When a private well in the St. Louis area stops delivering water, turns cloudy, or starts to smell, you will usually need one of three professionals: a well driller, a pump technician, or a water treatment company. Each one works on a different part of the system. Calling the right one first saves time and keeps you from paying for work the problem does not need.

Start With the Symptom

Most well problems point to one part of the system. Pay attention to what you notice before you pick up the phone.

  • No water, sputtering faucets, or pressure that drops during use usually points to the pump, the pressure tank, the pressure switch, or the wiring that connects them.
  • Sand, grit, or sudden cloudiness, especially after a storm, may point to the well structure itself, such as a damaged cap, a cracked casing, or a failed screen.
  • Stains, odor, or a taste that stays the same no matter how the pump runs is a water quality question. It needs a lab result before anyone recommends equipment.

What Each Professional Does

The Well Driller

A licensed well driller drills new wells, repairs damaged casing, seals old or abandoned wells, and inspects the well structure when something looks wrong at the top of the well. Call a driller when you suspect the well itself has been damaged or when a well is being taken out of service. Missouri licenses well drillers and pump installers, so ask for proof of licensing and confirm it with the state before any work starts. Ask for a written record of the work and keep it with your other well documents.

The Pump Technician

A pump technician handles the equipment that moves water from the well into your house. That includes the submersible pump, the drop pipe, the pressure tank, the pressure switch, and the electrical controls. If your pump cycles on and off too quickly, runs constantly, or stops altogether, a pump technician is usually the first call. A pressure tank that has lost its air charge is a common cause of rapid cycling, and a technician can check it in a short visit. Pulling a pump from a deep well takes specialized equipment, so ask whether the company does its own pulls or hands that work to someone else.

The Water Treatment Company

A water treatment company tests water, recommends treatment, and installs and services equipment such as filters, softeners, and disinfection systems. This is the right call once you know what is in the water. Be careful about starting here, though. A company that sells equipment has a stake in the diagnosis, so get an independent lab report first. Ask the company to explain the results in writing and to tell you plainly what the equipment will and will not remove.

Test First, Then Call

Before you hire anyone to treat the water, collect a sample and send it to a state-certified laboratory. Labs serving the St. Louis area can give you sampling instructions, and local health departments can often point you to certified labs. A common starting panel covers bacteria, nitrate, and several metals, and you can add tests based on what you notice. Follow the lab's collection steps exactly, because a sample taken the wrong way can give misleading results. If bacteria show up in the report, stop using the water for drinking until a plan is in place, and ask your driller or treatment provider how they will handle it.

Local Factors That Shape the Call

Much of the St. Louis area sits over limestone and dolomite bedrock, and the soil cover above it varies from one lot to the next. In some places, surface water can move down into groundwater quickly through cracks and sinkholes in the bedrock, so a well that looks fine in one season can change after heavy rain. Homes near the Missouri, Mississippi, and Meramec rivers can also see flooding that reaches the wellhead, the pump house, or the electrical controls. If you see standing water around the well, have a driller check the well cap and surface seal before anyone assumes the problem is in the treatment equipment.

Questions to Ask Before You Hire

  • Are you licensed for this type of work, and can you show me your license?
  • Will you give me a written estimate that lists parts and labor separately?
  • Will you explain what you found and show me any part you replaced?
  • If the problem is water quality, will you work from an independent lab report?
  • Who will do the work, and who do I call if something goes wrong afterward?

Keep the Records

Store the driller's well log, pump service notes, and lab reports together in one place. A complete file makes the next call faster, lets any technician see what has already been tried, and helps a future buyer understand the history of the water supply. Start the file now, even if the current problem seems small.

In short, call a driller when the well structure may be damaged, call a pump technician when the flow or pressure is the issue, and call a water treatment company after you have a lab result that shows what needs treating.