Private wells have no central disinfection, so bacteria and other pathogens are a genuine, sometimes serious risk. Here is how to test for them, why UV paired with filtration is the standard answer, and how treatment qualifies for HSA/FSA.
Why it matters
A clear health risk on wells — and a strong eligibility case. Because no utility disinfects your well, provider-documented UV and filtration map cleanly to medical necessity.
City water is disinfected before it reaches you; well water is not. That means microbial safety is entirely your responsibility. Contamination can come from surface runoff, septic systems, flooding, or a compromised well cap, and it often gives no taste or smell warning — testing is the only way to know.
Routine well testing looks for total coliform and E. coli as indicators that disease-causing organisms may be present. Protozoa such as Giardia and Cryptosporidium, and various bacteria and viruses, can also occur. The CDC provides guidance on private-well safety and testing frequency.
Test at least annually, and after flooding, repairs, or any change in taste or odor — immediately if anyone in the home is immunocompromised. See water test kits; a positive result is strong documentation for your Letter of Medical Necessity.
UV purification inactivates bacteria, viruses, and protozoa without chemicals, and is the most direct microbial barrier — but it needs clear water to work, so it follows sediment and carbon filtration. Together they form a complete treatment train. See UV eligibility.
For wells, test for total coliform and E. coli at least once a year, and immediately after flooding, well repairs, or any change in taste, color, or odor. The CDC recommends nitrate testing periodically as well. Total coliform is an indicator: its presence signals that disease-causing organisms could get in, prompting further action.
A UV system passes water under an ultraviolet-C lamp whose dose (measured in mJ/cm²) scrambles the DNA of bacteria, viruses, and protozoa so they cannot reproduce or infect — without adding any chemicals or taste. Two conditions make it work: the water must be clear (UV cannot penetrate cloudy water, so sediment and carbon pre-filtration come first), and the lamp is replaced annually as its output fades.
A positive bacteria result usually calls for disinfecting the well (often shock chlorination), fixing the entry point if one is found, and retesting — then installing UV for ongoing protection. For an immunocompromised household, treat a positive result as urgent and follow your provider's guidance.
UV inactivates microbes; pair it with well filtration so the water is clear enough for UV to work. Eligible via the TrueMed checkout.
See UV purification → See well filtration →Disinfection is inherently health-related, so a provider can readily document the need — see the Letter of Medical Necessity guide. Educational only, not medical advice.
Yes, with a Letter of Medical Necessity. Because UV exists to inactivate disease-causing microbes, it is one of the clearest medical-necessity cases, especially on well water.
Test for total coliform and E. coli, which indicate possible contamination. Bacteria often give no taste or smell warning, so annual testing is recommended.
No. UV disinfects but does not remove particles or chemicals and needs clear water to work, so it is paired with sediment and carbon filtration.
