Storm season in Southern California has changed over the last decade. Atmospheric rivers drop in three or four inches of rain in a day on a region that drains slowly, and homes that never had drainage problems start finding them. October is the right month to address plumbing exposure before the first major storm.
Here is the storm-season plumbing prep checklist for Southern California homes and the items most worth addressing before the rains start.
Clear and inspect your cleanouts
Walk your property and locate every sewer cleanout. Confirm caps thread off cleanly. Replace any caps that look brittle or have cracked. When the line backs up at 10 PM during the season’s first heavy storm, you do not want to be excavating buried cleanouts in the rain.
Hydro jet the main
A line that runs sluggish in dry weather backs up entirely in wet weather. Schedule a hydro jet cleaning before the rains. The National Weather Service flood-safety guide emphasizes pre-season preparation, and your sewer lateral is the most-overlooked item on most homeowner checklists.
Test the sump pump
If you have a sump pump for a crawl space or below-grade utility room, test it. Fill the pit with a hose, confirm the pump cycles, verify the discharge is clear. Replace pumps older than 7 years preventively — they fail silently and the first sign of failure is usually the flood.
Inspect the backwater valve
If your home has a backwater valve, lift the cover and confirm the flap moves freely. Clean any debris from the seat. Replace the flap rubber if it has hardened. If you do not have one and your home sits where city main backups are possible, install one before the next big storm.
Clear gutters and downspouts
Gutter and downspout maintenance is usually a roofing concern but it shows up as a plumbing problem when discharge concentrates near the foundation. Extend downspouts at least 5 feet away from the house. For any French drain at the perimeter, test that water flows through it freely.
Outdoor hose bibs and irrigation
Inspect every hose bib for leaks. Disconnect hoses. Check the irrigation backflow assembly and the manifold for damage from summer sun. Confirm the irrigation controller program is shifting toward winter watering schedules.
Small repairs that are easier now than during a storm
The shutoff valve that does not turn smoothly. The toilet flapper that has been weakening. The shower diverter that takes ten seconds to engage. Each of these is a 30-minute fix in dry weather and a much harder problem to handle while emergency conditions are also unfolding.
For homeowners with longer punch lists, professional general handyman services for home repair projects handle the bundle of small items that have been deferred. For specifically trim, finish, and small carpentry work that often pairs with plumbing repairs, skilled handyman support for finish carpentry covers the scope plumbers do not.
Document existing conditions
Walk every exterior side of the house with your phone and photograph current conditions before the season starts. Foundation, hardscape, gutters, downspouts, plumbing penetrations. If a storm causes damage, these “before” photos are what get insurance claims paid quickly.
Build an emergency kit
Locate the main shutoff. Confirm it turns. Keep a flashlight, towels, plunger, and a phone-charger backup near the shutoff so an after-hours emergency response is fast.
Your Southern California Storm Season Plumbing Specialists
At Pacific Coast Elite Plumbing, we run pre-storm plumbing inspections, hydro jetting, sump pump testing, and backwater valve installation across Southern California. Contact us in September or early October to book pre-season service. Our plumbing services cover the full Southern California region 24/7.