Services
Whole-House Water Treatment in New Hampshire
A whole-house system treats every tap in the home and is the right choice when several contaminants are present. A licensed local contractor can test your well and design the right system. Start with a free in-home water test and quote.
What it is and why New Hampshire wells need it
Whole-house water treatment, also called point-of-entry treatment, treats the water where it enters your home so that every tap, shower, and appliance gets treated water. It is the configuration to consider when more than one contaminant is present, when a contaminant affects the whole home rather than just drinking water, or when levels are high.
Some New Hampshire problems point clearly to whole-house treatment. Radon in water needs a point-of-entry system because it escapes into the air throughout the house, and iron and manganese staining affects every fixture and load of laundry. NHDES notes that whole-house arsenic treatment makes sense when arsenic is high or when iron also needs to be removed, while a point-of-use system can be the most cost-effective choice for arsenic alone.
Because New Hampshire bedrock often delivers several contaminants at once, a whole-house system is frequently built in stages, each handling a different problem in the right order.
How a contractor designs a whole-house system
Start with a full test
A whole-house system is designed around your actual water, so a contractor begins with a test that covers arsenic, uranium, radon, iron, manganese, hardness, and bacteria, then builds only what your water calls for.
Stage the treatment in the right order
Multi-contaminant systems are sequenced so each step works. For example, oxidation-filtration for iron and manganese may come before arsenic media, and aeration for radon is placed where it vents safely. Getting the order right protects the downstream stages.
Size it to your household
A contractor sizes the system to your flow rate and water use so treated water keeps up with the whole home, including peak demand.
Pair with point-of-use where it helps
Some homes use a whole-house system for issues like radon and iron, then add a reverse osmosis tap for the lowest-cost protection of drinking and cooking water. A contractor recommends the mix that fits.
What to expect
- 1
Request a free in-home water test
Use the form or call. A licensed local contractor sets up a visit at no cost.
- 2
The contractor tests your water and reviews the results
You get a plain explanation of what is in your water and what it means.
- 3
You get a written, itemized recommendation and quote
If treatment makes sense, the recommendation is matched to your water, with the cost in writing.
- 4
The contractor installs the system
If you choose to proceed, the contractor installs and configures the system for your home.
- 5
The contractor confirms performance and explains maintenance
You leave with a clear maintenance schedule and, where relevant, a retest plan.
What whole-house treatment costs in New Hampshire
NHDES puts a single whole-house filtration step at roughly $1,500 to $3,000 to install, regardless of technology. A whole-house system that addresses several contaminants combines steps, so the cost reflects how many problems it solves and any pre-treatment or post-treatment it needs.
The only way to a real number is a test and a written, itemized quote, which is exactly what the free in-home visit provides. These figures are 2026 New Hampshire market context drawn from NHDES guidance, not a quote.
Where this fits
Related services a contractor often pairs with this one:
Serving well owners in these and other New Hampshire towns:
Read: A New Hampshire Well Water Contaminants OverviewFrequently Asked Questions
When do I need whole-house treatment instead of a single tap?
Whole-house treatment makes sense when several contaminants are present, when a contaminant like radon or iron affects the whole home, or when levels are high. For arsenic alone, a point-of-use system at the kitchen tap is often the most cost-effective choice.
Can one system handle several contaminants?
Yes. A whole-house system is often built in stages, each handling a different contaminant in the right order. A contractor designs the sequence around your test results.
How much space does a whole-house system need?
It varies with the number of treatment stages. A contractor confirms the space needed, usually near where the water line enters the home, during the in-home visit.
Is whole-house treatment more expensive than a tap system?
Generally yes, because it treats all the water in the home and may combine several stages. NHDES puts a single whole-house filtration step at about $1,500 to $3,000, and a multi-stage system costs more. The written quote gives you the real figure.
How often does a whole-house system need service?
Each stage has its own schedule, from backwashing to media and filter changes. The contractor lays out the maintenance plan in the quote so there are no surprises.
Start with a free in-home water test
A licensed local contractor will test your water, explain the results, and give you a written quote. No obligation.