You need to do a regular maintenance check on your irrigation system. If your sprinklers aren't kept in great condition, they could be wasting water as well as having detrimental effects on your lawn!

Sprinkler Maintenance Checklist:
Once a month, turn on each valve of your irrigation system during daylight hours and perform an inspection. Some automatic timers allow you to set a test run, or you can program each station to come on successively for one minute. Check the following:

GENERAL MAINTENANCE:
-Is any water being sprayed on the street or sidewalk?
-Are there obstructions preventing the water from reaching the desired areas?
-Are there any observable leaks or breaks in the pipe?

SPRINKLER HEADS:
Are any heads…
-missing?
-broken?
-clogged?
-pushed too far into the ground?
-tilted or spraying in the wrong direction?

PRESSURE:
Is the pressure…
-too low?(spray is not reaching all desired areas, spray is forming large water droplets, there are doughnut shaped dry areas, rotor speed is too slow, rotors are not rotating).
-too high? (spray is overshooting desired areas, spray is misting and there are dry areas between heads, rotor speed is too fast, rotors are not rotating, heads are leaking).