Professional Drainage Contractors in San Jose, CA
Most San Jose yards need drainage work because of soil, not rainfall. Santa Clara County sits on expansive clay that swells when wet and refuses to absorb the next storm, so water pools on the surface and pushes against your foundation. JPM Landscape has fixed that here since 1984, with 40+ years of building in this soil (CA License #963784). Typical residential drainage projects run $5,000 to $15,000 installed; French drains are $25 to $50 per linear foot and downspout fixes start near $300 (verified August 2026). Every project starts with a free on-site assessment of where the water is coming from.
Standing Water Is a Soil Problem in San Jose, Not a Rain Problem
You know the symptoms: a puddle in the same low spot after every rain, grass still spongy after three days of sun, a dark moisture line along the stucco.
Those come from two different problems. Surface water runs across the yard and collects in low spots, which is a grading problem. Subsurface water saturates the soil and stays trapped, which is a groundwater problem. Most Bay Area properties have both, and that is why single-product fixes fail so often. Our guide on how to fix a flooded yard covers what to watch for during the storm rather than after it.
Clay is what makes it worse here. Water moves through Santa Clara County clay slowly, so it sits against footings instead of percolating away, creating hydrostatic pressure, the force that cracks slabs, tilts walls and floods crawl spaces. Left alone for a few winters it stops being a landscape issue and starts threatening the structure, which is why proper drainage protects your foundation as much as your lawn.
Overwatering compounds it. We often find the complaint is really a stuck valve or a controller still on a summer schedule, so we check whether your irrigation system is part of the problem before trenching.
When San Jose Requires a Permit for Drainage Work
Most residential drainage work in San Jose needs no permit. One is required for a retaining wall over three feet, work that changes drainage onto a neighbor’s property, or a tie-in to the municipal storm drain. California’s MWELO ordinance also applies once a renovation passes 2,500 square feet. We flag permits in the proposal and call 811 before excavation.
Our Drainage San Jose Services Include:
- Drainage Installation
- Drainage Repair
- Yard Drainage
- Landscape Drainage
- Surface Drainage
- French Drains
- Trench Drains
- Channel Drains
- Area Drains
- Downspout Drainage
- Storm Drainage
- Ground Drainage
- Soil Drainage
- Water Runoff Control
- Flood Prevention
Drainage System Installation & Repair in San Jose, Silicon Valley & the South Bay
JPM Landscape proudly serves homeowners in San Jose and throughout Silicon Valley, the South Bay, and greater Bay Area communities. Our expert landscape drainage in San Jose and lawn drainage in Bay Areas solutions are designed to handle local soil and climate conditions, keeping your property safe from flooding, standing water, and erosion year-round while maintaining a healthy, vibrant landscape.
Which Drainage System Your Yard Actually Needs
Choose by where the water comes from, not by price.
| System | Solves | Best for | Typical cost |
|---|---|---|---|
|
Catch basin |
Surface water |
Low spots, driveways, downspouts |
800–$1,500 each |
|
French drain |
Subsurface water |
Soggy soil, foundation, uphill flow |
$25–$50 per ft |
|
Dry well |
Runoff, no outlet |
Flat lots, retention |
$1,500–$3,000 |
|
Regrading / swale |
Both, at the source |
Negative slope, sheet flow |
$15–$30 per ft |
If water runs across the surface during the storm, you need collection. If the surface looks fine but the ground stays soggy for days afterward, you need a French drain. If both happen you need both, and a catch basin tied into a French drain line is the most common system we install here. Every system needs an outfall, so we find the discharge point first.
Catch Basins and Surface Water Collection
Catch basins, area drains, channel drains and trench drains capture water where it collects and carry it underground to a safe outlet: a lawn’s low point, the foot of a driveway, a patio edge, a downspout.
French Drains, Curtain Drains and Dry Wells
A French drain is a gravel-filled trench holding a perforated pipe wrapped in filter fabric, intercepting water moving through the soil and carrying it away by gravity. Perimeter drains protect the house, curtain drains cut off water flowing downhill from an uphill neighbor, and dry wells hold runoff where no gravity outlet exists.
Regrading, Swales and Hardscape Drainage
Sometimes the fix is shaping ground, not burying pipe. Regrading restores positive slope away from the house, and a vegetated swale carries runoff across the property. Drainage behind retaining and seat wall construction is never optional, because trapped water is why walls fail early.
Why Existing Drainage Systems Stop Working
Systems fail predictably: crushed pipe, root intrusion, silted gravel, disconnected downspouts, or an outlet buried by a later project. We camera-inspect and jet existing lines before recommending replacement, because a blocked outlet looks exactly like a failed system. Our post on common drainage problems in Bay Area yards covers the rest.
What Drainage Costs in San Jose and How We Build It
Installed ranges for San Jose and South Bay homes, verified August 2026. Price depends on footage, depth, access and restoration. For scale, NerdWallet puts major foundation repair at $15,000 to $100,000 or more.
| Work | Installed range |
|---|---|
|
French drain, standard |
$25–$50 per linear foot |
|
Catch basin, single with piping |
$800–$1,500 |
|
Downspout extension |
$300–$600 each |
|
Regrading |
$3,000–$7,000, to $15,000+ extensive |
|
Complete drainage system |
$5,000–$15,000 typical |
Six Steps From First Visit to Final Testing
- Free assessment. We find the low points, check downspouts and grade, and identify a viable outfall, ideally during or just after rain.
- Written proposal. System type, materials, footage, price and any permit requirement.
- Utility locate. 811 marks first, then trench lines staked and slope confirmed.
- Installation. Most residential systems take two to five working days; larger regrading, one to two weeks.
- Restoration. Sod, planting or hardscape repaired so the yard looks finished, not excavated.
- Testing. We run water through the system with you there and explain maintenance.
If you are already planning landscape design and build work, drainage goes in first. The pipe belongs under the patio, not through it.
Why San Jose Homeowners Trust JPM Landscape
We are a licensed, bonded and insured California landscape contractor, CA License #963784, working in San Jose and Silicon Valley since 1984. Drainage is rarely a standalone job for us. It is built into the design-build work we have delivered across Santa Clara County for 40+ years, which is why our systems are planned around the finished yard instead of trenched through it afterward. That work has earned 12 Best of Houzz awards and a 4.9-star rating across 92 client reviews.
- “Great design and install support from Joe. Very responsive and creative.” — Sam, Google review
- “JPM Landscape did a beautiful job re-landscaping an area along the street side of my fence.” — Marilynn V., Google review
Drainage Questions San Jose Homeowners Ask
If water stands in your yard more than 24 hours after rain stops, you have a drainage problem. Other signs are soil spongy for days, moisture staining on the foundation, and lawn dying in the same patch each winter. One low spot may only need regrading; standing water in several areas means you need a designed system.
A French drain is a gravel-filled trench containing a perforated pipe in filter fabric that intercepts groundwater and carries it away by gravity. You need one when the problem is saturated soil rather than surface puddling, such as soggy ground days after rain or water against the foundation. In Santa Clara County clay it beats surface-only fixes, because the water is trapped in the soil, not sitting on top.
Most residential drainage projects in San Jose fall between $5,000 and $15,000 installed. Targeted fixes like downspout extensions or a single catch basin run $300 to $1,500; full systems with regrading can exceed $20,000. French drains are priced by the foot, generally $25 to $50.
Most residential drainage work in San Jose does not require a permit. One is typically needed for a retaining wall over three feet, work that alters drainage onto a neighboring property, or a connection to the municipal storm drain. We identify permit requirements during the assessment and handle the paperwork.
A properly built French drain with filter fabric, clean drain rock and correct slope commonly performs for 20 to 30 years. The two things that shorten it are root intrusion and silt migrating into the gravel, both prevented by wrapping the system correctly at installation. Keeping the outlet clear and inspecting it every few years is the whole maintenance job.
Trenching disturbs a narrow corridor of lawn or planting bed, and restoring it is part of the job. We route lines around mature trees and irrigation mainlines wherever grade allows, and cut sod in sections so it can be laid back down. Established trees are the one real constraint, and we plan around their roots.
Get Your Yard Dry Before the Next Storm
Standing water doesn’t resolve itself, and every storm makes the repair more expensive. We’ll walk your property, find where the water comes from, and give you a written plan and price at no cost. Licensed, bonded and insured, CA License #963784, 40+ years in San Jose and Silicon Valley.
