There are several ways to choose a plumber:
1. A referral from a friend or family member.
2. Phone book.
3. Internet.
4. Local chamber of commerce.
Before you choose one, be sure to check a few things first;
Check the license and insurance of the plumbing company you are considering.
Choose a company that has been, and will be around for a long time.
Choose a company that will stand behind their work.
Pick a company that will put their quote's and work completed in writing.
Ask them for references.
Choose a company that has been recognized by their city, local chamber of commerce, or trade organization.