The first hour with water in the basement
- Gas smell? Get out, call 911 from outside, then your gas utility (its number is further down this page), and don't go back down for anything.
- Stay off the stairs if water covers outlets, the furnace or the panel, and never stand in water to reach a switch.
- If the water rose through a drain or toilet, stop running water anywhere in the house until someone finds the cause.
- Take photos of how high the water stands before any pumping starts, then ring your insurer and describe the loss as it happened.
- Keep children out. EPA says people with asthma or weak immune systems, children and pregnant people should not take part in flood cleanup.
- Next, the restoration line above. If you hold an NFIP policy, FEMA's help line is (877) 336-2627.
How long it sat wet, and what an older basement may contain
EPA says mold can grow on wood, drywall, carpet and furniture that stay wet for more than 24 hours. Tell the company when the water arrived and where it came from.
Older houses add a second risk, because EPA notes that older homes and buildings may have materials containing asbestos or lead. Under Labor Code 6501.5, an employer doing asbestos-related work on 100 square feet or more of asbestos-containing material has to register with Cal/OSHA first. Ask how the company plans for that.
How much flooded basement cleanup costs in California (estimates, not quotes)
Our estimate for flooded basement cleanup is $1,950 to $10,200 per job, and the table's second estimate row gives the per square foot figure; both are models, not quotes. Insured flood losses give a different scale. Our count of OpenFEMA's NFIP claim records for California losses since 2023 is in the table, and it shows what insurers paid, which isn't a cleanup price.
| Item | Figure | What it is |
|---|---|---|
| Estimated range, not a quote | $1,950 to $10,200 per job | Built from 2 national published ranges, adjusted by the California hazardous materials removal worker wage ratio (1.08). No California water, fire or sewage restoration company published a price we could count. Three California mold-inspection firms publish inspection prices, which are not a restoration job and are not used in these rows. Basis: no state company sample (no counted California company price for this job), national estimate only. |
| Estimated range per square foot, not a quote | $4 to $15 per square foot | Built from one national published range, adjusted by the California hazardous materials removal worker wage ratio (1.08). No California water, fire or sewage restoration company published a price we could count. Three California mold-inspection firms publish inspection prices, which are not a restoration job and are not used in these rows. Basis: no state company sample (no counted California company price for this job), national estimate only. |
| Hazardous materials removal worker wage, California mean | $29.21 an hour (United States mean: $27.13) | BLS May 2025 pay for the nearest federal occupation; the estimate uses its ratio to the national mean. |
| Same occupation, California median | $26.98 an hour (middle half of workers: $22.68 to $32.47) | The BLS figures as O*NET OnLine prints them. Treating this occupation as a restoration crew is our inference. |
| Same occupation, San Francisco-Oakland-Fremont and Sacramento medians | $28.65 and $24.28 an hour | Pay in two Northern California metros, which isn't what a company bills. |
| NFIP claims paid in California, losses dated 2023 or later | 1,741 of 2,728 claim records show a payment; mean about $64,000, median about $30,000 | Our own count of OpenFEMA records (building plus contents), queried 2026-10-20; FEMA didn't publish these figures, and they're insurer payments, not cleanup prices. |
Estimated range. Built from national published ranges (2 sources), adjusted by California's hazardous materials removal worker wage ratio to the US (1.08, BLS May 2025). Not a quote. No California restoration company published a water, fire or sewage price we could count. We have no counted California company price for this job, so the range is our national estimate alone. Full method. Prices as of Oct 23, 2026.
Which policy pays for basement water
CDI's residential guide lists flood and mold among the perils a homeowners policy usually excludes. Flood cover is a separate NFIP policy, with building coverage up to $250,000 and contents up to $100,000, and FloodSmart lists personal property kept in basements among the items it won't pay for. Mold's out too.
FEMA says the 30-day wait doesn't apply when a government-backed lender requires the policy or when it follows a community flood map change. A flood caused or worsened by a wildfire on federal land gets a one-day wait if you buy within 60 days of containment. Before you sign with a cleaning contractor, FloodSmart says to talk to your agent or adjuster. Ask the adjuster for a Flood Control Number card dated for the current storm year, and expect four to eight weeks before the claim is finalized and paid, by FloodSmart's count.
When the backup came from a city sewer main
Government Code 911.2(a) gives six months after the cause of action accrues to present a claim to a public entity for injury to person or personal property, and one year for other claims. Under that section, a sewer-main backup claim against a city or sanitation district runs on those clocks. Damaged belongings count as personal property, so write down the date you found the water.
When a flooded basement can't wait
- Water is still rising or entering.
- Water has reached outlets, the furnace, the water heater or the panel.
- Dirty water is coming out of a floor drain or a toilet bowl.
- You smell gas, or someone in the house has asthma or a weak immune system.
- A damp patch with no standing water, which you can photograph for the insurer before anyone dries it.
- A repaint or other cosmetic repair, once the insurer has inspected.
Flooded basement repairs: which licenses and permits apply
CSLB's classification list has no class for flood cleanup or water damage. Rebuilding is another matter: B&P 7026 counts anyone who repairs or alters a structure as a contractor, and B&P 7048 exempts a project only when it's under $1,000, casual and minor, and needs no building permit. Ask whoever rebuilds the basement for a CSLB license number.
Repairs permitted from 2026 are plan-checked to the 2025 California Building Standards Code. After an emergency declaration, Penal Code 396 holds repair and reconstruction prices to 10 percent above the pre-declaration price for 180 days, unless the increase comes from higher costs.
Ask which licenses your state requires for the work, and check them with your state's licensing office before anyone starts. A credential from a private body, such as IICRC, isn't a license.
Questions people ask
Who should I call when my basement floods in California?
Phone the restoration line on this page and your insurer. NFIP policyholders can call FEMA at (877) 336-2627. If a public sewer caused it, note the date, because a personal-property claim to a public entity has a six-month clock under Government Code 911.2.
Will a homeowners policy pay for a flooded basement in California?
CDI's guide lists flood, mold, and seepage or leaks among perils usually excluded, and sudden and accidental water damage among those generally covered. Ask the insurer which one it's applying to your loss.
What does flooded basement cleanup cost in California?
No counted California company price sits behind that figure. It starts from national published ranges, scaled by California's wage ratio to the US for the nearest federal occupation.
Is flood insurance effective immediately?
FEMA's exceptions include a policy a government-backed lender requires and one tied to a community flood map change. FloodSmart adds a one-day wait for a flood caused or worsened by a wildfire on federal land when you buy within 60 days of containment.
Can I clean a flooded basement on my own?
Those are people with asthma or weak immune systems, children and pregnant people, by EPA's list. EPA also warns that older buildings may have asbestos or lead in their materials.
- U.S. Bureau of Labor Statistics, OEWS May 2025: Hazardous Materials Removal Workers (SOC 47-4041), California, mean hourly wage Read Oct 23, 2026.
- U.S. Bureau of Labor Statistics, OEWS May 2025: Hazardous Materials Removal Workers (SOC 47-4041), United States, mean hourly wage Read Oct 23, 2026.
- RestorationMatch: how we estimate costs, California (editorial policy) Read Oct 23, 2026.
- O*NET OnLine: California wages, 47-4041.00 Read Oct 20, 2026.
- OpenFEMA NFIP Claims and Policies v3 (California) Read Oct 20, 2026. Check with the source before you rely on this.
- Flood Cleanup (EPA) Read Oct 19, 2026.
- Labor Code 6501.5 Read Oct 20, 2026.
- CDI: Residential Insurance (Homeowners and Renters) information guide Read Oct 20, 2026.
- FloodSmart (NFIP): Buy a policy Read Oct 19, 2026.
- FloodSmart (NFIP): Start a claim Read Oct 19, 2026.
- FEMA: Flood Insurance Read Oct 20, 2026.
- Government Code 911.2 Read Oct 20, 2026.
- CSLB Licensing Classifications Read Oct 20, 2026.
- B&P Code 7048 (current text) Read Oct 20, 2026.
- CBSC: Codes (Title 24) and home page Read Oct 20, 2026.
- Penal Code 396; Attorney General price-gouging page Read Oct 20, 2026.
- PG&E: Gas safety Read Oct 20, 2026.
- SoCalGas: Emergency information Read Oct 20, 2026.
- SDG&E: Gas safety Read Oct 20, 2026.
- B&P Code 7026 Read Oct 20, 2026.