What causes sprinkler heads to leak after shutdown?

Common reasons

If sprinkler heads keep dripping after the system shuts off, the issue is usually tied to trapped water or a failing component. Common causes include:

• Low-lying heads that drain water from higher parts of the line
• Worn seals or diaphragms inside the valve
• Debris preventing the valve from fully closing
• Cracked fittings or heads that allow water to escape
• Excess pressure in the line

Why it matters

Ongoing dripping can waste water, create soggy spots, and leave mulch or soil washed out around plant beds. In Dallas, that can also make it harder to keep irrigation working efficiently during hot, dry weather.

What to do next

Start by checking whether the leak happens at one head or several. If the problem continues, the valve or line may need professional attention. Dallas Landscape & Irrigation can inspect the system, identify the source, and make the needed repair. Request an estimate to get started.