Keep Your System Running Without Surprises

Full septic installation, pumping, and repair service in the Illinois Valley and the surrounding areas

When your property in the Illinois Valley relies on a septic system, you need installation that follows local soil conditions and repairs that address the actual problem before it spreads. Whether you are building on a rural lot or replacing a system that has reached the end of its service life, the work starts with understanding what your site can support and what the county will approve.

Gillan Construction LLC handles septic system installation for commercial and rural properties, including site evaluation, soil testing, permitting coordination, and code-compliant tank and drainfield placement. We also provide routine pumping to prevent solids from entering your drainfield, system repairs when components fail, and full replacements when repair is no longer practical. If your system is backing up, draining slowly, or surfacing wastewater, we assess the cause and recommend the right fix.

If you need a system evaluation or want to schedule pumping in the Illinois Valley, contact us to review your property and timeline.

What the Work Involves and What Changes

Installation begins with a site evaluation that includes soil percolation testing and setback measurements to determine where the tank and drainfield can go. In the Illinois Valley, soil composition affects how quickly water drains and how large the drainfield needs to be. We coordinate permits, excavate the site, set the tank, and install lateral lines that distribute wastewater evenly across the drainfield.

Once the system is operational, wastewater flows into the tank where solids settle and treated effluent moves into the drainfield for natural filtration. You will notice that toilets flush normally, drains clear without hesitation, and there is no standing water or odor near the drainfield. Routine pumping every three to five years prevents solids from clogging the outlet and keeps the system functioning as designed.

Repairs may include replacing a pump, fixing broken baffles, or addressing drainfield saturation caused by overuse or compacted soil. We explain what failed, what needs replacement, and how long the repair will extend the system's usable life. If the drainfield is failing and cannot be salvaged, we recommend a full replacement with updated components that meet current code.

Questions That Come Up During Planning

Septic systems involve soil conditions, permitting timelines, and maintenance schedules that vary by site, so most property owners have questions before moving forward with installation or repair.

How do you determine the right system size?

We calculate system size based on the number of bedrooms or fixtures your property will support and the results of your soil percolation test. The Illinois Valley soil conditions affect drainfield size and placement.

What happens during a routine pumping?
We pump out the accumulated solids from your tank using a vacuum truck, inspect the baffles and outlet, and note any signs of structural damage or high water levels that suggest a drainage problem.
When should I schedule a system inspection?
You should schedule an inspection if you notice slow drains, gurgling pipes, sewage odors, or wet spots near the drainfield. These indicate a blockage, pump failure, or drainfield saturation.
What does site evaluation include?
Site evaluation includes soil testing to measure percolation rate, identifying setback distances from wells and property lines, and locating underground utilities. Results determine system design and placement.
How long does a new installation take?
Installation typically takes three to five days after permits are issued, depending on excavation conditions and system complexity. Weather and soil moisture can affect the timeline.

Gillan Construction LLC works with property owners in the Illinois Valley who need septic systems installed to code, pumped on schedule, or repaired before small issues turn into drainfield replacement. If you are ready to move forward or need a site assessment, reach out to discuss your property and service needs.