Serving Ontario
Groundwater & Basement Water Intrusion in Ontario, CA
Basement seepage, failed sumps, and hydrostatic pressure against the foundation are extracted and dried, and the path from the ground is identified so the loss does not repeat. Groundwater and basement seepage are extracted and dried only after the path from the soil is identified — a wall, a slab, a drain, or a failed sump. Drying the interior without stopping that path returns the same water to the same floor.
Frequently asked questions
Debris arrived with the water and made everything worse.
That is the fan mechanism and it is why these events escalate. Sediment blocks the inlets and channels that would otherwise carry water away, so flooding deepens as the storm continues rather than easing. Inside, mud works into porous materials in a way clean water does not, and those generally come out. Clearing the drainage path before the next storm matters as much as anything done indoors.
The rain gauge said half an inch.
What fell on your roof is a poor guide to what arrives from the mountains. They shed close to everything, and the fans deliver it downhill within minutes, so a modest valley reading is entirely consistent with substantial flow across the property. Watching conditions on the range rather than at the house is the habit that gives useful warning here.
There has been a fire in the range above us.
Then plan on several worse seasons rather than one. Burned ground sheds far more water and carries far more material, so routine flows become damaging and debris becomes the main hazard. The historical record for your property understates the risk while the range recovers. Clearing and maintaining whatever channels exist upstream of the house matters more during those years than at any other time.
The same questions, in context, on the Ontario mold removal page.