Water treatment work often touches supply plumbing, drain lines, electrical outlets, and sometimes the water heater connections. A mistake in any of those areas can cost more to fix than the original job. Confirming who is qualified and insured is one of the simplest steps you can take before a visit, and it takes a few minutes by phone or email.
What to ask for
Ask which licenses the company holds and whether your city or county requires a plumbing or other trade license for the specific work in your quote. Local rules differ, so check with your local building office for what applies at your address. Ask for a certificate of insurance that names the company, not only a business card that says insured. A certificate you can read is better than a verbal assurance.
Confirm the person who arrives
Ask who will do the work. Some companies send their own employees, and some send subcontractors. Neither is automatically a problem, but you should know which one is coming. Ask for the technician's name in advance, and check that name against the license or the company's list when they arrive. If the person at your door is not the person you were told about, pause the work until the company explains the change in writing.
Paperwork that should match
The company name on the quote, the invoice, the warranty, and the insurance certificate should all match. If they do not, ask why before work begins. A warranty issued by one entity and a service visit performed by another can leave you without a clear party to call later. Ask who pulls any required permits, and get that answer on the quote itself.
If the answers are vague
A vague answer about licensing or insurance is not a reason to panic, but it is a reason to stop and get specifics. Ask the same questions of another provider and compare the answers. Our review methodology explains how we check these items when we rate a provider, and it can help you decide which of the questions matter most for your job.