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TroubleshootingDownspouts & Drainage

Why is water pooling near my foundation?

Usually because roof water is landing at the wall or the ground no longer slopes away. Overflowing gutters, downspouts that empty within a few feet of the house, a clogged buried downspout line, and soil that has settled into a dip along the foundation are the common causes. Water that stays for months, even in dry weather, points to a leak or high groundwater instead.

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By Kasra Taheri, Founder, LoclisPublished

Researched and drafted with AI, then checked claim by claim against the sources listed below before it was published. Prices and rules change; the dates beside each source say when it was last checked.

Step by step

Read when to stop and call a pro, further down this page, before you start.

  1. Step 1: Time how long it lasts

    Note how long the water stays after a storm; a yard that dries out within a day or two is normal.[2]

  2. Step 2: Watch the gutters in the rain

    Look for water spilling over the front of the gutters, and for streaks on the gutters or a washed-out line in the soil below them.[1]

  3. Step 3: Follow each downspout

    Check where every downspout empties; anything that lets water out within 5 feet of the foundation needs an extension.[7]

  4. Step 4: Test buried lines with a hose

    Run a hose into each downspout that goes underground and watch the outlet; no flow, or water bubbling up near the house, means a clog or a break.[11]

  5. Step 5: Check the slope

    Lay a straight board and level out from the wall; the ground should drop about six inches over the first ten feet.[3]

  6. Step 6: Look for hard surfaces tilting in

    Pour a bucket of water on any patio, walk or stoop beside the house and see whether it runs toward the wall or away.

  7. Step 7: Fill small dips by the wall

    Fill a shallow depression in a few-inch layers of clay-rich fill soil, tamping each one, and never use gravel.[4]

  8. Step 8: Check again in dry weather

    If the spot is still wet after days without rain, look for a leaking pipe, sprinkler line or outdoor faucet.[2]

Water pools by a foundation for one of two reasons: too much water is arriving there, or the ground is not carrying it away. Most of the time the extra water is from the roof, through gutters that spill or downspouts that empty right at the wall, and the ground has settled so it no longer slopes away. Both are usually fixable from outside. It is worth doing soon. The Department of Energy's building science program notes that the high volume of water coming off a roof can quickly saturate the soil around a building and wick through the foundation to the interior, leading to mold, rot and indoor air quality problems.[8] The EPA's mold guide puts it plainly: "Make sure the ground slopes away from the building foundation, so that water does not enter or collect around the foundation."[9]

Rainwater pouring from the bottom of a cast-iron downspout onto a concrete splash strip at the base of a brick wall
Photo: oatsy40 from London, CC BY 2.0, via Wikimedia Commons

First, is it really a problem?

Fairfax County's Northern Virginia Soil and Water Conservation District says a yard that dries out within a day or two after a rainstorm is normal.[2] A wetness problem is puddles or soggy areas that last for several days after storms, or never go away.[2] For water at the foundation itself, the district lists the usual causes as gutters that need cleaning or are undersized, downspouts and sump pump pipes, and poor grading around the foundation walls.[5] Work through them in that order.

Gutters that overflow

When a gutter spills, the water drops straight onto the strip of soil next to the wall. Even on a dry day you can spot the evidence: the district points to streaks or watermarks on the outside of the gutters and downspouts, and erosion along the drip line.[1] It says gutters should be cleaned at least once a year, more often with trees close to the house,[1] and that spillover in a normal rain from clean gutters points to an undersized system.[1] See why gutters overflow for the fixes.

Downspouts that empty at the wall

A downspout that ends in a short elbow drops a whole roof section's water in one spot beside the foundation. The Building America Solution Center, run for the U.S. Department of Energy, says downspouts should end at least 5 feet from the foundation, or drain to an underground catchment system at least 10 feet away.[7] When it rains hard, the Fairfax district notes, "an average sized home can experience hundreds of gallons of runoff coming from the roof."[1] An extension is the cheapest fix there is; see how to extend a downspout away from the foundation.

Buried downspout lines that have failed

If your downspouts disappear into the ground and water still pools by the house, suspect the buried line. Leaves and roots can clog them, a mower or a car can crush them, and the outlet at the far end can disappear under grass. Virginia Cooperative Extension advises that you check periodically that an extension pipe is not crushed or clogged and is still carrying water where it should.[10] NDS, which makes the pop-up outlets many lines end in, warns that "a clogged pop-up emitter can potentially back up the entire drainage system".[11] A backed-up line spills out at the top, right beside the foundation.

Also check where the line goes. The Building America guide warns against tying a downspout drain into the perforated foundation drain, which soaks the foundation.[7]

Ground that slopes the wrong way

The ground next to a house should fall away from it. The Fairfax district recommends at least a 5% grade for ten feet around the house, which works out to at least six inches of fall over the first ten feet.[3] A negative grade, tilting toward the house, is the condition to fix.[3]

Grade that was right when the house was built often is not years later. The district explains that soil along a structure that was poorly compacted settles over several years into a depression.[4] To fill a small one, it says to fill in layers with soil that is high in clay and low in sand, tamp each layer thoroughly, and do not use gravel or rock, because water trickles through the gaps and makes a deeper cavity.[4] When you add soil, keep the base of the wall clear: the Building America guide calls for 8 to 16 inches of foundation wall showing between the ground and the first course of siding.[7] Check patios, walks and stoops too. A slab that has tipped toward the wall sends its water there.

Soil that will not drain, or water from somewhere else

Some ground holds water even with the right slope. The district notes that compacted soil, soil with high clay content, or soil with shallow bedrock can leave water perched at or just below the surface.[2]

If the wet spot never dries, rain may not be the cause. The district says long-lasting wetness is "commonly caused by leaks from damaged water pipes or other sources or naturally occurring high groundwater",[2] and that the real source may not be where the wetness shows on the surface.[2] Standing water that lasts has another cost: the Fairfax County Health Department says "Mosquitoes live in standing water for at least a week before they start flying."[12]

Stop and call a pro if

  • Water is coming into the basement or crawlspace, or the foundation is cracking.
  • The fix means regrading more than a dip. Fairfax County's flood program describes regrading as a slope of at least 0.5 inch per foot for at least 10 feet, with the new soil mechanically compacted so it does not settle.[6] It also cites a Fairfax zoning rule that existing contours or drainage channels may not be changed in a way that obstructs or changes the drainage of the land,[6] so in Fairfax ask the county before reshaping a yard, and check your own locality's rules elsewhere.
  • The house is new. In a new development still under bond, the builder may be responsible for fixing drainage problems caused by inadequate grading.[5]
  • A hole along the foundation keeps getting deeper. The district's warning: "Never enter a sinkhole that is deeper than chest height."[4]
  • The ground is wet in dry weather and you suspect a supply-line leak.

To have a line buried, read how much it costs to bury downspouts in Virginia and who installs underground downspout drains. Browse drainage and French drain businesses, exterior pros around Blacksburg or the other exterior answers. When you are ready, describe the drainage problem once and licensed local businesses quote it.

Common questions

How long can water sit by the foundation before it is a problem?
Fairfax County's soil and water district treats a yard that dries out within a day or two after a storm as normal. Puddles or sogginess that last several days, or never go away, are a drainage problem. Water standing for a week can also breed mosquitoes, which the county health department says live in standing water at least that long before flying.
Can I fix pooling by piling dirt against the house?
Filling a dip is the right idea, done with care. The Fairfax district says to use clay-rich fill, not gravel, in compacted layers, and to leave the ground sloping away from the foundation. Do not bury the bottom of the wall: the Building America guide calls for 8 to 16 inches of foundation wall showing between the ground and the first course of siding.
My downspouts are buried. Could they be the problem?
Yes. A buried line that is crushed, clogged with leaves or blocked at its outlet backs water up into the downspout, where it spills out at the house. NDS, which makes pop-up emitters, notes a clogged emitter can back up the whole system. Run a hose into the downspout and see whether water comes out the far end.
Water pools by my foundation even when it has not rained. Why?
Wetness that lasts for months or shows up in dry weather is commonly caused by a leaking water pipe, sprinkler line or outdoor faucet, or by naturally high groundwater, according to the Fairfax district. The leak may not be where the water appears. A plumber or your water utility can help find a leaking supply line.
I just bought a new house and the yard ponds. Who fixes it?
In a new development still under bond, the builder may be responsible for drainage problems caused by inadequate grading, according to the Northern Virginia Soil and Water Conservation District. Contact the builder first, and your county's site inspection or public works office if the subdivision is still under bond.

Sources

  1. [1] Gutters and Downspouts: Wetness or Erosion Problems, Northern Virginia Soil and Water Conservation District, Fairfax County. Checked October 26, 2026.
  2. [2] Wet Yard, Solving Drainage Problems, Northern Virginia Soil and Water Conservation District, Fairfax County. Checked October 26, 2026.
  3. [3] Glossary, Solving Drainage and Erosion Problems, Northern Virginia Soil and Water Conservation District, Fairfax County. Checked October 26, 2026.
  4. [4] Sinkhole, Solving Drainage and Erosion Problems, Northern Virginia Soil and Water Conservation District, Fairfax County. Checked October 26, 2026.
  5. [5] Solving Drainage and Erosion Problems: A Guide for Homeowners, Northern Virginia Soil and Water Conservation District, Fairfax County. Checked October 26, 2026.
  6. [6] Flood Proofing Practices (FMAP Approved List of Practices), Northern Virginia Soil and Water Conservation District, Fairfax County. Checked October 26, 2026.
  7. [7] Gutters and Downspouts, Building America Solution Center, Pacific Northwest National Laboratory, U.S. Department of Energy. Checked October 26, 2026.
  8. [8] Stormwater Gutters Downspouts, Building Science Education, U.S. Department of Energy. Checked October 26, 2026.
  9. [9] A Brief Guide to Mold, Moisture and Your Home, U.S. Environmental Protection Agency. Checked October 26, 2026.
  10. [10] Stormwater Management for Homeowners Fact Sheet 1: Rooftop Redirection (Disconnection), Virginia Cooperative Extension. Checked October 26, 2026.
  11. [11] Pop-Up Drain Emitters, NDS. Checked October 26, 2026.
  12. [12] Get Rid of Standing Water, Fairfax County Health Department. Checked October 26, 2026.

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