Winter Storm Prep Checklist for Orange County Homes
Most of the storm damage we clean up in January was preventable in October. This is the list, in priority order.
Before the season: clear gutters and hose-test every downspout and area drain, confirm grading still falls away from the house, inspect the roof after the first Santa Ana event, check that your main shut-off actually turns, and confirm what your policy excludes. Most of what we attend in January was preventable in October.
Southern California gets most of its rain in a handful of intense events, and the drainage on a typical property is sized for ordinary conditions.
The gap between those two facts is where our January workload comes from. Nearly all of it is preventable with an afternoon in October.
Priority one: every drain on the property
This is the highest-return item on the list by a wide margin. Blocked drainage causes more storm intrusion in South Orange County than any structural defect.
- Yard and area drains — lift every grate and clear it. Mature planting hides them and bark mulch fills them.
- Patio drains, which back up over a threshold with startling speed once blocked.
- Terrace drains and brow ditches on any slope above your property. On hillside lots these are the first line of defence.
- Driveway and garage-apron drains where they exist.
- Test each one with a hose. A drain that looks clear at the grate can be blocked six feet down.
Priority two: gutters and downspouts
- Clear gutters completely, including the corners where debris compacts.
- Check that downspouts actually discharge clear of the foundation — at least a few feet, ideally into a drain.
- Add extensions where they discharge against the wall. This is a five-minute fix that prevents chronic wall-base moisture.
- Check gutter fixings; loose brackets fail under the weight of a full gutter in a heavy storm.
- Look for tile fragments in the gutter — an excellent indicator that roof tiles have broken.
Priority three: the roof, after every wind event
This is the one homeowners skip and it produces the most expensive losses. Santa Ana winds crack and lift tiles between October and March; because those conditions are dry, nothing leaks and nobody inspects. Then the first real storm finds the exposed underlayment.
Inspect from the ground with binoculars after every significant wind event, and always before the first forecast rain. Look for slipped, cracked, missing or raised tiles, particularly at ridges, hips and edges, and check flashing at chimneys, skylights and wall junctions.
Do not walk on a tile roof. You will break more than you find. Get a roofer up there if anything looks wrong.
Priority four: grade and thresholds
Walk the perimeter of the house and look at the ground where it meets the wall. It should fall away from the building. On a great many Mission Viejo homes, forty years of mulch, planter build-up and landscape changes have raised soil above the slab edge — which puts water directly into the wall.
Then look at your lowest thresholds. A slider onto a patio, a garage apron, a light well. Those are where storm water enters, and knowing which one is your weak point lets you protect it deliberately.
Priority five: the things that fail while you are away
- Check the water heater age on its data plate. Past ten years in this water, plan the replacement rather than wait.
- Replace washing machine hoses if they are more than five to seven years old. Do it now while you are thinking about it.
- Test the main shutoff valve. Turn it off, check a tap runs dry, turn it back on. Seized valves are discovered at the worst possible moment.
- Test any sump pump by pouring water into the pit.
- Consider leak sensors at the water heater, washing machine and under sinks. They are inexpensive and they alert before water reaches a room.
For hillside and canyon-adjacent properties
If you are below a graded slope or open terrain — Sendero, Montanoso, Melinda Heights, or further out Foothill Ranch, Portola Hills and Dove Canyon — add a few items.
Walk the slope above your property and check terrace drains and swales. Note whether any terrain above you has burned in recent years; burned slopes shed water and debris for several seasons and change what a normal storm can do. Keep sandbags on hand if your property has ever taken runoff, and consider a diversion swale where water repeatedly takes the same path.
And one insurance item
Standard California homeowners policies exclude surface water from outside the building. If your property has ever taken storm water, get a flood quote — and do it in October, because NFIP policies generally carry a thirty-day waiting period and cannot be bought when a storm is forecast.
While you are talking to your broker, ask about a sewer and drain backup endorsement too. It is the most commonly missing coverage we encounter and it is inexpensive.
Frequently asked
When should I do all this?
October, before the first meaningful rain. The drains and gutters again mid-season if there has been significant leaf fall, and the roof after every significant wind event through to March.
What single item matters most?
Clearing every drain on the property. Blocked drainage causes more storm intrusion here than any other single factor, and it costs nothing but an afternoon.
Is storm intrusion covered by my insurance?
Usually not — surface water from outside the building is a flood exclusion on standard policies. Water entering through a storm-created opening, such as a wind-damaged roof, is generally treated differently. It is why documenting the entry path matters so much.
Expert insight
The October window
Two things only work if done early. Roof inspection after the first wind event catches the lifted tiles that become January ceiling leaks. And flood cover, if your property sits below a slope or near a channel, carries roughly a thirty-day waiting period — so it has to be bought before a forecast exists, not after one appears.
The bottom line
Drains, gutters, roof, grade, thresholds, and the appliances that fail while you are out. One afternoon in October.
If a storm has already got in, call — ground-contact water is a Category 3 job and it needs doing properly the first time.