Quick answer: Reduced sprinkler throw can come from lower zone pressure, clogged nozzles or screens, a partially opening valve, an underground leak, damaged heads, or increased flow demand on the zone. The pattern across the zone helps identify the likely cause.
One weak head versus an entire weak zone
If one sprinkler has shortened throw while neighboring heads look normal, inspect that head, nozzle and filter first. If every head is weaker, investigate the valve, piping and available pressure.
Common causes
- Clogged nozzle or internal screen
- Damaged sprinkler body
- Underground pipe or fitting leak
- Valve not opening completely
- Nozzles with more combined flow than the zone can support
Do not solve a pressure problem with extra runtime
Running the zone longer does not restore sprinkler throw. It may simply overwater areas that still receive adequate coverage.
See why one sprinkler zone has low pressure or our sprinkler repair service.
