Hillsboro spreads across the flat floor of the Tualatin Valley, laced with creeks that drain the farmland and hills to the north and west. Dairy, McKay, Rock, Dawson and Turner creeks all cross or border the city, and the Tualatin River itself forms part of the southern edge near the Jackson Bottom Wetlands Preserve. Low relief and slow-moving water are the defining features here, and they shape how winter storms turn into water problems inside homes.
Our phone line, (888) 317-9980, answers around the clock. Calls go to independent restoration providers that serve Hillsboro and the rest of Washington County; the provider assesses the damage and agrees on the scope of work with you directly. The referral costs nothing, and no restoration work is done by The Restoration Job itself.
How the call works: when you call (888) 317-9980, The Restoration Job connects you with an independent restoration provider that serves Hillsboro. That provider inspects the damage, explains the scope and quotes the work. The Restoration Job doesn't perform restoration itself. Read our referral disclosure.
A Slow River on a Flat Valley Floor
The Tualatin is an unusual river. It drops about 1,800 feet in its first 12 miles out of the Coast Range, then only about 250 feet over the remaining 71 miles to the Willamette. By the time it passes Hillsboro, around river mile 45, it is a slow, meandering stream. Slow water drains slowly, so when a series of winter storms arrives, low fields and creek corridors on the south and west sides of the city can stay wet for days after the rain stops.
The highest flow ever recorded on the river came on February 10, 1996, at 26,400 cubic feet per second at the West Linn gauge, many times its average. Homes close to the creeks that feed the Tualatin are more likely to see standing water in yards, crawl spaces and garages during events like that. Floodwater from a creek or the river is contaminated, so flood cleanup means removing soaked porous materials before drying, not simply running fans.
Newer Subdivisions, Apartments and Hidden Plumbing Leaks
Much of Hillsboro has been built in the past few decades, from the transit-oriented blocks of Orenco Station to apartment and townhome communities around Tanasbourne and Amberglen. Newer construction changes the typical call. Instead of old galvanized pipes, the problems are failed washing machine hoses, leaking dishwasher connections, water heater tanks in garages and upstairs bathrooms, and shower pans that seep into the ceiling below.
In multi-story apartments and townhomes, one leak can involve several units and an association. Tenants should alert management at once; owners in a townhome community should check the association's documents to see who is responsible for shared walls, roofs and supply lines. A provider will use moisture meters and sometimes thermal imaging to trace how far water traveled inside walls and floor systems before setting up structural drying.
Heat Records, Freezes and the Wet Months
Hillsboro gets around 38 inches of precipitation a year, spread across roughly 161 days, with November through March the wettest stretch. The valley also sees temperature extremes: the city recorded 114°F on June 28, 2021, and -14°F back in January 1930. Cold snaps are infrequent, which is exactly why pipes in garages, exterior walls and crawl spaces often have little insulation when one arrives.
Before a freeze, disconnect garden hoses, cover hose bibs, and open cabinet doors under sinks on exterior walls. If a pipe splits, shut the main valve first, then call for help. Clean water caught within the first day is usually the easiest kind of loss to dry in place.
How a Hillsboro Drying Job Usually Unfolds
- Inspection and source check: confirming the leak is stopped and classifying the water as clean, gray or contaminated.
- Extraction: pulling standing water from carpet, pad and hard floors with truck-mounted or portable units.
- Moisture mapping: readings in drywall, baseboards, subfloor and framing to decide what stays and what goes.
- Drying: air movers and dehumidifiers, typically left running for several days with daily readings.
- Repairs: drywall, flooring and trim replacement once materials reach dry standard.
Photograph everything before work starts and keep the provider's moisture logs for your insurance claim.
Mold Risk in a Damp Valley Climate
Winter fog and drizzle keep indoor humidity high in much of the Tualatin Valley, and that slows natural drying. Drywall, carpet pad and wood framing that stay wet beyond a day or two can begin growing mold, especially in a crawl space or behind a bathroom wall where no one looks. A musty smell is often the earliest clue.
Where growth has started, mold remediation focuses on containment, removing affected materials and fixing the moisture source. Nearby Beaverton shares many of the same creek-and-crawl-space conditions.
Where Callers in the Hillsboro Area Are
Calls come in from across Hillsboro, including:
- Orenco Station
- Tanasbourne
- Amberglen
The same line also serves nearby communities such as:
Questions From Hillsboro Property Owners
Who handles storm drains and sewer lines in Hillsboro?
Clean Water Services is the water resources utility for urban Washington County, serving more than 600,000 people in the Tualatin River watershed. It can take reports of problems with public sewer and stormwater systems at 503-681-3600. Problems inside your house or on your private side sewer line are generally the property owner's responsibility, so call a plumber for the line and a restoration provider for the cleanup.
Does the Tualatin River flood into Hillsboro neighborhoods?
Most of the city sits above the river, but low ground along the Tualatin on the south side and along creeks such as Dairy, McKay and Rock Creek can flood in prolonged storms. The record flow came in February 1996. Check your exact address on FEMA's Flood Map Service Center and talk to your agent about flood coverage, which is separate from a standard homeowners policy.
My upstairs bathroom leaked into the kitchen ceiling. Can it be dried or does it need to be replaced?
It depends on how long the water sat and what it soaked. Clean water caught quickly can often be dried with the ceiling drywall left in place, sometimes after drilling small vent holes. Sagging drywall, wet insulation above it or signs of mold usually mean removal. A moisture meter, not a visual check, should guide that decision.