The installer has finished working, the water is back on and a completion form is waiting for your signature. Before you sign it, compare the paperwork with the equipment and the original agreement. A completion form may be used to show that the installation was accepted, training was provided or the job was finished. If something is missing, damaged or untested, write that down before the form leaves your hands.
You do not need to turn the final walkthrough into a technical inspection. You do need a clear record of what was installed, what was demonstrated and what the provider still owes. That record becomes especially useful if a leak appears, a promised feature is absent or a future service technician needs to know how the system was set up.
Bring the signed quote to the walkthrough
Start with the quote, contract or work order you approved. Match each listed item to the finished job. Check the equipment type, tank count, faucet, filter housings, storage tank, bypass assembly, drain connection and any included accessories. If the paperwork identifies model numbers or equipment capacities, compare those details with the labels on the installed units.
Also look for work that may be easy to overlook. The agreement might include removal of old equipment, disposal, plumbing corrections, a water test, startup supplies or instructions for another appliance. Do not rely on memory when the written scope is available.
If the installer substituted an item, ask for the substitution to be identified on the final paperwork. The record should say what was actually installed. A handwritten correction that both sides acknowledge is more useful than a completion form that repeats equipment no longer in the house.
Separate installed from tested
An installed component is not necessarily a tested component. Ask the installer to operate the system while you watch. Run treated water at the appropriate faucets. Check connections, housings and drain lines for visible leaks. If the system has a bypass, ask the installer to show its normal operating position and how to place it in bypass.
For a softener or other backwashing unit, ask what startup cycle was completed and where the discharge was observed. For a reverse osmosis system, ask whether the tank has filled enough to perform the final checks or whether another flush is required after the visit. For ultraviolet equipment, confirm that the lamp, controller and any alarm are operating as the written instructions describe.
Some results cannot be confirmed during a short final visit. A storage tank may still be filling, treated water may need additional flushing or a follow-up sample may be part of the agreement. Put those open items on the form with the next action and the person responsible for it.
Record the starting settings
Ask the installer to write down the settings that matter for future service. Depending on the system, these may include hardness input, regeneration schedule, reserve setting, filter change interval, alarm setting or pressure setting. You are not trying to judge every setting at the door. You are creating a starting point that can be compared with later performance.
If settings are stored electronically, take a clear photo of the relevant display or ask for a printed setup record. A future technician should not have to guess whether a value changed after installation.
For equipment that uses replaceable filters, lamps, treatment media or other supplies, identify the exact replacement item. A statement such as filter included is not enough to help you order the next one. Ask for the part number, size or other identifying information used by the provider.
Write a specific punch list
If the job is not fully complete, avoid vague notes such as needs attention. Describe the exact condition. Useful entries might say that a wall opening remains unsealed, a drain tube needs additional support, the promised faucet finish does not match or the old equipment has not been removed.
For each item, include who will handle it and what must happen before it is considered complete. If a return visit is required, ask how it will be scheduled. If a part must be ordered, identify the part. If you and the provider disagree about whether an item was included, note the disagreement rather than signing a statement that says everything is complete.
Do not let a verbal promise replace the written punch list. The installer who made the promise may not be the person who handles the return visit. A specific note gives the office something it can assign and verify.
Read the statements above the signature
Completion forms do not all say the same thing. Read the language directly above and below the signature line. Look for statements saying that the work was completed to your satisfaction, the equipment was received in good condition, operating instructions were provided or no further work is due.
If one of those statements is not accurate, ask for it to be corrected or qualified. You can request that an unresolved item be written on the form before signing. Do not assume that a separate text message or verbal conversation automatically changes what the form says.
Also check whether the document authorizes payment, confirms financing work or acknowledges delivery of warranty materials. Those are separate facts. Confirm each one rather than treating the signature as a ceremonial last step.
Collect the handoff documents
Before the installer leaves, gather the documents needed to operate and service the system. These may include the final invoice, equipment manual, warranty terms, model and serial numbers, water test results, filter information and contact instructions for service.
Check that the warranty identifies the covered equipment and explains any registration or maintenance requirements. If the provider offers its own labor coverage in addition to a manufacturer warranty, ask for the provider coverage in writing. A brochure for the equipment does not necessarily document the installer's obligations.
Keep your copy of the completion form, including every handwritten note. Photograph it if the provider takes the original. Store it with the quote, change orders, invoice and warranty information so the documents describe one complete job.
Know what a useful final record looks like
A useful completion record answers basic questions without requiring anyone to reconstruct the visit. It identifies the equipment actually installed, the work that was tested, the initial settings, the documents delivered and any remaining tasks. It also shows who acknowledged the open items.
If the system is working and the paperwork matches the job, signing the form can close the installation cleanly. If the work is incomplete, the goal is not to refuse every signature. The goal is to make the form accurate before you sign it. That small pause gives you and the provider the same written list of what happened and what must happen next.