For most residential sprinkler systems, 40 to 60 PSI is the usual safe range for a blowout, and many tech guides point to about 50 PSI as a practical target. Some systems can tolerate a bit more, but going too high can damage heads, fittings, or pipe joints.

Quick answer

  • PVC systems: often around 50 to 60 PSI.
  • Polyethylene systems: often around 50 PSI , sometimes a bit higher depending on the setup.
  • Drip or micro systems: usually lower, around 30 to 40 PSI.
  • Avoid exceeding about 80 PSI unless a manufacturer specifically says it is safe for your system.

Practical tip

If you are doing it yourself, start low and increase only as needed while watching the pressure gauge. The goal is to clear the lines, not to “blast” them.

Safety note

If you are unsure about your pipe material, zone size, or compressor setup, it is safer to use a professional or check the irrigation manufacturer’s guidance first.

If you want, I can also give you the right compressor CFM for your sprinkler system size.