Crawlspace flooding in San Anselmo, CA
Water under the house is easy to miss and slow to leave. It raises humidity indoors, soaks floor framing and insulation, and can lead to mold. Here's what that looks like in San Anselmo, what to do, and how to get connected with an independent, licensed local provider.
Crawlspace flooding in San Anselmo: what we see
San Anselmo's older homes over crawlspaces, many close to San Anselmo Creek, are among the most likely in Marin to see water under the house. Creek overflows have affected parts of downtown in past storms, and even without flooding, saturated soil on the valley floor raises groundwater.
The local picture
Slopes and runoff. Where water comes from depends on where the house sits. San Anselmo spans the narrow Ross Valley floor with the creek through downtown, and wooded hillsides on both sides.
Creeks, tides and groundwater. Proximity to water affects groundwater and flood risk under the house. San Anselmo is shaped by San Anselmo Creek and Sleepy Hollow Creek, part of the Corte Madera Creek watershed, which has flooded parts of downtown and nearby streets in past storms.
Conditions vary a lot from street to street in San Anselmo, so a provider should assess your specific home.
What to do right now
- Don't enter a flooded crawlspace if wiring may be wet or if the water could be sewage or floodwater.
- Photograph the water level from the access hatch.
- Check your sump pump and its power, if you have one.
- Fix obvious sources you can reach safely, like a disconnected downspout.
- Call for professional pumping and drying.
Want a local pro to take a look?It's free for homeowners and there's no obligation.
San Anselmo checklist
- Keep valuables and equipment off the crawlspace floor, and know your flood-zone status.
- Clean gutters and extend downspouts well away from the foundation.
- Make sure soil slopes away from the house.
- Check that the vapor barrier covers the soil and isn't torn.
- Look under the house after the first big storm of the season.
How a provider handles it
Providers pump out the water, remove wet insulation and damaged vapor barrier, clean framing (and treat it after contaminated water), and dry with dehumidifiers while monitoring moisture in the wood. Lasting fixes usually involve drainage work. For the full picture, read our complete guide and the deep dive on crawlspace flooding in Marin. We also have a storm-season article on gutters and drainage for hillside homes.
Before you hire anyone, check the license on the CSLB website. Here's how we vet providers.
Nearby towns and more for San Anselmo
- Water Damage in San Anselmo: our full local page
- Crawlspace flooding service
- Burst pipe water damage in San Anselmo
- Sewage backup cleanup in San Anselmo
- Storm and flood damage in San Anselmo
- Same problem nearby: crawlspace flooding in Fairfax, crawlspace flooding in San Rafael, crawlspace flooding in Larkspur
Frequently asked questions
Will flood insurance cover my crawlspace?
Flood insurance has specific rules about what's covered below the first floor. Ask your agent and check FloodSmart.gov.
Is water in the crawlspace covered by insurance?
It depends on the cause. A sudden plumbing failure is treated differently from groundwater or outside flooding. Check your policy.
Will this cause mold?
Damp crawlspaces are a common source of mold. Dry it out and fix the source. See our sister site's crawlspace mold guide.