Yard Stays Wet for Days

What you may be seeing

• Squishy ground days after rain
• Footprints that fill with water
• Thinning or yellow grass and moss
• Mud in high-traffic areas
• Mosquitoes and gnats
• Trees or shrubs declining in the wet area

First question: is it wet even when it hasn't rained?

If the area stays wet in dry weather, look for a leak first: an irrigation line, a valve, a pool line or a water service line. If it's only wet after rain, it's a drainage problem.

If it's only wet after rain

The soil can't drain the water fast enough and there's no surface or subsurface outlet.

Possible causes:

• Heavy clay or compacted soil
• Flat yard with no outlet
• Runoff from roofs and neighbors adding water

If it's wet even in dry weather

Constant moisture without rain usually means a water source other than rain.

Possible causes:

• Irrigation leak or stuck valve
• Pool or water line leak
• Natural seep or high water table

If the wet area is getting bigger

Growth over time suggests a worsening leak, a failing drain or settling ground.

Possible causes:

• Failing underground drain
• Settling soil
• A new source such as a neighbor's construction

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.

• Check the irrigation controller schedule and look for zones running too long
• With all water off, watch the water meter for movement (possible leak)
• Probe the soil with a screwdriver to see how deep the saturation goes
• Map where downspouts and neighboring runoff enter
• Note whether the area dries in summer

Answer 20 quick questions → to get a preliminary drainage assessment.

What a drainage professional may evaluate

• Soil and infiltration testing
• Grade survey
• Leak isolation of irrigation and water lines
• Camera or flow testing of existing drains
• Groundwater observation with a test hole

Most common causes

Clay or compacted soil

Water moves slowly through heavy soil, so it stays saturated.

Flat lot with no outlet

Without slope or a drain, water can only leave by soaking in or evaporating.

Excess runoff

Roof and neighbor water keeps the soil charged after each rain.

Irrigation or water leak

A leak can keep an area wet that looks like a drainage problem.

High water table

In some areas groundwater sits close to the surface after wet periods.

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:

French drain

Collects water from saturated soil and carries it to an outlet. The most common fix for soggy yards.

Regrading with an outlet

Shapes the yard to shed water.

Downspout drainage

Reduces how much water reaches the area.

Leak repair

Fixes irrigation or water line leaks if they are the source.

Soil amendment and aeration

Helps marginal areas, usually combined with other fixes.

When to call a drainage professional

• The area is wet more than three days after rain
• It's wet in dry weather (possible leak)
• It's near the foundation
• Trees or structures are affected

Bottom line

A yard that stays wet for days is a saturated-soil problem. Rule out leaks, reduce incoming runoff and give the water a subsurface path out.