I had one lot just come and take my hose - my water - and start to wash off the drive etc. I told them to "p*ss" off and took my hose back. I've had my auto system stuffed by "cowboys" who don't give a stuff.
I found one guy walking around my house - asked him what he was doing. He said he was looking for my tap so he could hook his hose up.
It's NOT the water/cost - it's the lack of manners/courtesy shown. A simple knock on the door.
When any damage occurs - of course its not their fault. Had my side fence dented and they claimed I must have done it. Dent came my way ... When I pointed this out he acted like I was Sherlock or Poirot.
They generally get annoyed when caught out - or abusive.