HomeMy WebLinkAboutWater Supply SpreadsheetResidential Water Supply Requirements
Chatham County
Cumberland County
Johnston County
Lee County
Harnett County
Moore County
Sampson County
Wake County
Angier
Coats
Dunn
Erwin
Lillington
* AHJ has no specific distance requirement. NC Fire Code, 507.5.1 requires a maximum distance of 600' from residential structure.
** Refer to ISO tab for exposure adjustments
Minimu Commercial Fire Flow Requirements
Maximum Distance to Residence
* 600'
* 600'
No info available online. Waiting for response from county official.
500'
* 600'
* 600'
* 600'
500'
450'
250'
No info available online. Waiting for response from town official.
500'
Minimum GPM
500 GPM
1000 GPM
500 GPM
500 GPM
500 GPM
1000 GPM
500 GPM
500 GPM
1,000 GPM
1,000 GPM
1,500 GPM
1,000 GPM
Minimum PSI
20 PSI
20 PSI
20 PSI
20 PSI
20 PSI
20 PSI
20 PSI
20 PSI
25 PSI
20 PSI
20 PSI
20 PSI
MinimumDuration
1 hour
1 hour
NA
NA
1 hour
1 hour
1 hour
2 hours
3 hours
Calculation Method
**ISO
Appendix B
NA
NA
**ISO
Appendix B
**ISO
Appendix B
ISO
Notes
GPM's increase for exposures less than 30'
If improvements <1,500' or 50' per lot, which ever is greater
As an alternative materials and method, the building may be protected throughout by an approved automatic sprinkler system, if the minimum flows are not available.
Wake uses ISO for commerical properties. Waiting on response from WC to confirm they are using ISO for residential.
Per NC Fire Code
Additional water main size requirements.
NC Fire Prevention Code, 2018 Ed.
507.3 Fire flow. Fire flow requirements for buildings or portions
of buildings and facilities shall be determined by the
ISO Fire Suppression Rating Schedule, NFPA 1142 or other
approved method.
507.5.1 Where required. Where a portion of the facility
or building hereafter constructed or moved into or within
the jurisdiction is more than 400 feet (122 m) from a
hydrant on a fire apparatus access road, as measured by an
approved route around the exterior of the facility or building,
on-site fire hydrants and mains shall be provided
where required by the fire code official.
Exceptions:
1. For Group R-3 and Group U occupancies, the
distance requirement shall be 600 feet (183 m).
NC Fire Prevention Code, Appendix B
Commercial
Minimum criteria
For your community to be eligible for a PPC of Class 8 or better, your water supply system must be able to deliver at least 250 gpm for a period of 2 hours. That flow is in addition
to the community’s maximum daily rate of consumption for purposes other than firefighting.