Well System Startup: Water Floods from 4" Pipe—Wrong Valve Opened

First-Time Well System Startup: Opened Drain Valve Instead of Supply

First attempt to turn on sprinklers. Turned a key-operated valve near well. Spitting at heads, but 4" PVC pipe pours water. Can't shut it off. Sand filter nearby.

Diagnosis: Opened a Drain/Bypass Valve

The 4" pipe is likely a winterization drain or bypass line. The valve you opened may be for that, not the sprinkler supply.

Action

1. Look for other valves near the well/pump/filter that isolate the sprinkler mainline.
2. Close the valve you opened (if possible).
3. Find a neighbor with a similar system or hire a local pro—every well system is unique.

No universal startup sequence exists for custom well systems.