Looking for a drainage contractor in Rainier, OR? Describe your project once and up to five drainage contractors who work in Rainier and Columbia County get back to you with a quote. It's free and there is no obligation.
Rainier is home to about 1,932 people (2024 Census Bureau estimate), a growing community (+1.5% since 2020). With 473 people per sq mi, it is a semi-rural area. Heavy rains, clay soils and flat lots are common causes of soggy yards here.
Rainier at a glance
- Population (Census Bureau estimate, 2024)
- 1,932 (+1.5% since 2020)
- Rank in Oregon
- 125th of 240 cities and towns
- Land area
- 4.1 sq mi
- Population density
- 473 people per sq mi (semi-rural)
- Type
- City (Rainier city)
- Main county
- Columbia County
What to check before hiring in Rainier
- 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 Oregon, 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 Rainier
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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 Rainier
How much does yard drainage cost in Rainier, OR?
It depends on the length of drain, the depth and the outlet. Describe the problem: contractors who serve Rainier 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 Rainier 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.