How often should you clear downspouts?
Updated July 2026
Flush your downspouts twice a year, in spring and fall, at the same time you clean the gutters, and make sure the water exits 4 to 6 feet from the foundation. A gutter can be spotless and still fail if the downspout below it is packed with leaves and shingle grit, because there is nowhere for the water to go. The downspout is the drain, and a blocked drain backs up and dumps a roof's worth of rain right against the house at the worst possible spot.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Standard downspouts, spring and fall | Twice a year | The routine flush that clears the season's debris before it packs down |
| Underground / buried drain lines | Snake every 1–2 years | Roots and silt clog buried pipe, and you cannot see it back up |
| Elbows and long horizontal runs | Check each flush | Debris jams at every bend, which is where clogs usually form |
| No extensions at the outlet | Add them now | Water dumped at the base of the wall is the root of most wet basements |
The cost of skipping it
What ignoring them costs: a blocked downspout overflows at the top or, worse, discharges straight down at the foundation. Season after season, that concentrated water saturates the soil against the footing, seeps into the basement, and in clay soils heaves and cracks the foundation. Basement water problems and foundation repairs run from $1,000 into the tens of thousands, and a single failed downspout can be the whole cause. Compare that to a $10 splash block or a $15 flexible extension that carries the water safely out to the yard.
How to do it (30–45 minutes · DIY with a hose)
- After clearing the gutters, tap along each downspout; a dull, solid sound marks where debris is packed.
- Run a hose full blast down from the top and confirm a strong stream exits at the bottom.
- For a stubborn clog, feed the hose up from the bottom, or work a plumber's snake down from the top to break it loose.
- Detach the bottom elbow to clear a jam at the turn if flushing does not do it.
- Attach or reposition extensions so discharge lands 4–6 feet out and the ground slopes away from the house.
- For buried drain lines, run water and watch for slow drainage or backup, and snake or call a pro if it pools.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing downspout clearing schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
How do I know a downspout is clogged?
The clearest sign is water pouring over the gutter directly above the downspout during rain while the rest of the run drains fine, which means the outlet is blocked. Others: little or no water coming out the bottom in a downpour, a downspout that sounds solid instead of hollow when you tap it, and sagging or bulging seams from trapped debris and ice. In winter, ice creeping up from the base is a giveaway. Any of these means flush it now rather than waiting for the next scheduled clean.
How far should downspouts discharge from the house?
Get the water at least 4 to 6 feet away from the foundation, farther if the ground slopes back toward the house. Right at the wall, downspout water is the single biggest driver of wet basements and foundation movement. Cheap fixes do it: a splash block redirects the flow, a flexible or roll-out extension carries it further, and the soil should slope away from the house for the first several feet. Underground drain pipe to a distant outlet is the tidiest option where the yard allows.
Do buried downspout drain lines need maintenance too?
Yes, and they are easy to forget because you cannot see them back up. Buried lines silt in and catch tree roots over time, and a blocked one sends water right back to the foundation invisibly. Every year or two, run a hose into the inlet and watch that it drains freely at the outlet with no pooling at the top. If it backs up, a drain snake or a pro with a camera and jetter can clear it. A blocked buried line quietly recreates the very problem the pipe was installed to solve.
Are splash blocks or extensions better?
Both help; extensions help more. A splash block just redirects and slows water at the base, which is better than nothing but often still too close to the wall. A downspout extension (flexible, roll-out, or rigid) actually carries the water the 4–6 feet you want, and buried pipe carries it further still. In poor-drainage or clay-soil yards, spend on the extension. Whatever you use, the goal is the same: move the concentrated roof runoff away from the footing, not just off the concrete.