Mold needs moisture, so the first question in any mold job is where the water is coming from. The EPA advises drying water-damaged areas within 24 to 48 hours to prevent growth, and the California Department of Public Health puts the principle plainly: control the dampness and you control the mold. Cleaning without fixing the leak only buys time.
Small patches can be a do-it-yourself job. The EPA says that in most cases you can clean a moldy area smaller than about 10 square feet, roughly three feet by three feet, on your own. Larger areas, growth inside walls or ducts, and any mold caused by sewage or other contaminated water call for a restoration team. Never paint or caulk over mold, because it keeps growing underneath.
Mold work is unregulated at the state level. The Department of Public Health says California has no legal requirement for training, licensing or certification of mold assessors or remediators, and no state rules for mold inspection or removal. Ask which standard a company follows, how it will contain the work area and how it will show the space is clean.
Health effects vary from person to person. The CDC lists a stuffy nose, sore throat, coughing or wheezing, burning eyes and skin rashes, and warns that people with asthma or a mold allergy can react severely. Keep anyone with breathing problems out of affected rooms until the work is finished.
Under Health and Safety Code section 17920.3, dampness in habitable rooms and visible mold growth confirmed by a health officer or code enforcement officer can make a rental unit substandard, and the owner must fix it. Since January 1, 2022, landlords have had to give prospective tenants the state's mold and dampness booklet before a lease is signed. Report leaks in writing and keep copies.
For homeowners, the Department of Insurance says mold caused by a covered peril may be covered, while the NAIC notes that many policies exclude mold. Reporting the water damage promptly and drying it fast strengthens the link between the mold and the covered event.
Mold Remediation Services We Offer
✓Post-leak Mold Cleanup
Growth from a plumbing, roof or appliance leak removed once the water is stopped and the area is dry.
✓Moisture Source Tracking
Meters and inspection find the water feeding the mold so it does not return after cleanup.
✓Rental Property Mold Work
Cleanup coordinated with owners and tenants, with photos documenting conditions before and after.
How it works
- 1
Locate the moisture
The leak or damp source is found and stopped before cleanup begins.
- 2
Contain the area
The work zone is sealed off from the rest of the home.
- 3
Remove and clean
Moldy porous materials come out and remaining surfaces are cleaned.
- 4
Dry and check
The area is dried and checked before anything is rebuilt.