How to Clear Clogged Downspouts

Downspouts are the unsung heroes of your home's exterior, quietly channeling hundreds of gallons of water away from your foundation during a storm. When they clog, that water has nowhere to go but over the edges of your gutters or, worse, down into your basement or crawlspace. A blocked system can lead to overflowing gutters, water-damaged siding, and significant foundation issues if ignored. Clearing a downspout is a messy but straightforward task that saves you a fortune in professional cleaning fees and potential structural repairs. You want a clear path for water to travel from the roofline to the ground discharge point. Done well, you will see a steady, rapid flow of water exiting the bottom of the pipe without any leaks at the joints or overflow at the gutter intake.

1. Clear the gutter intake. Use a heavy-duty ladder to reach the gutter where the downspout begins. Remove all leaves, shingle grit, and twigs by hand or with a small trowel to prevent further debris from entering the pipe.
2. Locate the blockage. Insert your garden hose into the top of the downspout and turn it on at full pressure. Watch for water backing up at the top, which confirms where the blockage is located.
3. Break up the clog. Feed a plumber's snake or a stiff, plastic drain-cleaning tool down into the pipe. Push and twist the tool to break apart the mass of wet leaves and debris causing the backup.
4. Force debris upward. If the clog persists, move your hose to the bottom of the downspout and feed it upward. Blast water at high pressure to force the debris back up and out of the intake or break it into smaller pieces.
5. Verify complete flow. Once the water flows freely, run the hose at the top of the gutter again for several minutes. Ensure the water exits clearly at the bottom discharge point without leaking from any seams.
6. Tighten all fasteners. Check the fasteners holding the downspout to the wall. Tighten any loose screws to ensure the pipe doesn't vibrate or shift during heavy rain.