Concern regarding water hammer noise from sprinkler system and washing machine when they are used. I found the pressure to be 105 psi in the home which is more than the 80 psi allowed per code. I installed a pressure reduction valve on the water main, a new water main valve. I also installed washing machine hammer arrestors as they are also required by code. I ran both the washing machine and irrigation system and did not hear the noise anymore. I flushed the water heater and checked the anode rod. Anode rod was gone which we replaced. Flushed faucets and asked if the pressure was sufficient, and explained how to adjust it higher if he changed his mind.