If you own a home in Des Plaines, Mount Prospect, or anywhere along the Des Plaines River corridor, you already know: basement flooding isn’t a matter of “if” — it’s “when.” Chicago’s summer storms can dump 3–5 inches of rain in a single afternoon, and the high water table across the northwest suburbs makes sump pumps a non-negotiable part of home ownership.
At MMDS, we’ve installed and serviced hundreds of sump pump systems across Cook County. This guide covers everything you need to know about choosing, installing, and maintaining a sump pump — plus why a battery backup could save you thousands in water damage.
Why Des Plaines & Mount Prospect Homes Are at Higher Flood Risk
The northwest suburbs sit in a flood-prone zone for several reasons:
- High water table: Many homes in Des Plaines and Mount Prospect were built on clay-heavy soil that doesn’t drain well. When it rains, groundwater rises quickly.
- Aging storm sewers: Infrastructure in many neighborhoods dates to the 1950s–1970s and can’t handle modern rainfall volumes.
- River proximity: The Des Plaines River and its tributaries create additional flood risk during heavy rain events.
- Flat terrain: Unlike hillier suburbs, water doesn’t naturally flow away from foundations here.
According to FEMA, Cook County ranks among the top counties in Illinois for flood insurance claims. A working sump pump is your first line of defense.
Types of Sump Pumps: Which One Is Right for Your Home?
Submersible Sump Pumps
These sit inside the sump pit, fully submerged in water. They’re quieter, more powerful, and last longer than pedestal models. Best for: most Des Plaines and Mount Prospect homes with a standard sump pit.
Pedestal Sump Pumps
The motor sits above the pit on a pedestal. They’re less expensive but louder and less powerful. Best for: narrow sump pits where a submersible won’t fit, or budget-conscious installations.
Battery Backup Sump Pumps
A secondary pump that kicks in when the power goes out — which is exactly when you need it most. During a major storm, ComEd outages are common across Arlington Heights and Des Plaines. Without a battery backup, your primary pump is useless.
Combination Systems
A primary submersible pump paired with a battery backup. This is what we recommend for most homeowners in flood-prone areas. You get the reliability of a powerful primary pump with the insurance of backup power.
Sump Pump Installation Cost in the Chicago Suburbs (2026)
Here’s what homeowners in Des Plaines, Mount Prospect, and surrounding areas can expect to pay:
| System Type | Cost Range (Installed) | Best For |
|---|---|---|
| Basic Submersible | $800 – $1,500 | Homes with existing sump pit |
| Pedestal Pump | $600 – $1,200 | Budget installations |
| Battery Backup Add-On | $800 – $1,500 | Adding to existing primary pump |
| Combination System | $1,500 – $3,000 | New installation with full protection |
| New Sump Pit + Pump | $2,500 – $5,000 | Homes without existing pit |
Financing available: MMDS offers financing through Sunbit and PowerPay, so you can protect your basement now and pay over time. Many customers qualify for payments as low as $50–$80/month.
5 Signs You Need to Replace Your Sump Pump
- It’s more than 7–10 years old. Sump pumps have a limited lifespan. If yours is approaching a decade, replacement before it fails is far cheaper than water damage cleanup.
- It runs constantly or cycles on and off. This usually indicates a stuck float switch, undersized pump, or a check valve problem.
- Strange noises. Grinding, rattling, or thumping sounds mean the motor or impeller is failing.
- Visible rust or corrosion. This is especially common in homes with iron bacteria in the groundwater — prevalent in parts of Mount Prospect and Des Plaines.
- Your basement smells musty or has water stains. Even if you don’t see standing water, these signs mean your pump isn’t keeping up.
Why Battery Backup Is Essential in the Northwest Suburbs
Here’s a scenario we see every summer: A major thunderstorm rolls through Arlington Heights and Des Plaines. Power goes out for 4–8 hours. The rain keeps falling. Without a battery backup, your sump pump sits idle while water fills your basement.
The average basement flood costs $10,000–$25,000 in cleanup and restoration. A battery backup system costs a fraction of that and provides peace of mind during every storm.
Modern battery backup systems can run for 8–12 hours on a full charge, with some premium models lasting up to 24 hours. They also alert you with an alarm when they activate, so you know your primary pump has lost power.
The MMDS Sump Pump Installation Process
- Free in-home assessment: We inspect your current system (if any), check your basement’s drainage, and assess your flood risk.
- Custom recommendation: Based on your home’s specific needs, we recommend the right pump size, type, and whether you need a battery backup.
- Professional installation: Our licensed plumbers handle everything — pit excavation (if needed), pump installation, discharge line routing, and check valve installation.
- Testing and verification: We test the system under load, verify the battery backup kicks in properly, and make sure the discharge line is routed away from your foundation.
- Maintenance guidance: We show you how to test your pump monthly and explain what to watch for.
Sump Pump Maintenance Tips for Chicago Homeowners
- Test monthly: Pour a bucket of water into the pit to make sure the float activates and the pump runs.
- Clean the pit annually: Remove debris, gravel, and sediment that can clog the pump.
- Check the discharge line: Make sure it’s not frozen in winter or clogged with debris in summer.
- Test your battery backup quarterly: Unplug the primary pump and verify the backup activates.
- Replace the battery every 2–3 years: Backup batteries lose capacity over time.
Frequently Asked Questions
How long does sump pump installation take?
A standard installation with an existing sump pit takes 2–4 hours. New pit excavation adds another 2–3 hours. Most jobs are completed in a single visit.
Do I need a permit for sump pump installation in Des Plaines?
Des Plaines and most northwest suburbs require a plumbing permit for new sump pump installations. MMDS handles all permitting as part of the installation.
Can I install a sump pump myself?
While DIY installation is possible for a basic pump replacement, we strongly recommend professional installation. Improper discharge line routing, incorrect pit sizing, or a missing check valve can cause serious problems — including flooding your neighbor’s yard (which can result in fines).
What size sump pump do I need?
Most Des Plaines and Mount Prospect homes need a 1/3 HP or 1/2 HP submersible pump. Homes with high water tables or frequent flooding may need a 3/4 HP or 1 HP pump. We’ll assess your specific situation during the free estimate.
Does homeowner’s insurance cover sump pump failure?
Standard homeowner’s insurance typically does NOT cover flood damage from sump pump failure. You need a separate sump pump failure endorsement or a flood insurance policy. Another reason why prevention (battery backup) is worth the investment.
Protect Your Des Plaines or Mount Prospect Home Before the Next Storm
Don’t wait until you’re standing in 6 inches of water. MMDS provides expert sump pump installation across Des Plaines, Mount Prospect, Arlington Heights, and the entire northwest suburban area.
Call us today at (847) 221-6280 or schedule your free estimate online. Financing available through Sunbit and PowerPay.