If someone has repaired, replaced, or worked on the well pump, pressure tank, or the pipes between the well and the house, the water deserves a fresh look before anyone drinks it. In Arnold, many homes rely on private wells, and repair work can change what comes out of the tap for a while. This guide walks through what to do next.

Start with what was done

Ask the person who did the work whether the system was disinfected afterward. Ask which parts were opened, whether the well was exposed to surface water or debris, and whether any pressure tank or tubing was replaced. Write the answers down with the date. A short note saved with your water records is far more useful later than trying to remember the details.

Plan a bacteria test

A coliform and E. coli test is the usual check after a well is opened or serviced. Use a certified lab, follow its sampling instructions exactly, and collect from the tap the lab specifies. Keep the sample cold and deliver it on the day the lab requires. Sloppy sampling can produce a misleading result in either direction, so the paperwork matters as much as the bottle.

Time the retest carefully

Do not sample right after disinfection unless the lab or the service provider has confirmed the process is finished. A disinfectant used to treat a well needs time to clear, and a sample taken too soon can reflect the treatment rather than the water's normal condition. Ask the lab for its guidance on wait time, and ask the service provider when disinfection was completed. A result taken after the system has run normally for a while tells you more than one clean result taken right after the work.

Add lead to the list in south and west Arnold

Well owners in the south and west parts of Arnold should add lead to the testing list. EPA is actively addressing lead and other heavy metals in private wells tied to the Southwest Jefferson County Mining Superfund area, so wells in that part of the county are worth checking. Lead can reach water through pipes, fittings, and solder, and it can also occur naturally in some groundwater. A lead test is a separate analysis, so ask the lab to include it on the order. If you are unsure whether your property falls within that area, ask your county health office or the agency that manages the Superfund site for mapping information.

Hold drinking water until results are back

Until bacteria results come back clean and any requested metals results are in hand, use water from a source you already know is suitable for drinking and cooking. Bottled water is the simplest choice while you wait. Keep the water you are not using for drinking separate so you do not mix up containers.

Read the lab report

  • Confirm the report lists the sample date, the lab name, and every test you asked for.
  • Check the bacteria result and note whether any organisms were detected.
  • Check the lead result if you requested one, and note the reporting limit the lab used.
  • If anything is flagged, ask the lab and the service provider what disinfection and retest steps come next.
  • File the report with your repair paperwork before you make any decision about use.

Keep a repair record

A simple folder with dates, the work performed, lab reports, and notes on taste, color, or odor gives you a baseline. If the water changes later, the history makes it easier to tell whether the change followed the repair or came from something else. Keep the folder with your home papers so it stays available when you sell or refinance.

When to ask for more help

If the results are unclear, if the water changes after the work, or if the well was opened during or just after heavy rain or flooding, ask a qualified professional to review the findings with you. A professional can evaluate the system, but decisions about treatment and retesting should stay with you, guided by the lab report and the records you kept.