Ask around. Ask your friends, ask your neighbors and get referrals. Nothing is more powerful than the testament of someone who has had a local plumber in their home and can speak to his/her capabilities.
Do independent research using the Yellow pages, search engines and local business listings. Beforehand, make a list of what you are seeking in a plumber on Long Island. For example, years of experience, what services they provide, whether or not they have emergency service, areas of expertise, types of jobs they perform (residential, commercial, industrial) etc. Look for local plumbing service companies that are a match.
Certified. Just like any other professional, a plumber comes with a certification. Make sure that you hire someone that is fully certified as a clog specialist. Never assume that all plumbing companies that offer these types of services come with a certification. Do your research.
For this reason it is highly important to make sure you are prepared in a plumbing emergency. The first thing to do then is to make sure that you already have the number of a plumber in your phone book that you can find immediately. The sooner the emergency Trustworthy plumber gets there, the less damage you'll do and the less water you'll waste. Meanwhile you will be more likely to be successful in having your plumbing repaired. Don't make yourself rummage around to try and find the number of a plumber at the last minute - keep it somewhere where you can retrieve it easily when necessary.
But for more complicated issues and damages on your water system, hiring a Local plumber or contractor is the only way to go. Although, not all home insurance cover such repairs, getting the job done through the assistance of a Local plumber can greatly save you the trouble. Besides, most of these local plumbing contractors offer warranty on their work so if the issue persists, you can easily call them back to recheck the situation.
Why do that? Because a higher ranking tells your potential customers that you are a more relevant result for their search than the ones below it. That means that they are more likely to click on, look at, or simply walk to your map result than to your competitors'. If you slip off the first page of rankings in maps, that makes a huge difference to the amount of traffic your site receives.
Once the work has been completed, ask for a breakdown of the bill before it's paid. That way, you know what you're paying for and it stops the plumbers asking for more money down the line.