Septic Systems — Installation and Repair Across SW Missouri
Calvin Smith Excavating is a DHSS-registered septic installer (#39658) serving Walnut Grove, Springfield, Republic, Bolivar, Ash Grove, Willard, Nixa, Ozark, and the surrounding southwest Missouri area. We install new conventional gravity septic systems and handle all repair scopes on existing systems of any type. Advanced (aerobic) system installation begins late August 2026.
Request a Free Site Walk
Tell us whether you need a new septic install or a repair scope and we will follow up to schedule your free on-site evaluation.
What We Do
Conventional installs now, full repair scope now, advanced aerobic installation beginning in late August 2026.
Septic System Installation
New conventional gravity systems for residential properties. Full project handling — site walk, soil evaluation coordination, permit application, excavation, tank install, drainfield construction, final inspection. Costs vary based on site conditions — call (417) 719-0643 for a free site walk and itemized quote.
Septic System Repair
Tank repair, drainfield repair, line replacement, riser installation, distribution box work, and emergency response on failing systems. We work on conventional and advanced systems regardless of who installed them originally. Scope and cost vary based on what’s failed — call (417) 719-0643 for a free diagnostic.
Coming Late August 2026: Advanced (Aerobic) System Installation
DHSS-approved aerobic treatment unit installation for sites where conventional systems don’t work — shallow bedrock, slow-percolating soil, small lots, or proximity to creeks. We’re completing certification through August 2026 and will be installing these systems with annual service contracts thereafter.
Why Hire Calvin Smith Excavating for Septic Work
Registered, insured, owner-operated, and local to the same southwest Missouri footprint Calvin already serves for excavation work.
Local, Registered, and Owner-Operated
When you hire Calvin Smith Excavating for septic work, you are working with the same local operation already serving southwest Missouri excavation and site-prep clients. Calvin is the one on site running the equipment, and the project scope is quoted in writing before work begins.
County familiarity: Greene, Polk, Christian, and Webster.
DHSS Registration and Insurance
DHSS Registration #39658
Legally authorized to install in every county we serve, including Greene County which requires registered installers.
USDOT #4119419
Fully registered carrier for material hauling.
Owner-Operated
When you hire us, Calvin is the one on site running the equipment.
Full Insurance
General liability with certificate available on request.
Local Service Area
Same service area as our excavation work — local SW Missouri operation, not driving hours from a metro area.
Honest Scope and Pricing
Itemized quotes, written rock contingency, no surprise charges.
How the Process Works
From the free site walk through final inspection, the process stays clear and written out up front.
01
Free Site Walk
We come to your property, look at access, soil exposure, terrain, distance from house, and any obvious obstacles. Free, no obligation.
02
Soil Evaluation
Either through the county health department or a private certified evaluator. Required before design.
03
Permit Application
We prepare and submit the application to your county health department with the soil report and proposed system design.
04
Itemized Quote
Itemized quote covering excavation, tank, drainfield, fittings, permit pass-through, and rock contingency language.
05
Schedule and Install
Typical install takes 2–5 days of active work once permits are approved.
06
Final Inspection
County inspection and as-built drawing filed.
Service Area
We serve septic work across the same area as our excavation services: Walnut Grove, Springfield, Republic, Bolivar, Ash Grove, Willard, Nixa, Ozark, and the surrounding southwest Missouri area roughly within a 50-mile radius of Walnut Grove.
County familiarity: Greene, Polk, Christian, and Webster.
Get a Free Site Walk
Call (417) 719-0643 for a free on-site evaluation of your septic project — new install or repair.
Read our 2026 Septic Installation Cost Guide for SW Missouri to understand what drives the price on a typical project.
#39658
Missouri DHSS registration
Now
Conventional installs available
Late Aug 2026
Advanced aerobic installs begin
(417) 719-0643
Free site walk call to action
Talk Through Your Septic Project
Septic Systems FAQ
Straight answers about what we install, what we repair, and how the process typically works in southwest Missouri.
Do you install new septic systems in southwest Missouri?
Yes. We install new conventional gravity septic systems for residential properties across southwest Missouri and manage the project from site walk through final inspection.
Do you repair systems you did not originally install?
Yes. We handle repairs on conventional and advanced systems regardless of who installed the system originally.
What septic systems do you install right now?
Conventional gravity systems are available now. Advanced aerobic system installation begins in late August 2026.
What does a new septic install usually cost?
Conventional install cost varies based on soil conditions, rock encounters, access, tank size, and drainfield design. For the full breakdown of what affects pricing, see our 2026 Septic Cost Guide, or call (417) 719-0643 for a free site walk.
What do septic repairs usually cost?
Repair scope depends on whether the issue is a line, riser, distribution box, tank component, or part of the drainfield. Call (417) 719-0643 for a free diagnostic site walk.
How does the process usually work?
We start with a free site walk, coordinate the soil evaluation, prepare the permit application, quote the full scope, schedule the work, and finish with final inspection and as-built filing.
Which county health departments are you familiar with?
We serve Walnut Grove, Springfield, Republic, Bolivar, Ash Grove, Willard, Nixa, Ozark, and the surrounding southwest Missouri area, roughly within a 50-mile radius of Walnut Grove.
How do I schedule a site walk?
Call (417) 719-0643 to schedule a free on-site evaluation. We will walk the site, explain the scope, and quote the work in writing.