Lake County Probes Stormwater Infiltration After Painesville Flooding

Early findings suggest sewer infrastructure not failing, but sump pumps and improper drain connections may be overwhelming the system.

Mar. 16, 2026 at 3:23pm

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Lake County officials are investigating whether stormwater entering sanitary sewer lines contributed to flooding in Painesville Township during a heavy rainstorm last week. While the sewer infrastructure appears relatively new and sound, authorities suspect stormwater infiltration through improper connections like sump pumps and floor drains may be overwhelming the system's capacity.

Why it matters

Stormwater infiltration into sanitary sewers is a common issue that can lead to overflows, backups, and flooding during heavy rain events. Understanding the root causes is crucial for Lake County to address the problem and prevent future flooding in the Painesville area.

The details

County utilities officials say early inspections have not identified structural issues with the 25-year-old sewer system. Instead, they believe stormwater may be entering the sanitary sewer lines through improper connections like sump pumps, flooded walkout basements, and garage floor drains. These can allow large volumes of clean water to overwhelm a system designed only for household wastewater.

  • The county recorded about 2.7 inches of rain during the storm on March 10, 2026.
  • Spring storms often create more runoff than summer rain events due to saturated ground from snowmelt and seasonal moisture.

The players

Randy Rothlisberger

Lake County Utilities Director.

John Plecnik

Lake County Commissioner.

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What they’re saying

“The amount of water that a sump pump can pump is the equivalent of about 40 or 50 homes.”

— Randy Rothlisberger, Utilities Director

“Suddenly your 500-house system is trying to handle a thousand or more.”

— Randy Rothlisberger, Utilities Director

What’s next

The Lake County Utilities Department is examining sanitary sewer capacity in the area, while the county's stormwater district has hired a consultant to evaluate the stormwater drainage system in Painesville Township.

The takeaway

This investigation highlights the complex interplay between stormwater and sanitary sewer systems, and the need for comprehensive infrastructure assessments to address flooding issues. Identifying and addressing improper connections will be crucial for Lake County to mitigate future flooding in the Painesville area.