May in Minnesota is when sump pumps face their toughest test of the entire year. Snowmelt may be slowing down, but spring rains are just getting started—and with the ground already fully saturated, water has nowhere to go except straight toward your foundation. At Bisbee Plumbing & Heating, we see more sump pump failures, flooded basements, and emergency calls in May than almost any other month.

The good news? A little preventative maintenance now can save you from major water damage later.

Why Sump Pumps Work the Hardest in May

By the time May arrives, your yard, soil, and drainage system are dealing with maximum water volume. Here’s why:

• Snowmelt is still seeping into the ground, adding pressure to basements and drain tiles.
• Spring rains increase and become the dominant source of moisture.
• The soil is already waterlogged, meaning it can’t absorb more water.
• Groundwater rises and pushes moisture toward your home’s foundation.

All of this creates peak demand on your sump pump—often more than the system has handled in the past six months combined.

Why Sump Pumps Fail During Spring Rains

Most sump pump failures aren’t random—they happen because May pushes systems past their limits. Here are the most common issues:

1. Pumps Running Constantly

If your pump cycles nonstop, it may be:

• Too small for current water volume
• Struggling with a stuck float
• Blocked by debris

Constant running is a major red flag in May.

2. Power Outages During Storms

Heavy Minnesota thunderstorms frequently knock out power—and without electricity, your sump pump stops instantly. If you don’t have a battery backup, flooding can begin within minutes.

3. Aging or Underperforming Pumps

Most pumps last 7–10 years. Older systems simply can’t keep up with May water loads.

4. Clogged Discharge Lines

Frozen or debris-filled discharge lines prevent water from leaving the home. This causes the pump to overheat and fail—or pushes water right back into the basement.

5. Overwhelmed Drainage Systems

When gutters, downspouts, or exterior drains are clogged, more water flows toward the foundation instead of away from it—forcing the sump pump to work harder.

Warning Signs Your Sump Pump Isn't Ready

If you notice any of the following, your system needs immediate attention:

• Excessive vibration or loud noises
• A sump pump running constantly
• Slow or inconsistent cycling
• Moldy or damp smells in the basement
• Visible water pooling around the pump

What Homeowners Should Check Right Now

Before the next heavy rainfall, take a few minutes to check these critical items:

1. Test the Pump

Pour water into the pit until the float rises. The pump should turn on immediately and drain efficiently.

2. Inspect the Power Source

Make sure the pump is plugged into a working GFCI outlet and that the cord is in good shape.

3. Check the Discharge Line

Look for blockages, kinks, ice remnants, or debris around the exterior discharge point.

4. Clean the Pit

Silt, dirt, and sediment can clog the pump or interfere with the float switch.

5. Add a Battery Backup System

This is one of the most important steps. When the power goes out during storms—as it often does in Minnesota—a battery backup keeps the pump running and prevents flooding.

6. Consider Installing a Secondary Sump Pump

Adding a second pump provides extra protection when water levels spike or your primary pump fails.

Stay Ahead of Flooding Before the Heavy Rains Arrive

May is the month when sump pumps either rise to the task—or fail under pressure. A quick inspection now can prevent costly basement flooding, mold growth, and structural damage.

At Bisbee Plumbing & Heating, we’ve helped Minnesota homeowners stay dry for more than 50 years. Whether you need sump pump repair, replacement, battery backup installation, or a full inspection, our licensed team is ready to help.

Want to make sure your sump pump is ready for Minnesota’s spring rains?
Call (507) 537-0596 or schedule service at bisbeeph.com before the storms hit.