1. Is the soil beneath the brown spot actually dry?
Push a long screwdriver into the brown area, then try nearby green grass. Check more than one spot so a rock or compacted patch does not mislead you.
You are looking for a noticeable difference, not an exact measurement.
If the brown area is drier
The area may be receiving less water. Run the sprinkler zone and watch whether spray reaches it before changing the watering schedule.
If the soil is already moist
Do not add more watering. Roots, insects, disease, compaction, heat, or drainage can create similar brown patches.
Not sure whether the difference is meaningful?Schedule a coverage check
2. Does sprinkler water reach the brown area?
Run the affected zone during daylight and watch the heads around the brown patch. Look for one that stays low, stops turning, points away, sprays into tall grass, or falls short.
The shape of the brown area can show you where to start watching, but it cannot identify the failed part by itself.
Want someone to inspect the pattern while the system runs?Schedule a coverage check
3. Is there an obvious problem you can safely correct?
Start with what you can see. Make one change, then run the entire zone again before changing anything else.
Clear the spray path
Trim grass or plants that block an otherwise intact head from rising or spraying.
Check the sprinkler head
Note whether it is buried, leaning, cracked, stalled, or pointed away. Stop if the body moves at the base or water bubbles from below.
Watch where the water goes
Look for spray on pavement, water running downhill, pooling, or a stream that never reaches the brown area.
If several heads look different, the cause may not be visible from above ground.Schedule a coverage check
What should you do after you find a coverage gap?
If grass or plants were blocking an intact head, clear them and run the whole zone again. A small direction adjustment can be reasonable when the head is stable and you have instructions for that model.
Do not choose a replacement head or nozzle because it happens to fit. The part also has to match the zone’s spray pattern, distance, and water use. A change that helps one spot can leave another area too wet or too dry.
Schedule sprinkler service when the spot returns, several heads are weak, water appears below grade, or you cannot tell whether the cause is pressure, spacing, supply, or a component.
FAQ
Common questions
That area may receive less water because a head is blocked, tilted, buried, stalled, or unable to reach it. Soil, roots, heat, insects, and disease can create similar symptoms.
Only when the area is dry because the whole zone needs more water. Longer runtime cannot correct uneven coverage and may overwater the rest of the zone.
Use it when the soil is dry but the cause is not obvious while the zone runs. Different amounts across matching containers confirm uneven delivery, not the failed part.