Many people in St. Louis rent, and a lot of rentals in the older neighborhoods have kitchens that were never designed for extra water equipment. If you are thinking about adding an under-sink filter, the sink is only part of the question. The other part is who owns the plumbing, what the lease says, and what happens when you move out. Sort those out first and the installation itself is usually the easy part.
Start with your lease
Read the lease for any language about alterations, fixtures, or appliances. Many leases say tenants may not change plumbing without written permission. Under-sink equipment often involves a new faucet, a drilled hole in the countertop or sink, or a connection to the cold water line, so it can count as a change even when it looks small. If the lease is silent, ask anyway. A short written message to your landlord or property manager is better than a verbal okay you cannot prove later.
Write down what you are asking for
Your request should name the exact work. Include the kind of equipment, whether a new faucet will be installed, whether anything will be drilled, where the water line will connect, and whether the existing faucet will be kept. Asking the landlord to keep the original faucet is a useful option, since it makes it easier to restore the kitchen when you leave. Ask whether the landlord wants a licensed plumber to do the work or whether a tenant may do it. Keep the reply in your records.
Document the sink before you touch anything
Take clear photos of the sink, faucet, cabinet floor, and the shutoff valves before any work starts. Note any stains, soft spots, slow drains, or drips that already exist. This record protects both sides. If a leak shows up later, you can show that the cabinet was already damp or that a fitting was already worn. Store the photos with your lease and your move-in paperwork.
Ask who is responsible for leaks
Before work begins, settle who pays if a connection fails. Under many leases, the landlord covers the building's plumbing while the tenant covers damage caused by equipment the tenant added. Check that your renter's insurance covers water damage and that the policy does not exclude it. If you are unsure how a St. Louis lease handles this, ask the landlord to put the answer in writing or contact your local housing office for guidance on tenant rights in your part of the area. St. Louis City and St. Louis County have different offices and rules, so confirm which one applies to your address.
Plan the removal before you install
Ask yourself how the kitchen will look when you move out. If you add a new faucet, plan to keep the old one in a dry, labeled box. Note which fittings you added and which were already there. Before you leave, you may need to remove the filter, cap the line, and reinstall the original faucet. Do this with the landlord's knowledge so no one is surprised by a missing part or a patched hole.
Check the water shutoff first
Before any work, find the shutoff valve for that sink and test that it turns. A stiff valve that does not close fully can turn a small job into a flood. If the valve is hard to reach or does not work, tell the landlord now. A property owner who fixes a valve before work starts is far easier to deal with than one who learns about it after a leak.
What to do first
- Read the lease for alteration and appliance language.
- Send a written request that names the exact work and asks about keeping the original faucet.
- Photograph the sink, cabinet, and shutoff valves before anything changes.
- Confirm who pays for leaks and check your renter's insurance.
- Plan the removal steps and store the original parts.
Renting does not rule out better water in your kitchen, but it does mean the paperwork matters as much as the plumbing. A clear written agreement with your landlord keeps the project simple for both of you, and a careful record keeps it fair when you leave St. Louis or move to a new unit.