UV Disinfection

UV systems use ultraviolet light to kill or inactivate bacteria, viruses, and parasites. They don't filter particles - they disinfect. Essential for well water.

Written by WaterFilterMatch Editorial TeamApril 2026

System Cost

$200 - $670

Annual Filters

$60 - $200 for lamp replacement

Installation

DIY moderate

How It Works

Water flows through a stainless steel chamber containing a UV-C lamp (254 nm wavelength). The UV light damages the DNA of microorganisms, preventing them from reproducing. NSF 55 Class A systems deliver a minimum dose of 40 mJ/cm2, which is sufficient to inactivate 99.99% of bacteria, viruses, and protozoan cysts. UV does not add chemicals or change water taste. The lamp requires annual replacement.

What It Removes

Removes Well

E. coli and coliform bacteria (99.99%)
Viruses including norovirus and hepatitis
Giardia and Cryptosporidium cysts
Other pathogenic microorganisms

Does NOT Remove

Any chemical contaminants (chlorine, lead, PFAS, VOCs)
Sediment or turbidity (must pre-filter to < 5 NTU for UV to work)
Dissolved minerals or hardness
Taste and odor

Installation

DIY moderate. Installs on the main water line or at point-of-use. Requires 1-inch plumbing connections and a nearby electrical outlet. Typically paired with a sediment pre-filter. Not a standalone solution - always used alongside other filtration.