If you’re have a plumbing project in mind? If so, it’s important you use a certified plumber to take on the job. Choosing someone purely because of a low price on offer, could turn out to be a big mistake. A certified plumber will have done the necessary courses that allow them to get their certification, and agree to offer work of an expected standard. If you need a plumber, you should seek personal references from family and friends. But in the absence of a personal reference, then check your local online review sites to see reviews from ex-customers from the plumbers you are considering hiring.