
41 neighbors recently requested a quote
Recommended by72%of homeowners
Request Quote
FAQs for septic system installation and replacement projects in Saint-louis, MO

The smallest standard septic system uses a 500-gallon tank, which costs between $875 and $1,150 installed. This size works well for single-occupant dwellings with minimal wastewater production. However, many local regulations specify minimum tank sizes, so check with your building department before committing to this compact option. Some jurisdictions require at least 750 gallons regardless of home size to ensure adequate waste processing capacity.

The installation timeline varies based on site conditions, permit processing, and contractor schedules. The process includes obtaining permits, conducting soil tests, excavation, tank placement, leach field construction, and final connections. Weather conditions, soil challenges, and inspection scheduling can all affect the overall timeline. It's wise to begin planning well in advance of when you need the system operational.

The most economical approach is to install a conventional anaerobic system with a plastic tank. To minimize costs while maintaining legality, obtain multiple quotes from licensed installers, consider scheduling during their slower seasons, and handle basic site preparation yourself. Never skip permits or required testing to save money—illegal installations can result in significant fines and mandatory removal, ultimately costing far more than doing it right initially.

Regular pumping helps prevent system failures and extends operational life. Most small systems require pumping every three to five years, though frequency depends on household size and usage patterns. Pumping services cost between $290 and $530, making this maintenance expense relatively minor compared to potential repair costs ranging from $500 to $2,600 for neglected systems. Establishing a regular maintenance schedule based on your installer's recommendations helps avoid costly emergency services.

The Saint-louis, MO homeowners’ guide to septic system installations and replacements

From average costs to expert advice, get all the answers you need to get your job done.

See all articles