A new build is one of the easiest times to plan water treatment in St. Louis. Walls are open, pipes are exposed, and space for equipment can be set aside before anything is finished. Decisions made now are usually simpler to carry out than changes made after move-in. This guide walks through what to settle before the drywall goes up.
Start with the water source
Find out where the water comes from before you choose any equipment. Many homes in the City of St. Louis and inner suburbs connect to a municipal supply, while some outlying lots in St. Louis County and nearby counties rely on a private well. The source decides which tests matter and which equipment makes sense.
For a municipal connection, ask your water provider for its most recent annual water quality report. It lists what was detected in the treated water and what the provider monitors. Also ask whether the service line to your lot is a material the provider has records for. For a well, the water is your responsibility, so plan for a full test from a certified lab before you finalize the design.
Test before you design
A test result is the basis for every treatment choice. Ask the lab for a panel that covers hardness, pH, iron, manganese, chlorine or chloramine, sulfur odors, and total dissolved solids, plus anything the provider report or the lot's history suggests. If the lot is a well, add bacteria and nitrate testing. Keep the report in your building file so the plumber and any future buyer can see it.
Set pressure and flow targets
Ask the plumber to measure static pressure where the water enters the house, and at a high fixture if you plan one. Pressure that runs high can shorten the life of fixtures and appliances. Pressure that runs low can make some equipment work poorly. Treatment units also have flow limits, so the main line and the unit must be sized to match each other.
Reserve space and connections
Treatment equipment needs room, a drain, power, and access. Mark these on the plans before framing:
- A wall or floor area near the main water line, with clearance in front for filter changes and salt refills
- A floor drain or standpipe for backwash water
- A grounded outlet within reach of the unit
- A bypass valve arrangement so you can isolate the unit for service
- Space for bulk salt storage if a softener is planned
Choose the equipment type
Match the equipment to what the test found, not to a general idea of good water. Common options include:
- Softening, when hardness is the main concern for fixtures, dishwashers, and water heaters
- Sediment filtration, usually placed ahead of other equipment to protect it
- Carbon filtration, when chlorine, chloramine, or taste and odor are the goal
- Disinfection, such as UV, for a well with bacteria concerns
- Point-of-use treatment at a kitchen tap, when only drinking water needs attention
Get responsibilities in writing
New builds involve several trades, and water equipment can fall between them. Before work starts, confirm in writing who selects and installs the treatment equipment, who makes the electrical and drain connections, who handles permits, and who runs the startup test. Ask the builder whether the water plan is part of the contract or a separate item. Keep the plan with the rest of the project file.
Check permits and inspections
Plumbing and electrical work for water equipment often requires permits and inspections in the City of St. Louis and St. Louis County. Confirm with the local building department which items need an inspection before the walls close. A rough-in inspection is the last easy chance to fix a poorly placed drain or valve.
Plan the first test after move-in
Once the equipment is running, test the treated water and compare the results with your pre-build report. Test again after the system has had time to settle, then keep a record. Write down the date of each test, the readings, and any changes you make. A simple log makes the next decision easier.
Questions to bring to the builder
- Where does the water service line come from, and do you have records of its material?
- Where will the treatment equipment sit, and is there a drain nearby?
- Who is responsible for the permit and the rough-in inspection?
- Will the plumber measure pressure and document it?
- Who runs the startup test, and who receives the results?
Keep it simple
A practical St. Louis water plan starts with a test, a clear place for equipment, and a written record of who does what. You do not need every answer on day one. You do need the space and connections in place before the walls close.