Silt Fence & Storm Drain Protection in San Diego, CA

Silt fence and storm drain protection is the part of a construction job nobody notices until it fails. In San Diego, storm drains lead to local creeks, lagoons, the bay and the ocean, and the agencies that run them treat sediment from job sites as a pollutant. We install and maintain silt fence, fiber rolls, gravel bag barriers and inlet protection for builders, remodelers, pool contractors and homeowners with a grading permit, so the dirt you move stays on your lot.

Who regulates it

The San Diego Regional Water Quality Control Board issues a municipal storm sewer permit to 39 cities, counties and special districts across San Diego, south Orange and southwestern Riverside counties. That permit regulates what is allowed to leave the storm drain system and requires each co-permittee to develop and enforce rules against pollutants and illegal discharges, and the City of San Diego does that through its code enforcement and its Stormwater Standards Manual. On larger projects, California's Construction Stormwater General Permit applies on top of that whenever a site disturbs an acre or more, or belongs to a bigger development that does in total. The sediment controls on your plan are how you show compliance with both.

Silt fence installation done properly

Silt fence is simple, and that is why it is so often installed wrong. The fabric has to be trenched in at the bottom, usually in a narrow trench with the fabric folded into it and backfilled and compacted, so water cannot run underneath. Posts go on the downhill side at the spacing the detail calls for. The fence runs along the contour, not straight downhill, and the ends turn up the slope so water does not simply flow around them. It belongs below disturbed areas, never across a concentrated flow path like a swale or a gutter, where it will be overtopped or blown out. We follow the detail on your plan sheet, and where there is no plan, we follow the same practice.

Fiber rolls and gravel bags

On slopes, along the edges of paved areas and on tight urban lots where trenching silt fence is impractical, fiber rolls (straw or coir wattles) do a lot of the same work. They are staked into a shallow trench on contour to slow sheet flow and catch sediment. Gravel bag barriers are used where flow needs to pass through but sediment needs to settle out, such as along a curb line or at the outlet of a short channel. We mix these with silt fence based on what the ground and the plan call for.

Inlet protection

Any storm drain inlet downhill of your work, on the site or in the street, usually needs protection. Options include silt fence barriers around field inlets, gravel bag rings, sandbags, gravel and mesh filters and drop-in devices installed below the grate. Each traps sediment while still letting water drain so the street does not flood. Tracked mud is a common source of sediment at curb inlets, so we pair inlet protection with clean driveways and, where the plan calls for it, a stabilized construction entrance.

Sediment control through the storm season

Installation is only half the job. A silt fence full of sediment or knocked over by a delivery truck is not doing anything. San Diego's rain comes in short, heavy bursts, mostly from December through March, and a single storm can fill a barrier. We offer inspection and repair visits after storms: removing built-up sediment, restaking rolls, replacing torn fabric and resetting inlet protection. When the project is finished and the ground is stabilized with seed or landscaping, we pull the temporary controls so they do not become trash in the next storm.

Stabilized entrances and tracking

A lot of the sediment that reaches San Diego gutters never touches a silt fence. It leaves the site on truck tires. Where the plan calls for one, a stabilized construction entrance (a pad of coarse rock over fabric at the driveway) knocks mud off tires before they hit the street. Sweeping the street at the end of each day, and keeping stockpiles covered and back from the curb, take care of most of the rest.

Silt fence contractors and cost

We did not find a current consumer price per foot for silt fence, so we use public unit prices as a guide. The 2025 state road erosion prices we checked list unstabilized silt fence at $378 for 100 feet and the stabilized kind at $748 per 100 feet, with inlet protection from $102 each for a silt fence barrier up to $172 for a gravel and mesh filter. Silt fence contractors in San Diego price around length, ground conditions (rock and hard clay make trenching slow), access and how many maintenance visits the job needs. We give you that broken out in writing.

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