Whole-House Water Filtration
Whole-house (point-of-entry) filtration systems treat all water entering a home before it reaches any tap, shower, or appliance. They are available in a range of media types targeting different contaminants. Most systems combine a sediment pre-filter with one or more treatment stages. The right system depends entirely on what contaminants are in your specific water supply.
What It Does
Whole-house filtration systems are installed at the main water supply line, ensuring every water outlet in the home receives treated water. Unlike under-sink systems that only treat drinking water, whole-house systems address dermal and inhalation exposure through bathing and showering — particularly relevant for volatile compounds like chloroform that can off-gas in showers. They are available as single-stage sediment filters, multi-stage carbon systems, iron/sulfur filters, and combination systems.
What It Does and Doesn't Solve
Effectively Addresses
Chlorine and chloramine taste/odor throughout the home (with carbon media)
Sediment, sand, and particles (with sediment pre-filter)
Iron and manganese staining (with oxidizing filter media)
Hydrogen sulfide odor ('rotten egg' smell from wells)
Volatile organic compounds via carbon — reduced dermal/inhalation exposure in shower
Disinfection byproducts — reduced throughout the home
Turbidity and suspended particles
Does Not Address
PFAS — standard whole-house carbon has limited PFAS capacity; specialized PFAS media exists but is expensive
Lead — usually a household plumbing issue best addressed at the point of use
Nitrates — requires reverse osmosis or ion exchange at point of use
Bacteria and viruses — requires UV addition
Hard water — requires ion exchange water softener
Best For
Homeowners on municipal water who want to reduce chlorine and DBP exposure throughout the home (including showers). Also the first treatment stage for well water, often combined with UV and an under-sink RO system for comprehensive treatment.
Cost & Maintenance
Cost Range
$150–$800 for the system; $100–$300/year in replacement filters depending on system type and water quality.
Maintenance
Sediment pre-filter: every 3–6 months. Carbon media: every 6–12 months for standard household use. Catalytic carbon (for chloramine): every 12 months. Iron/sulfur media: backwash regularly, replace every 5–10 years. Replace on schedule — overloaded filters reduce effectiveness and can harbor bacteria.
Installation Type
Installed at the main water supply line where it enters the home, before the water heater. Requires cutting the supply line, installing bypass valves, and plumbing in the filter housing. Professional installation is recommended; typical cost is $200–$400 in labor. Most systems fit a standard plumbing connection.
Contaminants Addressed by Whole-House Filter
Frequently Asked Questions
Related Pages
Data Sources & Provenance
All data on this page is sourced from official U.S. government or public datasets.
At a Glance
Type
Point-of-Entry (Whole-Home)
Cost Range
$150–$800 for the system; $100–$300/year in replacement filters depending on system type and water quality
Contaminants Addressed
7 known
NSF/ANSI Certification
Always verify that a specific filter product is certified by NSF International or the Water Quality Association (WQA) for the contaminants you are targeting. Brand names alone do not guarantee effectiveness.
Other Treatment Methods