Humming in water pipes
We had a Toro irrigation system professionally installed 5 years ago. The last several summers we are experiencing a loud "humming" in our water pipes when the water is on anywhere in our house. This only happens in the spring and summer, when our irrigation system has been activated. After we do a fall shut-down it disappears. This summer it is specially bad. When our irrigation company came out for our backflow test the tech told me he thinks our presure regulator was the problem, and to call a plumber. Should I call a plumber or my irrigation co? Is there anything I can do, before I spend $$$$ calling a professional. Many thanks for any help and advice you could give!