Skip to main content

Residential Fire Sprinkler Systems

RESIDENTIAL FIRE SYSTEM REQUIREMENTS

San Juan Water District standards require that all new residential fire sprinkler systems within its service area are to be based on a Modified Passive Purge (MPP) design.  An MPP system involves designing the fire system piping to the following minimum standards:.

  • All toilets shall be supplied from the fire sprinkler system piping.
  • There shall not be any dead-end loops or zones in the fire system piping layout.  Water must adequately circulate throughout the fire system piping.
  • There shall not be any dead-end arm-overs or horizontal or vertical pipes longer than 36.0-inches.
  • Water system pressures shall be provided to the designer by SJWD’s Engineering Department.  No third party provided pressures will be allowed.
  • All residential fire sprinkler systems shall be approved by SJWD and the Jurisdictional Fire Entity/Agency.
  • Copies of the Jurisdictional Fire Agency’s approved inspection and testing reports shall be submitted to SJWD prior to a water service activation.

Without a fire sprinkler system being designed, constructed, inspected and approved as a MPP, then SJWD may opt to require a retrofit of the system to meet the MPP requirements.  If a residential fire sprinkler system cannot qualify as a MPP, then SJWD shall require a backflow prevention device to be installed on the water service just downstream of the water meter before a service will be activated or re-activated.  Any service that does not meet these requirements is subject to a shut-down lockout until such time as these requirements are met.  More information on this topic can be found here: 

SJWD - Residential Fire Sprinkler Design Requirements

 

DESIGN PROCEDURES

There are two methods of designing residential fire sprinkler systems in SJWD’s service area.

Method A – Design Based on a Standardized Pressure.

Typically this methodology is used when the fire system can be based on a standard pressure of either 35-psi or 45-psi (based on the site specific location within SJWD’s service area).  The process involves contacting SJWD’s Engineering Department and requesting a “Standard Pressure” for a given parcel or location.  There is no fee associated with this methodology for obtaining a standard pressure value from SJWD.  A copy of the design procedure for this methodology can be referenced here:

SJWD - Residential Fire Sprinkler Standard Pressure Design Procedure

 

Method B – Design Based on a Flow and Pressure Analysis.

Typically this methodology is used when a site specific pressure is needed to complete a fire sprinkler system design, such as for a larger custom home or where there are unusual site conditions or other constraints.  This design method begins with contacting SJWD and requesting a site specific Flow and Pressure analysis.  An application for a flow and pressure analysis is submitted to SJWD along with a fee payment for this service.  The current fee for this service can be found on SJWD’s current fee schedule.  A copy of the design procedure for this methodology can be referenced below.  A copy of the “Application for Flow and/or Pressure Analysis” form can be referenced here:

SJWD - Residential Fire Service Design ProcedureSJWD - Application for Flow or Pressure Analysis

 

JURISDICTIONAL FIRE AGENCIES

There are four fire entities/agencies having jurisdiction within SJWD’s service area.

  • South Placer Fire District
  • City of Roseville Fire Department
  • City of Folsom Fire Department
  • Sacramento Metropolitan Fire Department

 

QUESTIONS

Should you have any questions or need further information please do not hesitate to contact SJWD’s Engineering Department.