Pittsburg, CA Rental Property Rules: Mold Disclosure (2026)

Mold disclosure in Pittsburg follows California Health & Safety Code §26147, which requires landlords to provide written disclosure to prospective tenants prior to lease signing, and to existing tenants as soon as practical, when the landlord knows or has reasonable cause to believe that mold exceeds permissible exposure limits or poses a health threat. Because the California Department of Public Health has not adopted numerical permissible exposure limits, practical compliance focuses on visible mold. Under Health & Safety Code §17920.3, as amended by SB 655 (2015), the presence of visible mold growth (other than the minor sort found in showers) is an independent substandard housing condition that Pittsburg Code Enforcement can abate. Landlords are required to remediate mold caused by building defects such as roof leaks, plumbing failures, or inadequate ventilation. Tenants must not cause mold through their own unreasonable conduct. The implied warranty of habitability under Civil Code §1941.1 and Green v. Superior Court obligates landlords to maintain the unit free of conditions that endanger health. A tenant who discovers mold should notify the landlord in writing; if remediation is not performed within a reasonable time, remedies include repair-and-deduct (Civil Code §1942), withholding rent, or filing a complaint with Code Enforcement. Contra Costa Environmental Health can also respond to serious indoor air quality complaints.