A low spot is a dip in the yard where water collects and stays. It can be obvious, like a bowl in the lawn, or so shallow you only notice it when it fills with water.
Low spots are among the most fixable drainage problems, as long as the water has somewhere to go.
What you may be seeing
- A shallow bowl of water after rain
- A ring of dead or different-colored grass
- A dip you can feel when mowing
- Mud or moss in one area
- Water returning to the same spot after every storm
First question: how big and how deep is the low spot?
Use a straight board or string line to see how much lower the spot is. A shallow dip of a few feet is a different job from a low area covering part of the yard.
If the low spot is small and shallow
Often caused by settling and can be leveled.
Possible causes:
- Settled trench or utility line
- Decayed tree stump or roots
- Uneven original grading
If the low area is large
A large low area usually means the yard's overall grade drains toward it.
Possible causes:
- Yard graded toward the area
- No outlet at the lowest point
- Runoff from surrounding hard surfaces
If the low spot is near the house
Low ground near the foundation should be corrected so water flows away from the house.
Possible causes:
- Backfill settling next to the slab
- Landscaping removed
- Downspout erosion
What you can check yourself
Only check these safely and after rain has stopped. Do not dig near marked utilities, and do not go near electrical equipment that is standing in water.
- Mark the outline when it's full of water
- Measure the depth with a board and tape
- Check for an old tree stump or utility trench
- See whether downspouts feed the area
- Look for a downhill direction where water could go
Answer 20 quick questions → to get a preliminary drainage assessment.
What a drainage professional may evaluate
- Laser or transit grade survey
- Locate utilities before any digging
- Identify a legal outlet and pipe route
- Assess soil for compaction
Most common causes
Settling
Soil over trenches, stumps and roots settles over time.
Original grading
The lot was never shaped to drain.
Runoff collection
Surrounding slopes feed the low point.
Erosion
Concentrated water washes soil out and deepens the dip.
Possible solutions
The right fix depends on where the water comes from, where it collects and where it can legally and physically go. These are the solutions most often considered:
Fill and level
Topsoil and re-sodding for small, shallow spots, sloped to drain.
Regrading
Reshape the surrounding area so it sheds water.
Catch basin
An inlet at the low point piped to an outlet when the spot can't be eliminated.
French drain
When the low area also has saturated soil.
When to call a drainage professional
- The spot is larger than a few feet across
- It is near the foundation
- Filling hasn't solved it
- There's no visible place for the water to go
Frequently asked questions
Can I just fill a low spot with dirt?
For small spots, yes. Use a topsoil mix, compact lightly and slope it so water drains away. Large spots usually need regrading or a drain.
Why did a low spot appear in my yard?
Usually from settling over a buried trench, a decayed stump or roots, or erosion from concentrated runoff.
Should I use sand to fill a low spot?
A soil mix that matches the surrounding soil is usually better. Pockets of sand can hold water in clay soils.
Bottom line
Low spots are fixable. Small ones can be filled. Larger ones need regrading or a drain at the low point with a real outlet.
This page is educational and does not replace an onsite evaluation. Conditions, codes and HOA rules vary by property.