Skip to content

New Septic Systems for Joliet Properties

Replacing a failed system or installing one for a new build in Joliet involves more than digging a hole for a tank. Soil testing, system design, permits and inspections all shape the final result.

A local installer can tell you which system types are likely to work on your lot and what the process looks like.

The installation process step by step

It starts with testing the soil to see how well it absorbs water. A designer or engineer then sizes the tank and dispersal area for the number of bedrooms. After the permit is approved, the crew excavates, sets the tank, installs the pipes and field, and schedules an inspection before backfilling.

Types of septic systems

Conventional systems use a tank and a gravity drain field and suit lots with good soil. Where soil is poor, shallow or wet, options include pressure distribution, mound systems, chamber systems, sand filters and aerobic treatment units. Your soil test and local rules decide which types are allowed on your lot.

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 Will County health department or your state agency sets the requirements, and many installers handle the application for you.

What you are paying for in a new system

A new system quote covers the soil evaluation and design, permits, the tank, pipe and field materials, excavation and backfill, and the final inspection. Ask whether site restoration such as grading and seeding is included, and whether the quote assumes a conventional system or an engineered one.

Getting the most from your new system

Good habits protect your investment: spread out laundry, fix leaks promptly, avoid flushing wipes and grease, and pump on schedule. If your system has an alarm, learn what it means and who to call.

Questions for a septic installer

Ask who will do the soil test and design, whether they pull the permit, and which system types they recommend for your lot and why. Ask how long the project will take, what warranty they give, and whether the quote includes restoring the yard. Ask for references from recent jobs near Joliet.

Scheduling a septic installation

Start early if you are building or replacing a failing system. Book the soil evaluation first, since everything else depends on it. Ask your installer how long permits are currently taking with the Will County health department, and plan for weather, especially if the work falls in winter or a rainy season.

Mistakes to avoid on a Joliet 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 Joliet installer to walk you through the site plan and explain why each part sits where it does.

New septic systems in Will County

New and replacement systems in Will County go through the Will County health department, which reviews designs and inspects the work. Soil conditions change from one part of the county to another, so a design that suits a lot in Joliet may differ from one in Rockdale, Shorewood, Crest Hill. A local installer knows those differences.

What Joliet's soil means for a new system

The USDA soil survey rates most mapped soils near Joliet 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. Joliet averages about 39 inches of precipitation a year, which your designer will factor into where the system goes. About 3 months below freezing mean pipes and components must sit deep enough or be insulated, and installation is usually easiest outside winter.

Local conditions in Joliet that affect septic installation

Among the mapped soils within about two miles of central Joliet, the USDA soil survey rates 97% as very limited for septic absorption fields, 3% 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.

Joliet averages about 39 inches of precipitation a year, and May is usually the wettest month. Average temperatures stay below freezing for about 3 months a year, with January averaging 23°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 Joliet means for septic installation

By drainage class, the USDA soil survey maps the land around Joliet as 30% well drained, 23% somewhat poorly drained, 22% moderately well drained, 10% poorly drained, 7% very poorly drained, 4% somewhat excessively drained, 4% excessively 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 Joliet

These are the septic companies in our directory closest to Joliet, with straight-line distance. Call any of them directly, or send one request and we will pass it to the best match.

Septic Installation in nearby towns

We also cover septic installation in these towns near Joliet:

About Joliet, IL

Joliet is in Will County, Illinois. About 150,489 people live there, across 66.1 square miles of land (about 2,276 per square mile).

Septic Installation questions in Joliet

Can I install a septic system myself?
Most areas require licensed designers or installers and inspections. Check with the Will 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.
Do I need a soil test for a new septic system?
Yes, in nearly all cases. The soil evaluation decides what type of system and how large a field your lot can support.
Is SepticTank.com the installer?
No. SepticTank.com connects you with an independent local septic company that serves Joliet. That company designs, installs and prices the system.

Get septic help in Joliet, IL

By submitting this request you agree that SepticTank.com and the local septic company it matches you with may contact you by phone, text or email about your request. Message frequency varies. Message and data rates may apply. Reply STOP to opt out, HELP for help.