Including filter system and high-performance HPC Bacteria filter.
HPC bacteria is a catchall term for many naturally occurring microbes that can show up in household water and plumbing. You may also see the term heterotrophic plate count, which describes the lab method used to estimate overall bacterial growth rather than a single organism. High counts don’t identify a specific pathogen but can indicate conditions where bacteria can multiply. In Noma homes, homeowners sometimes notice related issues such as musty smells, slimy deposits, or faster biofilm buildup on faucets and showerheads.
Heterotrophic plate count numbers tend to increase when water stands in pipes, when sediment or organic material is present, or when plumbing allows biofilm to form. These general bacterial conditions can bring changes in taste or odor, particularly if organics are present in the supply. While many heterotrophic bacteria aren’t known to cause disease, elevated HPC bacteria are a useful signal that your house plumbing or incoming water may need attention. A whole-house strategy installed for Noma properties treats water as it enters the home and helps reduce the chance of regrowth further down the system.
The single most effective whole-house filter-style option for controlling HPC bacteria is a whole-house ultraviolet (UV) disinfection system. UV inactivates microorganisms as water flows through a stainless chamber where it’s exposed to a UV lamp, treating water in real time without adding chemicals or altering taste. When sited at the main supply into your Noma home, a UV system provides protection to every tap, shower, and appliance.
For UV to perform reliably, the water entering the unit must be clear enough for the light to penetrate—heavy sediment, iron, or cloudiness can shield microbes. That’s why whole-house UV installations often include prefiltration ahead of the UV chamber, while the UV stage remains the core technology for targeting microorganisms like HPC bacteria. Correct sizing for your home’s flow rate and regular lamp and sleeve maintenance keep the system working well. Mr. Pure Water can evaluate your Noma plumbing and recommend a whole-house UV setup matched to your needs to help control heterotrophic plate count at the source.