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Water Damage After an Atmospheric River or Winter Storm in California

An atmospheric river is a long, narrow band of moisture in the sky that can bring days of heavy rain to California, and a winter storm can do the same in a shorter, sharper burst. Both can send a large amount of water at a house in a short time, and the house has to deal with more water, faster, than it was built to handle. Roofs leak, drains back up, and water finds its way in through every weak point at once. The result is a house that is wet in several rooms, and a job that is bigger than a single leak.

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This guide covers water damage after an atmospheric river or a winter storm in California in general terms: the weather, safety first, and the removal, drying, cleaning, and repair that follow. No claim is made about any specific storm or any particular place's flood history, because those are facts about a specific event, not something a statewide guide can state.

Atmospheric rivers and winter storms in general terms

In general terms, an atmospheric river is a band of moist air that carries a large amount of water vapour, and when it reaches land it can release that water as heavy rain over several days. A winter storm is a shorter event, often bringing heavy rain, wind, and, in the mountains, snow, in a single burst. Both can overwhelm the drainage around a house, and both can send water into a house through the roof, the windows, the doors, and the drains, often at the same time.

The amount of water matters more than the name of the weather. A house that has dealt with ordinary rain for years can be overwhelmed by several days of heavy rain, because the ground becomes saturated, the drains cannot take the flow, and the roof is asked to shed more water than it was built to handle. The result is water inside the house, and the restoration process that follows is the same whatever the weather that caused it.

Safety first

After an atmospheric river or a winter storm, safety comes first, and it comes before any cleanup work starts. Do not enter a flooded building until it has been checked, do not touch electrics in or near standing water, and do not try to clean up storm water yourself if it may be contaminated. Do not go outside during the storm to clear a drain or a gutter, and do not climb onto a roof to look for damage, especially in wind or rain. The weather is a hazard in itself, and the work can wait until it has passed.

Inside the house, keep children and pets out of any room with standing water, and do not switch on lights or fans in a room where water has reached the wiring. If a ceiling is sagging, do not stand under it. If the water smells of sewage, keep everyone well clear. Flood damage cleanup covers the removal, the cleaning, and the drying in general terms, and the visit starts with an inspection of how far the water has spread.

Water Damage After an Atmospheric River or Winter Storm in California — California water damage restoration guide

Removal, drying, cleaning and repair

The restoration process after a storm follows the usual order: inspection, water removal, drying, cleaning, and repair. The inspection maps how far the water has spread, including behind walls and under floors, and it considers the category of the water, because storm water that has mixed with drain water is handled differently from clean rainwater. Emergency water removal gets the standing water out, then the structure is dried with air movement and dehumidification, and the moisture is checked as the drying goes on.

The cleaning stage deals with what the water carried with it, and the repair stage puts back the drywall, flooring, or skirting that had to come out. The roof, the windows, or the doors that let the water in are a separate question from the water damage they caused, and the scope of any repair to them is something to confirm with the person who does that work. Water damage restoration covers the water inside the house, and the building envelope is a separate trade.

No claim about any specific storm or place

No claim is made here about any specific storm, or about the flood history of any particular place. Atmospheric rivers and winter storms vary, and the effect on a particular house depends on its location, its construction, and the storm itself, none of which a statewide guide can state. What can be said in general terms is that heavy rain over several days can overwhelm drainage and send water into houses, and that the restoration process is the same whatever the storm that caused it.

Homeowners in San Jose and across California face the same restoration process after a storm, because the sequence does not change with the city. The storm is different each time, but the work that follows is the same, and the safety rules are the same too. The weather is the cause, and the restoration is the response, and the two are best kept separate in the mind as well as in the work.

What to do after the weather passes

When the weather has passed and it is safe to go outside, walk around the house and look for the places the water got in, but do not climb onto the roof and do not attempt any repair yourself. Take photos of the damage from the ground, and note where the water came in and which rooms are affected. Inside the house, move belongings away from the water where you can do so safely, and take photos of every affected room from the doorway without stepping into standing water.

Then call a professional and describe what you found. The visit will start with an inspection, then water removal, then drying and a check for damage you cannot see. The inspection is what turns a storm-damaged house into a clear plan, and it is the step that stops a small leak from becoming a large repair. Do not wait to see whether the house dries on its own, because it will not, and the water that is left in the structure keeps soaking deeper while you wait.

Preparing for the next wet season

After an atmospheric river or a winter storm, the natural question is how to prepare for the next wet season, and the answer is worth thinking about while the memory of the last one is fresh. In general terms, preparation means checking the weak points before the rain starts: the roof, the windows, the doors, and the drains. Look at the roof from the ground for tiles that have moved. Check the gutters and the downpipes for blockages. Look at the doors for gaps at the threshold. Check that the water shut-off turns, and that everyone in the household knows where it is. These are general checks, and they do not replace a professional look.

No preparation can promise that a house will not be damaged by the next wet season, and this guide does not try to give one. What preparation can do is reduce the risk, and make the house easier to deal with if water does get in. A house that has been checked before the rain is a house whose weak points are known, and a house whose weak points are known is a house that can be watched. The wet season will come again, and the preparation is the same each time, and it is worth the afternoon it takes to do it properly.

Key Takeaways

In general terms, an atmospheric river is a band of moist air that carries a large amount of water vapour, and when it reaches land it can release that water as heavy rain over several days.
After an atmospheric river or a winter storm, safety comes first, and it comes before any cleanup work starts.
The restoration process after a storm follows the usual order: inspection, water removal, drying, cleaning, and repair.
No claim is made here about any specific storm, or about the flood history of any particular place.
When the weather has passed and it is safe to go outside, walk around the house and look for the places the water got in, but do not climb onto the roof and do not attempt any repair yourself.
After an atmospheric river or a winter storm, the natural question is how to prepare for the next wet season, and the answer is worth thinking about while the memory of the last one is fresh.

Your Next Step

If this guide matches what you found at home, the next step is a visit — not a guess. Call and describe what you found, and the visit is arranged from what you describe. The Water Damage Restoration page explains what that service covers, and the Water Damage Restoration page explains what that service covers, and the services hub lists every service in one place.

Do not use a household vacuum on standing water while you wait, and if water is still coming in, turn off the shut-off valve for that fixture where you can reach it safely.

Keep the guides on this site bookmarked: the first guide, the signs guide, and the preparation guide cover the checks worth repeating — after moving in, and after bringing used fixtures home.

Water damage help is available across California. See water damage restoration in Manhattan Beach, CA for one local example, or find your town on the service areas page.