If you have discovered water intrusion within your unit, you should first check with your landlord. Typically, structural or plumbing repair work is the landlord's responsibility. Problems with surface accumulation of mildew are the responsibility of the tenant to fix.
Mold is a similar problem to mildew, but may be caused by problems that go beyond the surface to deeper levels of the structure.
If you are not able to resolve your structural, plumbing, or mold issues with your landlord, you may call file a complaint at Sacramento County 311 Connect.
Get more information about mold issues, how to get rid of mold and additional contact information if you live within the cities of Sacramento, Citrus Heights, Elk Grove or Folsom at the Sacramento Environmental Management Department.