Wet spot or soggy patch in the yard: Causes and Fixes

Ty Malagarie

Wet Spot in the Yard That Won't Dry Up? That's Usually the Service Line, Not the Slab

Why is one spot in my yard always wet?

What to do right now

Check whether the wet spot lines up with the path between your water meter and the house, or between the house and the street sewer connection.
Smell the area. A sewage odor points at the sewer lateral rather than the fresh water service line.
Run the household water meter test with everything off, to see whether you are actively losing water rather than just seeing normal groundwater.
Look for mature trees nearby. Root intrusion into an aging line is one of the most common causes of exactly this symptom in this region.
Avoid parking or running heavy equipment over the soft area until it has been looked at.

A soggy patch of yard, or a strip of grass that stays greener and wetter than everywhere around it without an obvious drainage reason, is almost always a leak on the service line, the water or sewer pipe running between the street and your house, not a leak under your foundation. A slab leak shows up inside the house, as a warm floor or a climbing water bill. A yard leak shows up outside, as standing water, unusually soft ground, a sewage smell, or grass growth that outpaces the rest of the lawn. In Southeast Texas's clay soil and high water table the two get confused because both raise your bill, but the fix is completely different: digging or trenching in the yard, not opening the slab.

Wet spot or soggy patch in the yard

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Why this happens in Southeast Texas

Between Jefferson, Orange, Hardin, Liberty, and Chambers counties, the combination of clay soil and a high water table means yard drainage is already marginal most of the year, which is exactly why a real leak can hide in plain sight as just another damp corner of the lawn. TCEQ regulates the water quality side of a compromised service line too, since a break in the supply line can let contaminants into the system if pressure drops enough for backflow, which is part of why a suspected water line leak in the yard is worth taking seriously rather than waiting out. Older neighborhoods across the region also carry more mature trees than newer subdivisions, and those root systems are patient. A sewer lateral that ran fine for decades can start leaking the year a root finally works its way into an old joint.

How a Yard Leak Is Different From a Slab Leak

A slab leak involves a line under the concrete footprint of the house, and it announces itself indoors, through a warm floor, a rising water bill, or the sound of running water inside the walls. A yard leak involves the service line instead, the water supply pipe running from the meter to the house, or the sewer lateral running from the house to the city's sewer main under the street. Because that pipe sits in open ground rather than under a slab, the symptoms show up outside instead: standing water with no recent rain, soil that stays soft and springy underfoot, or a section of lawn that is noticeably greener than the rest because it is getting extra water or nutrients it should not be.

Water Line vs. Sewer Line: The Smell Test and the Grass Test

The fastest way to sort the two apart yourself is your nose. A sewage smell, even a faint one, points at the sewer lateral rather than the fresh water line. Along with the smell, a sewer leak often draws flies, produces darker or sunken soil rather than just wet soil, and sometimes causes a slow drain or gurgle inside the house at the same time. An odorless wet spot, especially one with grass growing unusually lush and green right over it, points more toward the fresh water service line. Treated water leaking into soil acts almost like fertilizer for the grass sitting on top of it, so that one strip of lawn often looks better than everything around it.

Root Intrusion and a High Water Table Make This Common Here

Mature trees are common throughout older Golden Triangle neighborhoods, and tree roots are drawn to the moisture and nutrients inside a sewer lateral, especially an aging cast iron or clay line. Once roots get into a joint, they widen it over time, and eventually the line cracks or separates enough to leak. The region's naturally high water table, already saturating clay soil across Jefferson, Orange, Hardin, Liberty, and Chambers counties for much of the year, makes this harder to spot on your own, because the ground is often damp anyway. So the meter test and the smell test carry more weight here than they would in a drier climate, because ordinary ground moisture can hide a real leak for a long time. Flooding events like Hurricane Harvey and Tropical Storm Imelda saturated soil across the whole region and shifted plenty of older lines that had been fine for decades.

Why This One Usually Doesn't Require Breaking Concrete

Because a service line sits outside the footprint of the house, fixing it almost never involves the slab at all. Depending on the depth, material, and age of the line, the repair is typically either a traditional trench dug along the pipe's path, or a trenchless method that pulls new pipe through the old one with a much smaller access point. Which approach makes sense depends on real factors, the pipe's material and age, how deep it runs, and whether tree roots have already compromised multiple sections, not something anyone should promise a number on sight unseen. What matters most for you right now is knowing this repair generally stays in the yard, not in your living room floor.

Nearby Areas We Serve

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Frequently Asked Questions

Could this just be a low spot where rainwater collects?

It is worth ruling out first, especially after heavy rain. The difference is timing: a drainage low spot dries out within a day or two once the rain stops, while a leak-fed wet spot stays wet regardless of the weather. If it is still soggy a week after the last rain, drainage is an unlikely explanation on its own.

Does a sewer line leak mean raw sewage is getting into my yard?

It can, depending on where the break is and how much flow is going through the line when it happens. That is exactly why a sewage smell in the yard is treated as a same-day issue rather than something to schedule around, since it is both a plumbing problem and a health concern.

Will fixing this tear up my whole lawn?

Usually not. Depending on the pipe's depth, material, and how many sections are affected, a trenchless repair can address the line through a much smaller access point than a full trench. Even a traditional trench repair is typically limited to the path of the pipe rather than the whole yard.

Is a leak near the street my responsibility or the city's?

In general, the property owner is responsible for the service line from the meter to the house, while the city maintains the main line under the street. Where exactly that line falls, and who owns which section, is worth confirming, since it affects who handles the repair.

Ty Malagarie, Owner

N-Sink Plumbing and Drain Specialist · Est. 2026

Licensed PlumberFully Insured

Updated October 2026