Please fill out all fields below to the best of your knowledge. Read through how to apply for a business license.Contra Costa County - Business License Online Application ; Select your business type ; Will your business operate inside the unincorporated areas of the county? Exemption forms are due June 30th each year. Once forms are filed exemption is automatically renewed each year. Contact: Darin Gale, Assistant City Manager. Phone: 925.516.5181. Sign each copy of the form. 6. Please note that exempt projects are no longer considered exempt when a Waste Management Plan is required. Congratulations Arts Contra Costa County!