UV Water Treatment System Installation — Lothian, MD
A Lothian family tested positive for total coliform bacteria in their well water. We installed a UV disinfection system and whole-house sediment filter. Follow-up test confirmed bacteria-free water.
The Problem
A family in Lothian had their well water tested as part of a home purchase. The test came back positive for total coliform bacteria — not E. coli, but a result that required treatment before the mortgage lender would approve the loan. The well was 35 years old and had never been tested.
Our Diagnosis
We inspected the well cap and casing. The well cap had a small crack that could allow surface water infiltration. We also found that the well had never been shock-chlorinated. The coliform result was likely from surface water intrusion through the cracked cap. We recommended: (1) replace the well cap, (2) shock chlorinate the well, and (3) install a UV disinfection system as a permanent barrier against biological contamination.
The Repair Process
- 1Replaced cracked well cap with new sanitary well cap
- 2Shock chlorinated the well with sodium hypochlorite solution
- 3Flushed chlorine through all household plumbing
- 4Waited 24 hours, then flushed chlorine from system
- 5Installed 5-micron sediment filter (required upstream of UV)
- 6Installed Viqua D4 UV disinfection system at point of entry
- 7Tested UV lamp output and verified proper flow rate
- 8Collected water sample for follow-up bacteria test
The Outcome
Follow-up bacteria test: negative for total coliform and E. coli. The mortgage lender accepted the test results and the home sale closed on schedule. The UV system provides continuous protection against biological contamination.
Key Takeaway
UV disinfection is the safest, most effective method for treating biological contamination in well water. It kills bacteria, viruses, and protozoa without adding chemicals to the water. Annual lamp replacement is the only maintenance required.
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May 2026
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June 2026
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Dunkirk, MD
June 2026
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