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You can reach the office at (925) 957-5280. Please have your Assessor's Parcel Number (APN) available when you call so staff can go directly to your account.
Questions regarding assessed values should be directed to the County Assessor. You can reach the office at (925) 313-7400, or if you follow this link, you can send them e-mail.
Questions regarding special taxes, assessments, fees and charges on your tax bill should be directed to the agency that requested them placed on your bill. The agencies' phone numbers are listed on your tax bill. The phone numbers also are available on the Tax Collector's website which is on your account detail page. (From the Account Lookup page, search for your account by APN or address. Select account detail to see detail showing the individual taxes and contact phone numbers where applicable.)
Questions regarding computation of property tax can be answered by the Auditor-Controller's staff. Please call (925) 646-2236 or email us with your question. Tax Collector Information
Nevertheless, if you have been waiting longer than a month, you may call our Office at (925) 646-1403 or email us with your name, mailing address, the subject parcel number, and the amount of the reduction the Assessor is processing and we will promptly research.
So until/unless you receive a revised bill, pay the tax bill you have. If this results in a net overpayment, a refund will be sent to you.
The escrow officer needs this information to ensure the tax portion of your closing is correctly handled. In particular, there are a few problems we see several times each year that tend to be difficult for taxpayers to resolve. Those problems can be avoided by making full disclosure to your escrow officer and in particular: