Most water treatment installs involve plumbing work: cutting into supply lines, adding a bypass, mounting a tank, or connecting a drain. Depending on where your home is and what the work touches, some of that work may require a permit and an inspection. Whether it does is a local question, and the provider should be able to answer it before any work is scheduled.

What to ask in the first conversation

Ask these three questions directly and write down the answers:

  • Does this specific install need a permit where my home is located?
  • Who applies for the permit, the company or me, and who pays the fee?
  • Who schedules the inspection, and will the inspector see the bypass and drain connections before the walls are closed up?

A clear answer to each one is a good sign. A vague answer, or a claim that no permit is ever needed, tells you the provider has not checked for your situation.

Verify the license instead of just reading it

Ask for the license number and the name printed on the license. Then check both with the licensing authority that covers the jurisdiction where the home sits. Confirm that the licensed name matches the company on your contract. If one person holds the license while a different company sends the crew and invoices you, ask how that arrangement works and who is accountable for the work. Requirements differ from one city or county to another, so do not assume a license from elsewhere carries over.

Check insurance and who is named

Ask for a current certificate of liability insurance. Check that the company name on the certificate matches the company on your contract, and ask whether the certificate can list you as the certificate holder. If a crew damages a wall, a floor or a fixture, the certificate shows which policy would respond. Ask in writing what the policy covers and what it excludes.

Put the paperwork into the written scope

Permit, inspection and cleanup responsibilities should be written into the scope of work, not left to memory. Note which party pays any permit fee and whether the quoted price already includes it. Ask when the inspection is expected and what happens if it fails. Keep copies of the permit, the inspection result and the insurance certificate with your other service records. A future buyer, an insurer or a repair technician may ask to see them.

Red flags

  • The provider says no permit is needed without asking about your location or the exact work involved.
  • The provider will not give a license number or insurance certificate before you sign.
  • The provider suggests skipping the inspection to finish sooner.
  • The permit fee is requested in cash with no receipt.
  • The crew arrives under a different company name than the one on the contract.

If any of these come up, stop and resolve them before the install is scheduled. Fixing a missing permit after the walls are closed costs far more than asking the question at the start.

For how we weigh documentation and licensing when we evaluate providers, see our review methodology.