40-361. Charges by public service corporations required to be just and reasonable; service and facilities required to be adequate, efficient and reasonable; rules and regulations relating to charges or service required to be just and reasonable A. Charges demanded or received by a public service corporation for any commodity or service shall be just and reasonable. Every unjust or unreasonable charge demanded or received is prohibited and unlawful. B. Every public service corporation shall furnish and maintain such service, equipment and facilities as will promote the safety, health, comfort and convenience of its patrons, employees and the public, and as will be in all respects adequate, efficient and reasonable. C. All rules and regulations made by a public service corporation affecting or pertaining to its charges or service to the public shall be just and reasonable.
Arizona Legal Code