Looking for a basement waterproofing contractor in Sunnyside, WA? Describe your project once and up to three waterproofing contractors who work in Sunnyside and Yakima County get back to you with a quote. It's free and there is no obligation.
Sunnyside is home to about 16,317 people (2024 Census Bureau estimate), a stable community (−0.4% since 2020). With 2,161 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.
Sunnyside at a glance
- Population (Census Bureau estimate, 2024)
- 16,317 (−0.4% since 2020)
- Rank in Washington
- 68th of 281 cities and towns
- Land area
- 7.6 sq mi
- Population density
- 2,161 people per sq mi (suburban)
- Type
- City (Sunnyside city)
- Main county
- Yakima County
What to check before hiring in Sunnyside
- Outside first: check gutters, downspouts and grading before paying for a system.
- License and permit: in Washington, 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 Sunnyside
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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 Sunnyside
How much does basement waterproofing cost in Sunnyside, WA?
It depends on the system and the size of the basement. Describe the problem: contractors who serve Sunnyside 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 Sunnyside 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.