[jstewartmobile]

I don't know about "good," but it's always money well spent to get a test kit from the home store (Home Depot and Lowes both sell them for $20-$30). Sometimes you can have an issue caused by your home that has nothing to do with the public supply.

Knew one person who found out his sewage pipes were somehow mingling with his fresh water ones this way. How that even happens, I do not know...