All you have to do is to open some powerful search engine like Google, Yahoo or MSN and type the keyword such as plumbers plus the locality where you are living. Once this is done, the search engines will give a list of hundreds of such people in your locality and nearby areas. You can pick and choose a few of them and contact them over phone or email. Based on the response and replies, you can choose a few plumbers and after personally verifying their credentials and expertise, you can choose a few who would be able to do the job for you according to your requirements and satisfaction.