UV Disinfection System Installation — Prince Frederick, MD
A Prince Frederick homeowner had recurring coliform bacteria in their well water despite two shock chlorinations in three years. We installed a Viqua UV disinfection system at the point of entry — providing continuous, chemical-free bacteria protection.
The Problem
A Prince Frederick homeowner had tested positive for coliform bacteria twice in three years. Each time, shock chlorination had cleared the bacteria — but it returned within 12–18 months. The recurring contamination suggested an ongoing entry point that could not be fully sealed. A permanent disinfection solution was needed.
Our Diagnosis
Recurring coliform despite shock chlorination indicated a persistent contamination pathway — likely a hairline crack in the casing below grade that was impossible to seal without well rehabilitation. A UV disinfection system installed at the point of entry would provide continuous, chemical-free protection regardless of the contamination source.
The Repair Process
- 1Confirmed recurring coliform — third positive test in three years
- 2Assessed water quality for UV compatibility — iron 0.2 ppm, turbidity low, UV transmittance adequate
- 3Selected Viqua D4 UV system (12 GPM capacity)
- 4Installed UV system on main supply line after pressure tank
- 5Installed pre-filter (5 micron sediment) upstream of UV unit
- 6Connected UV monitor and alarm
- 7Tested UV lamp output — confirmed adequate UV dose
- 8Post-installation water test at 30 days — bacteria-free
The Outcome
UV system installed and operational. 30-day post-installation test confirmed bacteria-free water. Homeowner has peace of mind with continuous protection. Annual UV lamp replacement scheduled.
Key Takeaway
When coliform bacteria recurs after shock chlorination, a UV disinfection system is the appropriate long-term solution. UV provides continuous, chemical-free protection without affecting taste or adding chemicals to the water. Annual lamp replacement maintains effectiveness.
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May 2026
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June 2026
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Dunkirk, MD
June 2026
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