New Septic Systems for Mattoon Properties
A new septic system is a long-term investment. Getting it right means a proper site evaluation, a design that fits your property and a permit approved before any digging starts.
Septic companies that work across Coles County can guide you through each step and handle much of the paperwork.
The steps of a new septic installation
Expect five stages: site and soil evaluation, system design, permit approval, construction, and inspection before the trenches are covered. Weather and permit review times affect the schedule more than the digging itself, which often takes only a few days once everything is approved.
Conventional and alternative systems
A conventional system is the simplest and usually the least expensive to maintain. Alternative systems add pumps, controls or treatment steps so they can work in difficult soil. Around Mattoon, the soil on your specific lot is what decides which category you fall into.
Permits and approvals
New and replacement systems almost always need a permit. Expect a soil evaluation, a design that meets local code, plan review and at least one inspection during installation. the Coles County health department or your state agency sets the requirements, and many installers handle the application for you.
Why installation prices vary
Installation price depends on the system type the soil allows, the size of the house, the distance from the house to the field, how easy the site is to reach with equipment, and design and permit fees. Engineered systems such as mounds and aerobic units cost more to build and maintain.
Caring for a new septic system
Keep a copy of the design and as-built drawing, schedule your first pumping as recommended, and keep vehicles and structures off the tank and field. Plant only grass over the dispersal area and direct roof and yard runoff away from it. Systems with pumps or treatment units need regular service to stay under warranty.
Before you sign
Make sure the contract lists the system type, the scope of work, permit responsibilities, the timeline, cleanup and warranty. Ask how weather or unexpected site conditions will be handled.
How long the whole project takes
The digging and installation often take days, but the full project in Mattoon can take several weeks once testing, design and permit review are included. Ask your installer for a realistic timeline for your county and what could change it, such as wet weather or a busy review office.
Mistakes to avoid on a Mattoon installation
The most expensive mistakes happen before the digging starts. Skipping the soil evaluation, choosing a system on price alone, or placing the drain field where future driveways, pools or additions will go all lead to trouble later. Undersizing the tank for the number of bedrooms is another common one. Ask your Mattoon installer to walk you through the site plan and explain why each part sits where it does.
Building a system near Mattoon
Homes around Mattoon that are not on public sewer need a septic system sized to the house and the soil. The site evaluation shapes everything that follows, from the tank size to where the field goes. Plan the layout before other outdoor projects so nothing ends up on top of the field.
What Mattoon's soil means for a new system
The USDA soil survey rates most mapped soils near Mattoon as very limited for septic absorption fields. New systems here often need a mound, pressure distribution or another engineered design, which your soil test will confirm. Mattoon averages about 43 inches of precipitation a year, which your designer will factor into where the system goes. About 2 months below freezing mean pipes and components must sit deep enough or be insulated, and installation is usually easiest outside winter.
Local conditions in Mattoon that affect septic installation
Among the mapped soils within about two miles of central Mattoon, the USDA soil survey rates 100% as very limited for septic absorption fields, 0% as somewhat limited and 0% as not limited. The most common drainage class is well drained. Soils like these often call for careful system design, such as a larger drain field, a mound or another engineered system, and a site evaluation before any new installation or replacement.
Mattoon averages about 43 inches of precipitation a year, and June is usually the wettest month. Average temperatures stay below freezing for about 2 months a year, with January averaging 27°F, so tank lids and shallow lines benefit from a layer of snow or mulch rather than being cleared bare.
Sources: USDA NRCS Soil Survey (SSURGO), Soil Data Access; NASA POWER long-term climatology. Soil ratings describe mapped soil types near the city center and do not replace a site evaluation of your property.
What the soil around Mattoon means for septic installation
By drainage class, the USDA soil survey maps the land around Mattoon as 35% well drained, 24% moderately well drained, 17% poorly drained, 17% somewhat poorly drained, 6% very poorly drained. With 40% of the soil poorly drained, a new or replacement field here is often larger or raised, and a soil test comes before any design.
Source: USDA NRCS Soil Survey (SSURGO), Soil Data Access
Septic companies near Mattoon
These are the septic companies in our directory closest to Mattoon, with straight-line distance. Call any of them directly, or send one request and we will pass it to the best match.
- Bruder Tank, Sullivan, IL, 15.9 mi
- Martin Excavating, Hammond, IL, 23.0 mi
- Wasson Septic Service, Shumway, IL, 26.6 mi
- Snearley & Co, Martinsville, IL, 27.5 mi
- Septic Solutions Inc, Dieterich, IL, 28.7 mi
- Riley's Sewer Service, Decatur, IL, 40.8 mi
Septic Installation in nearby towns
We also cover septic installation in these towns near Mattoon:
About Mattoon, IL
Mattoon is in Coles County, Illinois. About 16,560 people live there, across 10.3 square miles of land (about 1,606 per square mile).
Septic Installation questions in Mattoon
- Can I install a septic system myself?
- Most areas require licensed designers or installers and inspections. Check with the Coles County health department before planning any work yourself.
- What is a mound system?
- A mound system raises the drain field above the natural soil using sand and fill. It is used where the soil is too shallow, too wet or too slow draining for a conventional field.
- Can a replacement system go in the same place?
- Sometimes. It depends on the condition of the soil in the old field and local rules. Many replacements use a new area of the yard.
- Is SepticTank.com the installer?
- No. SepticTank.com connects you with an independent local septic company that serves Mattoon. That company designs, installs and prices the system.