Basement Waterproofing in Auburn, WA

Basement waterproofing in Auburn: what to know

Borings and test pits drilled near Auburn and Algona for a King County facility found groundwater between about 3 and 15 feet down, with seasonal swings of up to 10 feet. A basement floor or deep footing on the valley floor can sit near or below the water table for part of the year. A wall membrane alone does not relieve that pressure.

On the hillsides the ground is generally capped with dense glacial till, and rain tends to travel along the top of it toward the downhill wall, so gutters, grading, and the footing drain matter more. The city also reports minor street flooding from clogged storm drains nearly every year, so the first check is whether the water comes from your lot or from the street.

Permits and rules in Auburn

Interior drainage, membranes, and regrading generally sit outside building permit review. The rules start with digging: work in the public way takes a construction permit from the city engineer, and a house in the Special Flood Hazard Area faces the floodplain chapter even for repairs. A foundation drain can never end in the sanitary sewer or on a neighbor’s lot. We look up the flood mapping and the legal discharge point with Auburn Community Development before we quote.

Rules change and vary by parcel, so we confirm the current requirements with the city before we start.

How we approach it

Find whether the house sits on valley alluvium or hillside glacial till
Read wet-season water levels before choosing exterior or interior drainage
Plan a sump and pump discharge where the lot offers no gravity outlet
Separate water from your roof and yard from water coming off the street

For the full process, see our Basement Waterproofing page.

Our basement waterproofing work, serving Auburn

Examples of our work. We build basement waterproofing in Auburn and the cities around it. See all of our work

Questions from Auburn homeowners

Can a footing drain work on the Auburn valley floor?

Often, but it needs an outlet lower than the footing. Borings near Auburn found groundwater from about 3 to 15 feet down, so flat valley lots may need a sump pump instead of a gravity line. We check outlet options first.

Will waterproofing protect my Auburn home from Green River flooding?

No. Waterproofing handles groundwater and runoff at the foundation, not river flooding. The city says flooding concentrates in low areas along the Green and White Rivers, with Howard Hanson Dam helping control it. A mapped floodplain also brings city permit rules for repairs.

My house is on Lea Hill in Auburn. Where is the basement water coming from?

Often from above and from the roof. Upland ground around the valley is generally capped with dense glacial till, so rain and slope runoff travel along it and load the high-side wall. We trace downspouts and grading first.