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    Disaster Relief - Contaminated Property

Qualified Contaminated Property


Proposition 1 allows for base year value transfers to from a qualified contaminated property to a replacement property within the same county.  A qualified contaminated property is one that has been designated as toxic or environmental hazard by a state or federal agency.  

About Proposition 1

California law allows an owner of a qualified contaminated property to transfer the base year value of that property to a comparable replacement property of equal or lesser value that is acquired or newly constructed after January 1, 1995.

In addition, a replacement property must meet all of the following requirements:

  1. It must have been acquired or newly constructed within five (5) years after the date of the sale or transfer; and
  2. It must be used in the same manner as the qualified contaminated property; and
  3. A claim for relief must be filed within three (3) years after the replacement property is acquired or newly constructed. 


  • Contaminated property and replacement property must be within the same county
  • Condition as a result of contamination
    • Residential must be uninhabitable – unfit for human habitation
    • Non-residential has to be unusable – unhealthy and unsuitable for occupancy
  • Owner limitation
    • Could not have caused contamination
    • Known of contamination when property was acquired or constructed
    • Be related to individual or entity that caused contamination
  • Contaminated property must be sold
  • Replacement must be acquired or constructed within 5 years after the sale of contaminated property
  • Replacement property must be comparable
    • Similar in function and utility – used in the same manner
    • Equal or lesser value

A claim must be filed within 3 years after the purchase or new construction of replacement property

In addition to the claim, the property owner must provide proof that he did not cause contamination.

Revenue & Taxation Code section 69.4

Contact Information

Deva Marie Proto

County Clerk-Recorder-Assessor-Registrar of Voters

Business Hours
Monday – Tuesday
8:00 AM – 5:00 PM
8:00 AM – 4:00 PM
Thursday – Friday
8:00 AM – 5:00 PM

Document processing and fee transactions end 30 minutes prior to closing

Registrar of Voters Hours

Monday - Friday
Open 8:00 AM – 5:00 PM

Contact us by Phone

County Clerk-Recorder Office

585 Fiscal Drive

Room 103

Santa Rosa, CA 95403
38.4659106, -122.7251807

Assessor's Office

585 Fiscal Drive
Room 104F
Santa Rosa, CA 95403
38.4659106, -122.7251807

Registrar of Voters

435 Fiscal Drive

Santa Rosa, CA 95403
38.4657357, -122.7251823

Disaster Relief Forms

Download Forms

Proposition 50: Claim for Intracounty Transfer of Base Year Value for Property Damaged or Destroyed in a Governor-Declared Disaster to Replacement Property within Sonoma County
Form BOE-65-P

Proposition 171: Claim for Intercounty Transfer of Base Year Value to Replacement Property from Principal Residence Damaged or Destroyed in a Governor-Declared Disaster between participating Counties
Form BOE-65-PT

Proposition 19: Transfer of Base Year Value to Replacement Primary Residence for Victims of Wildfire or Other Natural Disaster
Form BOE-19-V

Property Value

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Sonoma County Property Value

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