Wes Scantlin continues to piss off his neighbors and police ... after a cop responding to a flood was injured on his property and ended up in the hospital.
Law enforcement tells TMZ ... neighbors of the Puddle of Mudd lead singer called police Wednesday after they saw water pouring down his driveway.
When cops came ... they discovered the pool water running -- it had been running for DAYS -- a bonehead move in the middle of the severe drought.
Cops became alarmed because the doors of the house were wide open and they feared someone might be inside either injured or dead. One officer climbed an outside staircase to get in the house and fell through the rotted wood.
The officer was taken by ambulance to the ER but did not suffer serious injuries.
Wes -- who doesn't live at the house -- eventually showed up. Cops told him his ongoing war with his neighbors had to stop. The singer was arrested last August for taking a buzz saw to a neighbor's house.
In the end, no charges were filed and everyone went their separate ways, so ... water under the bridge.