Antioch, CA 94509, 94531 · Contra Costa County
Yard Drainage and French Drains in Antioch, CA
Antioch has two kinds of drainage problems. In the hillier southern neighborhoods, water arrives from uphill and brings soil with it. In older, flatter parts of town, it sits, often around drains that were put in decades ago and have stopped working.
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What's different about drainage in Antioch
Water arriving from uphill
Homes on slopes, and below a neighbor's yard, get runoff across the lot. An interceptor drain across the slope, uphill of the house, catches it before it reaches the foundation.
Erosion and washed-out beds
Runoff on a slope carries soil and mulch down onto patios and walkways. Swales, rock-lined channels, and catch basins slow it and steer it away.
Older drains that quit
Yards in the older parts of town may already have drains, sometimes without filter fabric. In clay soil those silt up over the years, and the original problem returns.
Retaining walls that hold water back
Terraced yards rely on drainage behind retaining walls. When that drainage clogs, water seeps through or around the wall. It's worth having checked if a wall weeps or leans.
Hillside lots: catch the water before it arrives
On a slope, the best place to stop water is uphill of what you're protecting. An interceptor (curtain) drain is a French drain dug across the slope that collects water flowing down through the soil and carries it around the house to an outlet. Surface runoff is handled with a swale or a rock-lined channel that steers it around. Details on layouts are on French drain installation.
Older yards: test the drain you already have
If there's an existing drain and the yard still floods, have it flushed and inspected with a camera before replacing anything. Sometimes the outlet is simply buried or a section is crushed. Sometimes the gravel is packed with clay and the trench needs rebuilding. French drain repair explains how a contractor tells the difference.
When the problem is a neighbor's water
Water crossing from a higher lot is common on slopes. An interceptor drain or swale on your side manages it physically. Questions about who's responsible for runoff between properties are legal ones, not drainage ones; this site doesn't give legal advice, so talk to a professional if it comes to that.
Flat yards in older neighborhoods
Closer to the river, many lots are flatter, and the fixes look more like Oakley's: downspout lines, catch basins at low spots, light regrading where the ground has settled toward the house, and a French drain where the lawn stays soggy. The standing water guide maps each symptom to a fix.
Neighborhoods and ZIP codes covered in Antioch
Lots on the hillier southern side of the city tend to deal with runoff from above; Rivertown and the areas closer to the river are older and flatter.
- Deer Valley
- Lone Tree Estates
- Black Diamond Estates
- Mira Vista Hills
- Dallas Ranch
- Prewett Ranch
- Hillcrest
- Rivertown
- and the rest of Antioch
ZIP codes: 94509, 94531. Not sure you're covered? Call (925) 744-8357 and ask.
Decide the system, finish, and installer
French drain installation
Underground pipe and gravel that collects soggy-yard water and carries it to a real outlet.
French drain repair
Signs a drain has clogged or failed, what flushing and repair involve, and when to replace it.
Standing water & soggy yards
Work out what's causing the water, then match it to the right fix.
Yard drainage in Antioch: common questions
How do I stop water running into my yard from the hill above?
Intercept it uphill of the house: an interceptor French drain across the slope for water moving through the soil, and a swale or rock channel for surface runoff, both led to a safe outlet.
My Antioch yard has an old drain. Should I replace it?
Not before testing it. Flushing and a camera inspection often find a buried outlet or one damaged section that can be fixed without replacing the whole line.
Why is my retaining wall wet at the bottom?
Usually because water behind the wall isn't draining. Most retaining walls rely on gravel and a drain pipe behind them; when that clogs, water seeps through. Have it looked at, especially if the wall is leaning.
How much does a French drain cost in Antioch?
National guides put yard French drains at about $10–$50 per foot (HomeGuide 2026, Angi 2026), and hillside or deep drains cost more. A Bay Area contractor's guide quotes $75–$100+ per foot for hillside drains 36 inches or deeper. See the cost guide.
Talk to a local drainage pro
Yard holding water in Antioch?
Call now or send a quick request, and you'll be connected with an independent local drainage contractor for a quote.