Illinois Well Drilling Cost 2026: $7,350 Avg + $28-$60/ft

Bottom line: Water well drilling in Illinois costs $28–$60 per foot in 2026, with the average residential project running $7,350 complete. Illinois’s typical well depth is 175 feet (range: 40–500 ft), and the primary aquifer is the Mahomet Aquifer (glacial sand and gravel) / Cambrian-Ordovician Aquifer System.

This guide covers 2026 Illinois well drilling pricing — by depth, region, and project scope — plus the geology, permit rules, licensing requirements, and seasonal considerations that affect every Illinois well project.

Illinois Well Drilling Cost at a Glance

Cost Factor	Illinois 2026
Average total project cost	$7,350
Cost per foot (drilling only)	$28–$60
Average residential well depth	175 feet
Typical depth range	40–500 ft
Primary aquifer	Mahomet Aquifer (glacial sand and gravel) / Cambrian-Ordovician Aquifer System
Water table depth	20-100 feet in glacial drift; 200-1,500 feet for deep bedrock aquifers in northern Illinois
Permit cost range	$50-$200
Best drilling months	March through November

Cost by Well Depth in Illinois

These ranges use Illinois’s typical per-foot cost ($28–$60, average $42) plus standard pump/casing/electrical hookup ($2,500–$5,000). Final cost depends on geology, water yield, and pump sizing.

Well Depth	Illinois Drilling Cost	Complete System
100 ft (shallow)	$2,800–$6,000	$5,300–$11,000
175 ft (typical)	$4,900–$10,500	$7,400–$15,500
300 ft (moderate)	$8,400–$18,000	$10,900–$23,000
500 ft (deep)	$14,000–$30,000	$16,500–$35,000

For a complete national breakdown, see our well drilling cost per foot guide or the main well drilling cost guide.

Illinois Geology and Drilling Conditions

Illinois is covered by thick glacial drift deposits — till, sand, and gravel laid down by multiple ice advances — which provide the primary source for shallow wells. Deeper bedrock wells tap Silurian dolomite, Cambrian-Ordovician sandstones, or the St. Peter Sandstone aquifer.

The Mahomet Aquifer (glacial sand and gravel) / Cambrian-Ordovician Aquifer System is Illinois’s primary source of residential well water. Water table depth ranges from 20-100 feet in glacial drift; 200-1,500 feet for deep bedrock aquifers in northern Illinois, which directly affects how deep your well must be drilled. Wells targeting deeper aquifers cost proportionally more — both for the additional drilling time and for heavier-duty pumps required to lift water from greater depths.

Common Water Quality Issues in Illinois

Illinois well water frequently contains: iron, manganese, hardness, radium in deep bedrock wells, and nitrate near agricultural areas.

These contaminants don’t always make water unsafe — many are aesthetic (iron staining, hardness) rather than health concerns — but they affect treatment system requirements:

• Iron and manganese are the most common nuisance contaminants. Treatment: oxidation filter or water softener with iron-removing resin ($800–$2,500 installed).
• Hardness (calcium, magnesium) requires a water softener ($800–$2,500 for whole-house systems). See our water softeners guide.
• Hydrogen sulfide (“rotten egg” smell) is treated with aeration or chlorination ($500–$2,000).
• Bacteria (coliform, E. coli) require shock chlorination plus UV disinfection or chlorination injection ($500–$1,500).
• Arsenic, uranium, radon are health-critical contaminants requiring specific treatment systems and ongoing testing.

Always test new wells for the full panel before connecting to your home’s plumbing. See our well water test kits guide for testing options.

What’s Included in a Illinois Well Drilling Quote

A typical Illinois well drilling quote covers:

• Drilling and casing — the well bore (steel or PVC casing)
• Well screen — filters out sand and sediment at the water-bearing zone
• Grout seal — cement seal around the casing to prevent surface contamination
• Development — flushing to maximize water yield
• Well cap — sanitary seal at the top

Not typically included (budget separately):

Additional Cost	Price Range
Submersible pump + installation	$1,000–$3,500
Pressure tank	$300–$1,500
Electrical hookup	$500–$1,500
Water line to house	$500–$3,000
Water testing (full panel)	$200–$500
Treatment system (if needed)	$500–$5,000

A complete Illinois well system with pump, pressure tank, and connections typically runs $9,850–$32,500 for average depths.

Permits and Licensing in Illinois

Permitting: Well drilling permits in Illinois are administered by County Health Departments issue permits under Illinois Department of Public Health regulations; Illinois EPA oversees water quality. Permit costs run $50-$200 depending on county and well type.

Licensing: Illinois requires all water well drillers to be licensed by the Illinois Department of Public Health. Licensed well and pump installers must pass written exams and complete continuing education.

Water rights: Illinois follows the Reasonable Use doctrine for groundwater. Understand the rules before drilling — exempt wells (typically domestic under a stated GPM threshold) often have simpler permitting, while higher-yield or commercial wells require full appropriation procedures.

Best Time to Drill in Illinois

March through November; winter drilling is possible but frost depths of 3-4 feet and muddy conditions slow progress

Driller schedules typically fill 4–8 weeks in advance, especially in peak season. Book early if your timing is flexible. Off-season drilling (where climate allows) sometimes captures 5–15% labor savings.

How Many Illinois Households Use Well Water

About 14% of Illinois households use private wells, mainly in rural central and southern Illinois

This concentration directly affects driller availability — counties with high private-well density (typically rural areas, certain river basins, mountain regions) have more drillers competing for work and more competitive pricing. Metro areas with mostly municipal water often see fewer drillers and higher per-foot rates.

Top Cities for Well Drilling in Illinois

The largest residential well drilling markets in Illinois include Chicago, Aurora, Rockford, Springfield, and Champaign. Pricing varies more by sub-region (driven by geology and well-density) than by metro area in Illinois. For driller listings by city, browse our Illinois well driller directory.

How to Save Money on a Illinois Well

1. Get at least 3 quotes. Per-foot rates vary 20–40% between drillers for the same well. Request 3 free quotes from licensed Illinois drillers.
2. Check with neighbors first. Nearby wells give you a realistic depth estimate — the biggest cost driver. Drillers in Illinois typically have permit records you can search to find depth data near your property.
3. Ask about depth guarantees. Some Illinois drillers cap their quote at an agreed depth — if they hit water shallower, you save; if they drill deeper, they absorb the cost.
4. Bundle the work. Hiring one company for drilling + pump + electrical hookup typically saves $500–$1,500 vs separate contractors.
5. Don’t skimp on the pump. A properly sized submersible pump costs more upfront but lasts 12–20 years vs 5–8 years for budget pumps in Illinois’s typical depth range. See our submersible pumps guide.

Frequently Asked Questions

How much does a well cost in Illinois?

The average Illinois residential well costs $7,350 complete with pump and connection. Drilling alone runs $28–$60 per foot. A typical 175-foot well costs $4,900–$10,500 for drilling, plus $2,500–$5,000 for pump and hookup.

How deep are wells in Illinois?

The average residential well depth in Illinois is 175 feet, with most wells ranging from 40–500 feet depending on geology and target aquifer. Wells in the Mahomet Aquifer (glacial sand and gravel) typically hit water sooner; deeper aquifers require correspondingly longer drilling.

Do I need a permit to drill a well in Illinois?

Yes — County Health Departments issue permits under Illinois Department of Public Health regulations; Illinois EPA oversees water quality regulates well drilling in Illinois, with permits costing $50-$200. Some exempt wells (typically domestic use under a stated GPM threshold) have simpler procedures, but most residential wells require full permits before drilling can begin.

Can I drill my own well in Illinois?

Illinois requires all water well drillers to be licensed by the Illinois Department of Public Health.

How long does it take to drill a well in Illinois?

Most residential wells in Illinois are completed in 1–3 days of actual drilling. Including pump installation, electrical, and plumbing, plan on 1–2 weeks for the full project. Permit approval typically adds 2–6 weeks before drilling can start.

Is Illinois well water safe to drink?

Illinois well water is generally safe when properly tested and treated for the local quality issues (iron, manganese, hardness, radium in deep bedrock wells, and nitrate near agricultural areas). Private well owners are responsible for testing — there’s no government oversight like there is for municipal water. Test annually for bacteria and nitrates; do a full chemical panel every 3–5 years and immediately after any nearby construction or land use change.

How long do wells last in Illinois?

Properly drilled and maintained wells in Illinois typically last 30–50 years for the well bore itself. The pump is the most common component to fail — premium submersibles last 12–20 years; budget pumps 5–10. Pressure tanks last 8–15 years. Routine pump and pressure tank replacements add up to a fraction of the original drilling cost over the well’s life.

Get a Illinois Well Drilling Quote

The fastest way to know your actual cost is to get quotes from licensed Illinois drillers familiar with your specific area’s geology. Request 3 free estimates.

For more on related topics, see our main well drilling cost guide, well pump costs, or browse Illinois well drillers.