Looking for a drainage contractor in San Marcos, CA? Describe your project once and up to five drainage contractors who work in San Marcos and San Diego County get back to you with a quote. It's free and there is no obligation.
San Marcos is home to about 96,620 people (2024 Census Bureau estimate), a growing community (+1.8% since 2020). With 3,932 people per sq mi, it is a densely built-up area. Heavy rains, clay soils and flat lots are common causes of soggy yards here.
San Marcos at a glance
- Population (Census Bureau estimate, 2024)
- 96,620 (+1.8% since 2020)
- Rank in California
- 79th of 482 cities and towns
- Land area
- 25 sq mi
- Population density
- 3,932 people per sq mi (densely built-up)
- Type
- City (San Marcos city)
- Main county
- San Diego County
What to check before hiring in San Marcos
- Call 811: utilities must be marked before digging.
- Outlet: ask where the water will go; local rules limit discharges toward neighbors and streets.
- Permits: in California, large grading jobs may need a permit from the city or county.
- Price drivers: length of drain, depth, outlet, and lawn or hardscape restoration.
Useful official resources
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Call 811
Official information and guidance.
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EPA: green infrastructure for homeowners
Official information and guidance.
Services available in San Marcos
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French drain or yard drain
French drain, catch basins or channel drains to move water away from the problem area.
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Grading and regrading
Regrading the soil so that water flows away from the house.
Frequently asked questions in San Marcos
How much does yard drainage cost in San Marcos, CA?
It depends on the length of drain, the depth and the outlet. Describe the problem: contractors who serve San Marcos reply with a quote.
How long does it take?
Most residential drains take one to three days.
Will a drain fix a wet basement?
It can help when water comes from the yard; inside problems may need waterproofing too.
Which drainage contractors will contact me?
Up to five independent drainage contractors who serve San Marcos and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.