Section 507.1 of the IFC is deleted in its entirety and replaced as follows:

(1) The minimum water supply requirements contained in this section shall apply to land use and construction permit actions subject to this title, or to any other existing or future code provision in which compliance with the fire code is specifically required. Water mains and fire hydrants shall meet the required minimum standards for water mains and fire hydrants. These requirements shall apply to land use and construction permit actions subject to this title, or to any other existing or future code provision in which compliance with the fire code is specifically required.

(2) In administering these requirements, the fire marshal or the fire marshal’s designee shall have the authority to impose conditions on permits issued under this title where necessary to mitigate fire hazards.

(3) A water supply shall consist of reservoirs, pressure tanks, elevated tanks, water mains or other fixed systems capable of providing the required fire flow. Required water supply for fire protection shall include:

(a) An approved water supply capable of supplying the required water flow for fire protection shall be provided to premises upon which facilities, buildings or portions of buildings are hereafter constructed or moved into or within the jurisdictions.

(b) All land upon which buildings or portions of buildings are or may be constructed, erected, enlarged, altered, repaired, moved into the jurisdiction, or improved, shall be served by a water supply designed to meet the required fire flow for fire protection as set out in appendix B of the IFC, except that fire flow requirements for rural areas outside of an Urban Growth Area shall be reduced by 25 percent. Fire flow requirements for structures with a supervised fire alarm system connected to an Underwriters Laboratory, Inc. approved fire alarm center may be reduced by an additional 25 percent.

(c) Prior to final approval of any subdivision or short subdivision, written verification by the water purveyor of actual fire flow, calculated in accordance with appendix B of the IFC, shall be provided to the fire marshal for review and approval.

(d) Prior to combustible construction of a single-family detached unit (SFDU) project the developer shall provide a final certificate of water availability indicating that all hydrants have been installed, charged and are operational. The hydrants shall provide a minimum 1,000 gpm for a 1-hour duration at 20 psi.

Exemptions: Except as provided in IFC section 507, the following permits and approvals are exempt from the water supply and fire hydrant requirements of this chapter:

(1) Subdivisions and short subdivisions in which all lots have a lot area of 43,560 square feet (one acre) or more in size;

(2) Building permits for structures classified by the building code as Group U occupancies (agricultural buildings, private garages; carports and sheds) that are restricted to private residential use only, provided that riding arenas or other agricultural type structures used or accessed by the public shall not be exempt;

(3) A building permit for a single family detached dwelling, duplex, or mobile home to be placed on a lot with a lot area of 43,560 square feet (one acre) or more in size; and

(4) Mobile home permits for mobile homes in established mobile home parks.