Looking for a basement waterproofing contractor in Sierra Madre, CA? Describe your project once and up to three waterproofing contractors who work in Sierra Madre and Los Angeles County get back to you with a quote. It's free and there is no obligation.
Sierra Madre is home to about 10,775 people (2024 Census Bureau estimate), a shrinking community (−4.4% since 2020). With 3,651 people per sq mi, it is a suburban area. Heavy rains, high water tables and older foundations are the usual causes of wet basements here.
Sierra Madre at a glance
- Population (Census Bureau estimate, 2024)
- 10,775 (−4.4% since 2020)
- Rank in California
- 367th of 482 cities and towns
- Land area
- 3.0 sq mi
- Population density
- 3,651 people per sq mi (suburban)
- Type
- City (Sierra Madre city)
- Main county
- Los Angeles County
What to check before hiring in Sierra Madre
- Outside first: check gutters, downspouts and grading before paying for a system.
- License and permit: in California, check the contractor's license and whether a permit is needed.
- Warranty: ask what it covers, whether it is transferable and who backs it.
- Price drivers: wall length, system type, sump pumps and excavation.
Useful official resources
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EPA: mold
Official information and guidance.
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ICC: International Code Council
Official information and guidance.
Services available in Sierra Madre
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Interior drain tile and sump pump
Interior perimeter drain, sump pump and vapor barrier to keep water out of the basement.
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Exterior waterproofing
Excavation, membrane and footing drain on the outside of foundation walls.
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Basement crack sealing
Injection or sealing of leaking cracks in poured or block foundation walls.
Frequently asked questions in Sierra Madre
How much does basement waterproofing cost in Sierra Madre, CA?
It depends on the system and the size of the basement. Describe the problem: contractors who serve Sierra Madre reply with a quote.
How long does it take?
Interior systems often take a few days; exterior work takes longer.
Will waterproofing stop mold?
It removes the main cause. Existing mold should be cleaned up separately.
Which waterproofing contractors will contact me?
Up to three independent waterproofing contractors who serve Sierra Madre 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.