"What are the downsides of a French drain?" and "What can I do instead?" come up on almost every French drain search around Brentwood, and contractor websites tend to skip them. Here's the straight version.
The short version
| Pros | Cons |
|---|---|
| Removes water moving through the soil, not just surface puddles | Does nothing for roof water or a yard that slopes toward the house |
| Mostly invisible once the lawn grows back | Digs up the yard; restoration can be a real cost |
| Works on flat lots and slopes when there's a real outlet | Fails if there's no outlet, or the outlet gets buried |
| Lasts a long time when built with fabric and steady slope | Silts up in clay soil when fabric is skipped |
| Can feed a dry well or a curb outlet | One of the pricier drainage fixes per foot |
The real downsides
It's the wrong tool for some problems
A French drain collects water from the soil around it. If the water is pouring off the roof, flowing across a patio, or running toward the house because the ground slopes that way, a French drain is an expensive partial fix. Those problems are better solved at the source.
It clogs if it's built cheaply
Fine soil washes into the gravel and pipe over time. In clay soil, like much of East County, that happens faster. Filter fabric around the gravel, washed (not dirty) gravel, and a cleanout for flushing are what keep a drain working. Without them, a drain can lose most of its capacity within a few seasons. If yours already has, see French drain repair.
Everything depends on the outlet
Water collected underground has to go somewhere lower. On a flat lot that may mean a long run to the street, a pump, or a dry well, each with its own cost and limits. Rules on curb outlets and storm-drain connections vary by city, so confirm before the work starts.
It's disruptive and not cheap
A trench through the lawn, piles of soil, and sometimes cut concrete. National guides put yard French drains at roughly $10–$50 per foot (HomeGuide 2026, Angi 2026), and Bay Area jobs run higher. See the cost guide.
Alternatives to a French drain
| Alternative | Best for | Typical cost |
|---|---|---|
| Downspout lines to an outlet | Water that comes off the roof | Depends on length and outlet |
| Regrading near the house | Ground that slopes toward the foundation | $500–$5,000 (HomeGuide 2026) |
| Swale | Steering surface water around the house | $800–$3,000 (Angi 2026) |
| Catch basin | Water pooling at one low spot | $600–$2,000 (Angi 2026) |
| Channel (trench) drain | Driveways and patios shedding water toward the house | $30–$70 per ft (Angi 2026) |
| Dry well | An outlet when there's nowhere to daylight water | $1,000–$4,000 (Angi 2026) |
| Dry creek bed | Visible, decorative surface channel on a slope | Varies widely with size and rock |
Many yards need a combination: downspout lines for the roof, a little regrading at the foundation, and a French drain only where the soil stays saturated. The standing water guide maps each symptom to its usual fix.
When a French drain is worth it
- The lawn or side yard stays soggy for days after rain, not just puddled for hours.
- Water is arriving from uphill or from a neighbor's yard.
- There's a realistic outlet: lower ground, a permitted curb outlet, or soil that can take a dry well.
- Downspouts and grading are already handled, and the problem remains.
Frequently asked questions
What are the downsides of a French drain?
It doesn't fix roof water or a yard sloping toward the house, it disrupts the yard to install, it can clog in clay soil without filter fabric, and it only works with a reliable outlet.
What can I do instead of a French drain?
Depending on the problem: downspout lines, regrading, a swale, a catch basin, a channel drain, or a dry well. Many yards need a mix rather than one big fix.
Do French drains really work?
Yes, when they're placed where water moves through the soil, built with fabric and steady slope, and connected to a working outlet. Most disappointments trace back to one of those three.
Is a French drain better than a swale?
They solve different problems. A swale moves surface water you can see; a French drain removes water moving through the soil. A swale is usually cheaper and easier to maintain where it fits.
Cost ranges and technical notes on this page are general information from the sources named, not a quote or professional advice. Prices vary by yard, soil and drain design; get a written quote for your property. See the disclaimer and cost sources.