Most of the water that reaches a private well travels down through the ground, but the top of the well is where surface water, insects, and debris can get in if something is damaged. In and around Arnold, heavy rain and runoff can pool around a wellhead quickly, so a few minutes of looking at the well after a big storm is a useful habit. This guide walks through what a homeowner can check safely from the ground, when to call a professional, and how to sample the water afterward.
What the Well Top Should Look Like
The well casing is the pipe that rises out of the ground and protects the well opening. It should extend well above the surrounding soil, and the ground around it should slope away so water drains off rather than collecting. Look for these basics:
- A cap or sanitary seal that sits snugly on top of the casing with no gaps you can see or slide a fingernail into.
- A vent with an intact screen. A torn, crushed, or missing screen lets in insects and dirt.
- A casing that is upright, not cracked, bent, or pulling away from the pad.
- Ground that slopes away from the casing, with no low spot holding standing water.
- No signs of animals nesting or entering near the wellhead.
- Electrical boxes and wiring nearby that are dry, sealed, and in good repair.
Take a photo of the well top the first time you inspect it. A dated photo makes it easier to notice changes later, especially after storms.
What to Avoid Doing Yourself
Do not open the well cap, enter a well pit, or work on pressure equipment unless you have training for it. Some wells sit in pits, and flooded pits can be hazardous. If you find a cracked casing, a loose seal, a flooded pit, or a damaged vent, contact a licensed well contractor who can inspect the well and recommend repairs. A visual check tells you where to look, but a qualified professional can confirm what is actually happening underground.
After Heavy Rain or Flooding
Clear water is not proof of safe water. After heavy rain, flooding, or runoff near your property, pay attention to changes in how the water looks, smells, and tastes. Cloudiness, new sediment, a new odor, or a change in taste all count as reasons to test rather than wait.
A bacteria test for coliform and E. coli is the standard first step after flooding or a damaged well top. Use a lab certified for drinking water testing, and follow its sample instructions exactly, including how to clean the tap, when to collect, and how to get the sample to the lab in time. Many labs ask for the sample to arrive within a set window, so plan the sampling day ahead of time.
Lead Sampling for South and West Wells
If your property is in the south or west part of Jefferson County, pay particular attention to lead. The EPA is working on lead and other heavy metals in private wells tied to the SW Jefferson County Mining Superfund area, and well owners in those parts of the county are encouraged to sample for lead. Lead is a metal that can occur in groundwater, and a test is the only way to know whether it is present in your water.
When you call a lab, ask specifically for a lead test and confirm the sampling instructions. Labs often ask for a first-draw sample taken after water has sat in the plumbing for several hours, typically overnight, so the sample reflects what has been in contact with your pipes and fixtures. Ask the lab to explain its timing rules before you collect the sample, and keep the paperwork that comes with the results.
A Simple Sequence to Follow
- Walk around the well top and check the cap, vent, casing, and grading. Take a dated photo.
- Note any changes in color, clarity, smell, or taste, and write them down with the date.
- If the well was flooded or the top was damaged, schedule a professional inspection before relying on the water.
- Order a bacteria test for coliform and E. coli. Ask about lead if your property is in the south or west part of the county.
- Keep your results and the lab's instructions together so you can compare future tests.
Arnold homes on private wells vary in age, depth, and construction, so the same storm can affect two neighboring properties differently. A consistent habit of inspecting, noting, and testing gives you a clear picture of your own well over time, and it gives you a sound basis for deciding what to do next.