Brentwood, CA · East Contra Costa
Standing Water in Your Yard: Causes and Fixes in Brentwood, CA
Puddles that sit for days, a lawn that squelches, water creeping toward the house. The fix depends on where the water comes from: the roof, the slope, the soil, or a drain that already failed. This page helps you work out which, so you call about the right job.
Cited cost ranges · No obligation
The four usual causes
Roof water with nowhere to go
Downspouts that empty at the foundation or onto a flat lawn. Fix: downspout lines and an outlet.
The yard slopes the wrong way
Settling, landscaping, or added hardscape can tilt the ground toward the house. Fix: regrading, swales, or a channel drain.
Clay soil that soaks in slowly
Water sits because the soil can't take it fast enough. Fix: a subsurface French drain to a real outlet.
Water arriving from uphill
A neighbor's yard or a slope sends water across yours. Fix: an interceptor drain across the slope.
Match the symptom to the fix
| What you see | Usual fix |
|---|---|
| Puddles start right under the downspouts | Underground downspout lines to an outlet. Downspout drainage |
| Water collects against the foundation, and the ground slopes toward the house | Regrading or a swale, plus downspout lines. Regrading and swales |
| Lawn or side yard stays soggy for days after rain | A subsurface French drain to a real outlet. French drain installation |
| Water flows in from uphill or a neighbor's yard | An interceptor (curtain) drain across the slope. Interceptor drains |
| Patio or driveway floods at one low spot or edge | A catch basin or a channel drain. Catch basins and channel drains |
| No place to send the water | A dry well, sized to the soil. Dry wells |
| There's already a drain, and water still sits | Flush and inspect it before replacing. French drain repair |
A quick test you can do after the next rain
- Watch the downspouts. If puddles start right under them, the water is coming off the roof.
- Look at the slope. Stand back and notice whether the ground falls away from the house or toward it. Water at the foundation with a slope toward the house is a grading problem first.
- Time it. Puddles that are gone within a day are usually surface water. Ground that stays soft for several days suggests slow-draining soil or groundwater.
- Check existing drains. If there's already a drain or catch basin and water still sits, it may be clogged. See French drain repair.
- Take photos. Pictures of where the water sits, the downspouts, and the slope make a contractor's first look far more useful.
Regrading and swales
When the ground itself sends water toward the house, the most direct fix is to reshape it so it falls away. Regrading adds or moves soil to create that slope near the foundation. A swale is a shallow, wide channel shaped into the yard to steer surface water around the house to a lower point. HomeGuide (February 2026) lists yard regrading at about $500–$5,000, and Angi's 2026 data puts a swale at about $800–$3,000. Grading near the house has to keep soil and mulch below the weep screed and away from stucco, so ask how the contractor will handle that.
Why it's worth fixing
- Water against the slab and stucco can lead to damp walls, staining, and soil movement in clay.
- Standing water kills lawn and plants and can breed mosquitoes.
- Soggy side yards and patios are slippery and wear out landscaping.
- Problems are easier and cheaper to fix before the rainy season than during it.
For the trade-offs between a French drain and the alternatives, read French drain pros, cons and alternatives. For prices, see the cost guide.
Check any contractor, including one you find here
- Ask for the contractor's CSLB license number and look it up at cslb.ca.gov. The CSLB site also explains when a California contractor license is required.
- Get the quote in writing: the length and depth of each drain, the pipe and gravel, filter fabric, where the outlet is, and how the yard will be restored.
- Be wary of large deposits or cash-only terms. Ask who marks utilities through 811 and who handles any permit the city requires.
- Ask the contractor to show you the route and the fall from the farthest inlet to the outlet, and what warranty covers the work.
This site is an independent referral service, not a contractor. Your request goes to an independent local drainage contractor, who gives the quote and does the work. How this works
Common questions
Who do I call for yard drainage problems?
A drainage contractor or a landscape contractor who does drainage work. Plumbers handle pipes inside the house and sewer lines; yard runoff, French drains, and grading are usually landscape and drainage work. You can request a quote from an independent local drainage contractor through this site.
How do I fix poor drainage in my backyard?
Find the source first. Roof water needs downspout lines; a yard that slopes toward the house needs regrading or a swale; water that soaks the lawn for days needs a subsurface French drain; a flooded patio needs a catch basin or channel drain.
Is standing water in my yard a problem?
Occasional puddles after a big storm that drain within a day are normal. Water that sits for days, collects against the foundation, or keeps coming back is worth fixing before it damages the lawn, the landscaping, or the house.
What are the best drainage options for a backyard?
There's no single best one. The common options are downspout lines, regrading, swales, catch basins, channel drains, French drains, and dry wells, matched to where the water comes from. The table above maps each symptom to its usual fix.
Related drainage fixes
French drain installation
Underground pipe and gravel that collects soggy-yard water and carries it to a real outlet.
Downspouts & catch basins
Underground downspout lines, catch basins and channel drains for roof and patio water.
Dry wells
An underground chamber that lets drain water soak in. Useful as an outlet, limited by clay soil.
Hiring a drainage contractor
A quote checklist, the questions to ask, red flags, and how to check a license.
Talk to a local drainage pro
Ready to stop fighting the water every winter?
Call now or send a 30-second request. You'll be connected with an independent local drainage contractor for a quote.