The rates used by Southwest Gas are set by state regulatory commissions using a process called the "rate case cycle." Because of individual state regulations, the rate case cycle differs slightly for each state. See how rates are set for your state.
Use this form to request historical Rates and Tariff information not available on this website. This form may also be used as a request to be placed on Southwest Gas' California Advice Letter Service List. If you have any questions regarding your bill, please contact Customer Assistance at
Tariff Schedules are provided as PDF (Portable Document Format) files. The Adobe® Acrobat® Reader plug-in (version 6.0 or higher) is needed to view the documents and can be downloaded for free. Versions are available for most platforms.