Across parts of the U.S. Midwest, periods of intense rainfall combined with melting snow can strain local storm-drain systems—sometimes leading to roadway flooding, slow drainage, and sewage backups. While storm drains are designed to carry stormwater away, the volume and timing of runoff can exceed what pipes, inlets, and pump stations can manage.

Here’s how the mix of heavy rain and snowmelt affects storm drains and why backups happen.

Runoff surges faster than drains can move water

During heavy rain, large amounts of water enter storm drains from streets, rooftops, and compacted ground. When snowmelt is occurring at the same time, meltwater adds another surge. The problem is not only total rainfall or total melt, but also how quickly water reaches the drainage system—often within hours, not days.

Frozen ground and ice can delay absorption

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In the Chicago suburbs, downpours can move faster than stormwater systems were designed to handle. When heavy rainfall hits, sewer and drain lines can become overwhelmed, leading to surcharging (water backing up in pipes), street flooding, and in some cases sanitary sewer backups into basements.

While most residents know that “a lot of rain” is a problem, the mechanism is more specific: stormwater and wastewater flows can exceed pipe capacity, hydraulic pressure can rise, and water can find pathways into homes or low-lying areas—especially when drains and inlets are blocked or when the ground is already saturated.

Why heavy rain strains sewer and drain infrastructure

Many areas in and around Chicago rely on aging underground networks that were built for different rainfall patterns than today’s extremes. During intense storms, the volume of water entering the system can spike quickly, lea ... Read more »

Homeowners across Illinois often notice slow drains, lingering odors, or recurring gurgles—problems that can be made worse by hard water. When water is high in calcium and magnesium, these minerals can build up inside pipes and fixtures, gradually restricting flow and contributing to drain clogs.

What “hard water” means

Hard water forms when groundwater picks up dissolved minerals along its path through soil and rock. In Illinois, the result can be higher mineral content in many residential water supplies. While hard water is generally not a health concern, it is a maintenance issue for plumbing systems.

As water moves through your home, minerals can precipitate—especially when heated, aerated, or exposed to changes in temperature. Over time, precipitation can turn into visible scale on faucets and showerheads and can also accumulate out of sight inside drains and pipe w ... Read more »

Summer is often the busiest season for sewer maintenance teams—not only because demand rises, but because root intrusion becomes more likely. Warmer soil, changing rainfall, and active plant growth combine to draw tree roots toward the water inside sewer pipes, where even minor defects can become entry points.

When temperatures climb, many trees and shrubs increase water uptake. If the surrounding soil dries or becomes uneven, roots will naturally follow moisture gradients. Sewer lines can inadvertently become a reliable moisture source when leaks exist or when joints allow infiltration, concentrating water in places roots can exploit.

Dry spells, then heavy rain

In many regions, summer brings cycles of drought-like conditions followed by storms. During dry periods, roots intensify their search for water. After heavy rain, additional moisture migrates through the ground, increasing soil moisture around se ... Read more »