If you rent a house in O'Fallon that runs on a private well, the water system often falls somewhere between the landlord's responsibility and your own daily routine. Lease language is not always clear, and water problems tend to show up at inconvenient times. This guide lays out who usually handles what, what to ask before you sign, and what to record if something goes wrong.
Start With the Lease and the Records
Before you move in, ask the landlord or property manager for any water-related paperwork they have. Useful items include the most recent water test results, a description of the well and pump, records of repairs to the pump, pressure tank, or treatment equipment, and the date of the last service visit. If the house has a softener, filter, or UV lamp, ask who installed it, who maintains it, and whether the manual is still in the home.
Check the lease for a section on utilities, repairs, and maintenance. Many leases say the landlord must keep the water supply working, but they may not define what that means for a private well. Ask directly whether the landlord covers pump repairs, pressure tank replacement, well cap repairs, and filter cartridges. Get the answers in writing, even if it is a short email.
Know Which Tasks Belong to Whom
Responsibilities in rental homes vary, but a common split looks like this:
- Landlord: well structure, pump, pressure tank, pressure switch, major treatment equipment, and periodic water testing.
- Tenant: routine cartridge changes if the lease assigns them, reporting changes in taste, color, odor, or pressure, and keeping access open for service visits.
- Shared: salt refills for a softener, cleaning filter housings, and confirming that the house has water during a power outage.
Treat this list as a starting point, not a legal answer. The lease governs. If the lease is silent, put your questions in writing and keep a copy.
Testing in an Unfamiliar Home
A private well can change over time, even when the house looks the same. Shallow wells near row-crop fields or septic systems can carry nitrates, and shallow or poorly sealed wells can show coliform bacteria. Deep bedrock wells can contain naturally occurring radium, gross alpha, or uranium. Iron, manganese, and sulfur bacteria are common in many wells in the area, and they often appear as staining, slime, or a rotten-egg smell. You cannot tell which of these you have by looking at the water.
Ask whether the landlord has tested the well for these substances, and when. If the most recent test is old, or none exists, you can request testing. Coliform and E. coli testing is available through the Missouri State Public Health Lab, which offers free or low-cost options. Follow the lab's instructions on sample bottles, collection method, and hold times, because a sample collected incorrectly can give a misleading answer.
Document Problems as They Happen
Write down what you notice and when. A simple log helps the landlord, a technician, or a lab understand the pattern. Record:
- The date and time you noticed the problem.
- What you saw, tasted, or smelled, and whether it affected hot water, cold water, or both.
- Whether the problem followed a storm, a power outage, heavy rain, or a change in the house.
- Any steps you took, such as running a tap or changing a cartridge.
- Photos of stains, sediment, or fixtures, taken in good light.
Send reports in writing so there is a record. Describe the problem plainly and avoid guessing at the cause.
When Pressure Drops or Water Stops
If water pressure falls or the house runs out of water, check the basics first. Look at the breaker for the pump, see whether neighboring homes are affected, and confirm that the power is on. Do not open or adjust the pressure tank or well equipment yourself unless the lease allows it and you know what you are doing. Report the problem right away, since a pump that runs dry or cycles repeatedly can be damaged. Ask the landlord who to call after hours.
Leaving the Home
When your lease ends, note the condition of any treatment equipment and take photos of the filter housings and softener. Ask the landlord to confirm in writing that the well was in working order when you left. Keep your move-out records with your lease and any water reports you received.
Where to Get Help
For questions about your rights as a tenant in Missouri, a local tenant resource or legal aid office can explain the rules that apply. For questions about the water itself, a state-certified lab can run the tests, and a qualified service technician can inspect equipment. Bring your log, your lease, and any test results to every conversation.