How to Clear a Clogged Downspout in 4 Steps (Save $150+)

TL;DR: A clogged downspout backs water into gutters, overflows onto siding and foundations, and costs $150-$300 to clear professionally. You can usually fix it yourself in 30-60 minutes with a garden hose, plumber's snake, or shop-vac. Check the top opening first, then the bottom elbow—most clogs live in those two spots.

_Last reviewed: July 2026 · 5 min read_

When water pours over your gutter edge during a storm instead of draining through the downspout, you've got a clog. Left alone, that overflow erodes soil around the foundation, seeps into basements, and rots fascia boards. The fix is straightforward if you catch it before the next rain.

Okoniq Property Hub logs gutter cleanings, downspout repairs, and the date you last flushed each corner—helpful when you're deciding whether to clear it yourself or call someone.

What causes a downspout to clog in the first place?

Leaves, shingle grit, seed pods, and twigs wash into gutters, then funnel into the downspout opening. The elbow at the bottom—where the pipe turns horizontal to carry water away from the house—acts as a catch basin. Over time, organic matter packs into a solid plug, especially in homes near oaks, maples, or pine trees.

If you've skipped gutter cleaning for more than a year, expect a clog. Homes without gutter guards or proper attic ventilation also shed more debris. A single heavy storm can flush enough material into the downspout to block it completely.

Ice dams in winter can push slush and frozen leaves into the pipe, creating a plug that doesn't clear until spring thaw. By then, water may have already damaged the soffit or seeped behind the siding.

How do you know which downspout is clogged?

Run water from a garden hose into each gutter section for 30 seconds. Watch the downspout outlet at ground level. If water trickles or doesn't appear at all, that downspout is blocked. If water overflows the gutter edge before reaching the downspout opening, the clog is at the top of the pipe or in the gutter itself.

Mark the problem downspout with a piece of tape so you remember which one to work on. If multiple downspouts are sluggish, prioritize corners closest to the foundation or basement windows—those cause the most expensive water damage.

Check for standing water in the gutter after a rainstorm. Pools that don't drain within an hour point to a clog downstream. Some older homes have underground drainpipes that carry water 10-20 feet from the foundation; if the buried section is clogged, water backs up into the visible downspout and gutter.

What tools and steps clear a clogged downspout fast?

Start at the top. Remove the strainer or leaf guard over the downspout opening. Use a garden trowel or gloved hand to scoop out any visible debris. Shine a flashlight down the pipe—if you see a blockage within arm's reach, pull it out.

Next, insert a garden hose into the top opening and turn the water on full blast for 60 seconds. If the clog is soft (wet leaves, pine needles), the pressure will push it through. Watch the bottom outlet; if water flows freely, you're done. If it trickles or backs up, the plug is stubborn.

For a hard clog, feed a plumber's snake or drain auger down from the top. A 15-foot snake costs $20-$40 at any hardware store. Crank the handle as you push—metal coils bite into packed debris and break it apart. Pull the snake out every few feet to clear the tip. Once you feel less resistance, flush again with the hose.

If the clog is in the bottom elbow, disconnect the elbow from the downspout (most are held by two screws or pop rivets). Tap the elbow on the ground to knock out the plug, or blast it with the hose from the back side. Reattach the elbow and test the full downspout with water from the top. Similar to clearing an AC condensate drain line, a shop-vac applied to the bottom opening can suck out wet debris when a hose won't push it through.

When should you call a professional instead of doing it yourself?

If your home is two or three stories and you're not comfortable on an extension ladder, hire a gutter service. Falls from ladders cause 500,000 injuries per year in the US; a $150 service call is cheaper than an ER visit. Most gutter pros charge $100-$300 to clean all gutters and clear downspouts on a standard single-family home.

If the downspout is crushed, rusted through, or pulling away from the wall, you'll need replacement sections. Aluminum downspout costs $3-$8 per linear foot at home centers. A handyman can swap it in an hour. If water still won't drain after you've cleared visible clogs, the underground drainpipe may be collapsed or root-bound—call a plumber with a camera scope.

Homes with chronic clogs benefit from gutter guards (mesh screens or solid covers that block debris). Expect to pay $1,500-$3,000 for a full-perimeter install on a 2,000 sq ft ranch. The payback is fewer ladder trips and less foundation water damage risk.

How often should you check and clean downspouts?

Inspect gutters and downspouts twice a year—once in late spring after tree pollen and seed drop, once in late fall after leaves. Homes surrounded by mature trees need quarterly checks. Run a hose test each time: 30 seconds of water in each gutter section, watch for free flow at the bottom.

Log the date in your maintenance tracker. If a downspout clogs within three months of the last cleaning, you either have a low-slope gutter that holds water (pitch should be ¼ inch per 10 feet toward the downspout) or a sharp elbow that catches debris. Consider adding a second downspout to that gutter run or replacing the elbow with a gentler sweep bend.

Spring storms dump the most debris. After a heavy rain with wind, do a quick walk-around. Look for water stains on siding below the gutter line or fresh erosion trenches near the foundation—both signal a new clog. Catching it early keeps repair costs under $50 and prevents the $2,000-$5,000 bills that come with basement flooding or rotted fascia boards.

FAQ

How much does it cost to have a professional clear a clogged downspout?

Gutter cleaning services charge $100-$300 for a full-perimeter cleanout on a typical single-family home, including downspout flushing. If you only need one downspout cleared and the gutters are otherwise clean, some pros will do a service call for $75-$125. Prices rise for two-story homes or if the crew needs to remove and reinstall gutter guards.

Can I use a pressure washer to clear a downspout clog?

Yes, but aim the nozzle away from seams and use a 25- or 40-degree tip, not the zero-degree jet. Pressure washers deliver 1,500-3,000 PSI—enough to split aluminum downspout seams or blow apart old gutter joints. A standard garden hose at 40-60 PSI clears most clogs without damage. Save the pressure washer for scrubbing the outside of the downspout or the driveway afterward.

What if water still overflows after I cleared the downspout?

Check the gutter slope with a 4-foot level. Gutters should drop ¼ inch per 10 feet toward the downspout. If they're level or back-pitched, water pools and overflows even with a clear downspout. Adjust the gutter hangers to restore pitch. Also verify the downspout opening isn't smaller than the gutter outlet—some homes have a 2×3-inch gutter feeding into a crimped 2×2-inch downspout top, creating a bottleneck.

How do I prevent downspouts from clogging again?

Install gutter guards or mesh screens over the gutter runs—foam inserts cost $2-$4 per foot and block most leaves. Add a downspout strainer (a wire basket that sits in the outlet) for $5-$10 per downspout. Trim tree branches that overhang the roof by at least 6 feet. Schedule gutter cleaning twice a year, and flush each downspout with a hose after cleaning to confirm flow.

Is a clogged downspout covered by homeowners insurance?

Standard homeowners policies exclude damage caused by poor maintenance. If a clogged downspout leads to foundation cracks, basement flooding, or mold, the insurer will likely deny the claim because regular gutter cleaning is considered the owner's responsibility. Insurance may cover sudden water damage from a different cause—like a tree branch puncturing the gutter during a storm—but not the gradual rot or erosion from a neglected clog.

This is educational information, not construction or plumbing advice. Consult a licensed contractor if your downspout is damaged, pulling away from the wall, or if you're uncomfortable working on a ladder above the first story.