Why is submersible water pump making noise in running?

The reason may caused a submersible water pump running with noise as following:

1. The pump house is loose: Check whether the pump is firmly installed and re-fix the pump if necessary.

2. Bearing wear: Check whether the bearings are worn and replace them if necessary.

3. Impeller wear: Check the impeller if wear and replace it if necessary.

4. Lower water intake into the centirfugal pump: Check whether the water inlet is blocked and clear the blockage in the water inlet.