Now that you’ve recorded your home’s water capacity, let’s make sure your water meter and service line can handle it.  Complete the next steps determine your actual system design capacity. Flow Rates for Water Meters Meter Size          Max. GPM 5/8”                     10 3/4”                     15  1”                        25 Water Meter Size                              ______ = ______ Max. GPM Water meter size is stamped or printed on the face of the meter, or shown on your water bill Service Line Type/Size _________ = ______ Max. GPM  Type & Size Flow Rates for Service Lines and Sprinkler Lines Maximum Recommended Flow Pipe Type Pipe Size Maximum GPM PVC (Plastic)     Consider using 1″ Schedule 40 PVC pipe upstream of zone valves 1″ Schedule 40 13   3/4″ Schedule 40 7.9 and at least 3/4″ Class 200 PVC (SDR21) pipe downstream of zone valves 1″ Class 200 16.7   3/4″ Class 200 10.1 Galvanized 3/4″ Galvanized Pipe 8.3   1″ Galvanized Pipe 13.5 Copper(Service Line) 3/4″ Copper Tube 6.8   1″ Copper Tube 12.1 Polyethylene (Poly Pipe)     In freezing areas poly pipe may be used downstream of zone valves 3/4″ Poly Pipe 8 1″ Poly Pipe 13  Enter the Lower GPM From Steps 1 or 2 ______Max. GPM (this is your design capacity)  Example: Water Meter Size | Service Line Type/Size |Enter the Lower GPM 1” = 25 GPM | 1” Schedule 40 PVC = 13 GPM          13 GPM = design capacity Note:  It is recommended to use only 80% of the design capacity to allow for future household water consumption demand for domestic purposes