Drainage in Austin comes down to one job: get storm water away from the slab and out of the beds without sending it onto a neighbor. The fix is usually grading plus a French drain, catch basin, swale or downspout line, matched to your soil and slope. We price per property after a walk. Call (512) 690-4912 or request a free quote.
This page is for homeowners with standing water, soggy turf, washed-out beds or water at the foundation. It covers why Austin yards hold water, which fix suits which problem, what the city expects of you, what drives price, and the steps we follow so the water has somewhere to go before any trench is dug.
Why does my Austin yard flood or hold standing water?
Usually because the ground can’t absorb a hard rain faster than it falls. East of I-35, Blackland clay drains slowly and stays saturated. West of MoPac, thin soil over limestone sheds water downhill fast. Add flat lots, settled grading or a downspout dumping at the slab, and water ends up in the same low spot every storm.
Austin storms arrive in bursts, and a yard that looks fine on a dry weekend can show its weak points in twenty minutes of heavy rain. The causes we see most often are easy to name:
- Slow clay. Blackland clay holds water, then cracks open in a dry August, which lets the next downpour run straight into the cracks beside the foundation.
- Flat or low lots. With no fall across the yard, water has nowhere to go and sits against the house or fence.
- Grade sloping toward the house. Soil settles over the years, and a yard that once shed water outward can slope back in.
- Roof water dumped at the slab. A downspout that ends at the foundation puts a whole roof’s worth of runoff in one place.
- Hard, rocky ground. Compacted or rocky soil sheds water instead of soaking it up, which pushes runoff onto the next lot down.
Our Austin soil guide explains how to tell which soil you have. A quick test is to dig a hole. If it’s deep, dark and sticky when wet, it’s clay. If you hit white rock fast, it’s caliche over limestone, and the fix changes with it.
What are the main drainage solutions for an Austin yard?
The main fixes are regrading, downspout extensions, swales, surface drains and catch basins, French drains and dry creek beds. Regrading and downspout lines come first because they cost least and fix the most. Subsurface pipe is added only when water has to be collected from soil that can’t shed it on the surface.
| Solution | What it does | Where it fits |
|---|---|---|
| Regrading | Reshapes the yard so water flows away from the house | Settled or flat lots, soil sloping toward the slab |
| Downspout extensions | Carries roof water well past the foundation | Any house where gutters end at the wall |
| Swales | Shallow graded channel moving runoff across the lot | Long yards, side yards, slopes |
| Catch basins and surface drains | Grated inlets that collect standing water and pipe it out | Low spots, patios, walk edges |
| French drains | Gravel trench with perforated pipe collecting water below the surface | Soggy lawn areas, water moving toward the house |
| Dry creek beds | Rock channel routing storm runoff, doubles as a landscape feature | Hill Country slopes, concentrated flows |
One rule beats the rest: an inlet alone doesn’t solve anything. A catch basin or French drain needs a pipe route and a place to discharge, and where that outlet lands is the first question we ask on any walk.
Do I need a French drain for a soggy Austin lawn?
Not always. A French drain collects water that has soaked into the ground, so it fits soggy soil and subsurface seepage. If the water is pooling on top because the grade is wrong or a downspout is dumping, regrading or a surface drain is usually cheaper and works better. We confirm which one you have before trenching.
Here’s how we tell. Walk the yard right after a hard rain and again the next morning. Water flowing across the surface points to grading and downspouts. Ground that stays spongy long after the surface dries points to subsurface water, where a French drain helps. Sometimes it’s both, and then the order matters: fix the surface first, then collect what’s left.
Whatever the fix, the outlet must be somewhere legal and safe. Daylighting a pipe to the street, a lower part of your own yard, a dry well or a dry creek bed are common choices. Pointing it at the neighbor’s fence is not.
How does drainage affect my Austin foundation?
Austin’s expansive clay swells when wet and shrinks when dry, and that movement stresses a slab. Water pooling against the foundation, or soil that swings between bone dry and saturated, makes it worse. Good drainage keeps water moving away and soil moisture around the house more even from season to season.
Downspout extensions, regrading away from the slab and a French drain are common protective measures. They’re often far cheaper than repairing a foundation later. We aren’t a foundation contractor and don’t diagnose structural movement. If you see cracks in walls, sticking doors or gaps at window frames, get a structural opinion alongside the drainage walk. The two jobs often go hand in hand, and drainage is the part that keeps the problem from coming back.
Plantings matter too. Shrubs and mulch beds hard against the slab trap water and keep the soil next to the wall wet. A drainage plan often includes pulling beds back from the foundation, using a thinner mulch layer there and shifting thirsty plants away from the wall.
What is different about drainage in the Hill Country versus east Austin?
East and central Austin lots tend to pond because clay holds water on flat ground. West and southwest Austin lots are sloped and rocky, so the trouble is fast runoff and erosion, with water cutting channels, washing out beds and undercutting slopes. The first needs collection and routing, the second needs slowing down.
| Condition | East and central-east Austin | West Austin and Hill Country |
|---|---|---|
| Soil | Deep Blackland clay | Thin caliche over limestone |
| Typical problem | Ponding, soggy lawn, water at the slab | Fast runoff, erosion, washed-out beds |
| Typical fix | Regrading, French drains, catch basins | Swales, dry creek beds, terracing, erosion control |
| Cost driver | Trench length, outlet distance | Digging through rock, slope access |
On rocky ground a trench isn’t a trench. Excavation through caliche is slow, which is why west-side drainage work costs more per foot than a flat clay yard and why surface solutions like swales and dry creek beds are common there. Walls built to hold a slope fall under hardscaping rules, and anything over 4 feet measured from the bottom of the footing needs a building permit.
What does our drainage process look like, step by step?
We start by finding where the water comes from and where it goes, then size the fix to the problem. You approve a written scope before any digging. Most yards move from first walk to finished work in a few weeks, depending on how complex the water path is and whether a permit or utility locate is involved.
- Site walk, ideally after rain. We trace water from the roof, across the grade and to the low spots, and note soil type and slope. You show us where it pools and when. About an hour.
- Check records and rules. We look for drainage easements, floodplain, and utility lines. Texas 811 marks buried lines before any digging. You decide whether to pull your plat or deed records. Several days.
- Plan and outlet. A written scope names each fix, the pipe route and exactly where the water discharges. You decide on options and phasing. Allow a week or two.
- Grade and trench. Regrading and trenching happen first, with spoil placed or hauled away as agreed. A day or two for most residential jobs, longer on rock.
- Install and test. Pipe, gravel, basins or channels go in, then water is run through to confirm flow before covering. You decide on surface finishes.
- Restore and watch a storm. Sod, mulch or rock go back, and we ask you to note how the system behaves in the next heavy rain. A short follow-up fixes anything that didn’t drain as planned.
How much do drainage solutions cost in Austin?
Drainage is priced per property, not per square foot, because trench length, outlet distance, rock and access vary so much. A downspout extension is minor. Regrading, a French drain or a full multi-zone system is a larger project. We quote only after a walk, so treat any figure you see online as a planning range.
We don’t publish a single drainage number because the site decides it. Four things move a bid more than anything else: how far the water has to travel to a legal outlet, whether the trench goes through clay or rock, how much of the yard has to be dug up and restored, and whether a wall, patio or steps are involved. Ask any contractor to name the outlet and the restoration in writing.
Related costs on our own pages stay consistent: design plans run $300 to $2,500, installed mulch runs $55 to $90 per cubic yard, and decomposed granite for paths and dry creek bed edges runs $1 to $3 per square foot. The Austin landscaping cost page carries the rest.
Downspouts deserve a word of their own. A single roof can shed a surprising volume in a storm, and when that water is released at the corner of the house it soaks the one patch of soil the slab depends on. Extending each downspout well past the foundation, onto a graded splash area or into a buried line to a legal outlet, is the cheapest drainage upgrade most Austin houses can make, and it makes every other fix work better.
What does Austin require for drainage work on my lot?
Austin regulates how water leaves a lot. City code bars placing an obstruction in a waterway unless a development application authorizes it, and the person in control of property a waterway crosses must keep it clear. If you have a drainage easement, permanent structures aren’t allowed in it and you shouldn’t plant trees or heavy landscaping there.
The practical points: review your plat and deed for easements before any digging, keep easement areas mowed and free of debris and yard waste, and don’t dump limbs or grass clippings there. Concerns about debris blocking flow can be reported to 3-1-1. For anything that changes how water flows off your lot, or sits near a floodplain, check with Austin Development Services first, since residential grading review varies by site.
Small fill projects of less than two feet of earth fill outside the 100-year floodplain can qualify for streamlined treatment, generally capped around 5,000 square feet of impervious cover and 10,000 square feet of construction area. Our permits guide lists the official City pages we checked.
Can drainage work hurt my oak trees?
It can if it’s done carelessly. Trenching and grade changes near a live oak can cut roots, and oak wilt spreads through fresh wounds. The Texas A&M Forest Service advice we follow is to avoid pruning or wounding oaks from February through June and to seal every wound immediately, any time of year.
That affects timing. If your drainage path runs under an oak canopy, we plan the trench around major roots and schedule the work between July and January when we can. Piling soil or mulch against a trunk is a separate problem to avoid. Our oak care guide explains oak wilt and how to spot it, and our ice storms and drought guide covers storm damage cleanup timing.
What are the warning signs of a drainage problem?
Standing water that lingers hours or days after rain is the clearest sign. Others are spongy turf that never dries, moss or fungus, water pooling at the foundation or in window wells, exposed roots, washed-out mulch on slopes, gutters dumping at the wall, and cracks in hardscape that line up with wet areas.
Catching these before the next storm gives you time to plan the fix in the right season. Late summer and fall are good times to walk a yard and tackle the work, and it’s the stretch when you can see where the previous spring’s storms left their marks in the soil.
What can I do before calling anyone about a drainage problem?
Start with observation. Walk the yard during and after a hard rain, photograph where water pools and which way it runs, and note how long it stays. Clear gutters, run downspouts away from the wall, and pull mulch back from the slab. Those steps cost little and tell you how big the problem really is.
Photos with dates are worth more than memory. They let you show a contractor, a neighbor or a homeowners association exactly what happened and when, and they show whether your fix worked after the next storm. Mark any spot where water enters from a neighbor’s lot or from the street, because that changes who needs to be involved in the solution.
Two things to leave alone. Don’t dump soil, mulch or yard waste into a swale, ditch or easement, because that blocks the flow you’re trying to protect. And don’t pipe water onto a neighbor’s property to get rid of it. The City treats waterway obstructions seriously, and a fix that shifts the problem next door tends to come back as a bigger one.
What time of year is best for drainage work in Austin?
Late summer through fall is a good window. The ground is dry and workable, storms are less frequent than in spring, and sod or beds can be restored in the cooler months when new plantings root well. Avoid working clay when it’s wet, because compacted clay drains even worse afterward.
Spring storms are the other consideration. If a problem is active, there’s no reason to wait, since water against a foundation is a risk any month. But plan oak work around the July through January window, and expect trenching to wait for the soil to dry out after a big rain.
If the project includes new beds or turf, sequence it right: grade and drain first, then plant. Doing it in the other order means tearing out new plants to lay pipe. That is also why a drainage plan and a landscape plan belong in the same conversation.
What does a typical drainage job look like?
Here are three typical scopes built around the conditions above. They’re illustrations of how the work is organized for a given kind of Austin yard, not jobs we’ve finished, and your own scope is written only after we’ve walked the property and traced where the water comes from.
A typical flat east-side yard with water at the slab
Blackland clay, gutters ending at the wall and grade settled toward the house. The scope is downspout extensions to a safe outlet, regrading a few feet out from the foundation, and a short French drain or surface drain where one low spot collects water. Beds are pulled back from the slab.
A typical west-side slope with erosion
A rocky, sloped lot where runoff cuts a gully through the beds. The scope is a swale or dry creek bed to carry the flow, rock armoring at the steepest spot, and small terraces or a wall where the grade drops. Digging through caliche pushes this scope toward the higher end.
A typical backyard that stays soggy
A flat back lawn that stays spongy for days. The scope is a French drain with pipe routed to a legal outlet, plus a catch basin at the lowest point. The sod comes up, the trench goes in, and the lawn is restored over it.
Which Austin suburbs do you serve for drainage work?
We serve Austin and nearby Travis, Williamson and Hays County communities. Round Rock and Pflugerville sit mostly on Blackland clay, while Lakeway and Bee Cave bring slope and limestone. The approach follows the soil and slope, not the city line.
See the areas we serve page for the full list. If you’d like to plan a drainage fix alongside new beds or paths, our landscape design service can fold the water plan into the drawing so nothing is dug twice. When you’re ready, request a free quote or call (512) 690-4912.