Water filtration in Phoenix

Water Treatment Phoenix is an independent referral service, not an installer, plumber or water utility. When you send the form, your details go to an independent local water treatment pro who can contact you and prepare a quote.

Start with what you want removed

Choosing home water treatment starts with a simple question: what contaminant do you want to remove or reduce? The usual advice is to select a unit certified by NSF, Underwriters Laboratories or the Water Quality Association to remove that contaminant, and to make sure the certification covers it. That advice protects you from buying a filter for a problem you do not have.

• A taste or an odor: a filter certified to NSF/ANSI 42, the standard for aesthetic effects such as chlorine, taste and odor.
• A health-related contaminant such as lead: a filter certified to NSF/ANSI 53 for that contaminant.
• Incidental contaminants: NSF/ANSI 401 covers a set of incidental contaminants; check which ones a product lists.
• Ultraviolet treatment: NSF/ANSI 55 covers ultraviolet systems, in Class A and Class B; ask which class a unit is certified to and for what.
• Dissolved solids at the kitchen tap: reverse osmosis, certified to NSF/ANSI 58.
• Hardness and scale: a water softener, certified to NSF/ANSI 44. A filter is not the tool for hardness.

What Phoenix water reports

City of Phoenix Water Services draws most of its water from rivers. In 2025, its report says, about 97 to 99% came from the Salt, Verde and Colorado rivers, with about 2% from about 20 city wells. The report lists total dissolved solids of 464 to 716 ppm and hardness of 10 to 17.6 grains per gallon.

The report also says taste, odor and hardness are not regulated under drinking water health standards. That matters for filtration: a taste you notice is something you may choose to treat, not a sign that the water fails a health rule. Read the city’s report yourself; the Phoenix water quality guide shows where to find each figure.

Whole-house or one tap?

There are two places to put a filter, and they do different jobs.

	Whole-house (point of entry)	One tap (point of use)
Where it goes	On the main line, before the water heater	Under a sink or on one faucet
What it treats	Every tap, shower and appliance	Water from that one tap
Chosen when	A taste or odor in showers as well as drinking water	Drinking and cooking water only
Upkeep	Cartridges or media on the maker’s schedule	Cartridges on the maker’s schedule

If you only care about the water you drink, a point-of-use filter or reverse osmosis at the kitchen sink may be all you need. If you notice the taste or smell in the shower too, a whole-house filter on the main line treats everything. Some households combine them with a softener; see whole-house water softeners.

Staining, color and metallic tastes

EPA publishes secondary drinking water standards for nuisance chemicals: non-mandatory guidelines for taste, color and staining that it does not enforce. They give a useful vocabulary when you describe a problem to a pro.

Substance	EPA secondary guideline	What it causes
Iron	0.3 mg/L	Rusty color, sediment, metallic taste, reddish or orange staining
Manganese	0.05 mg/L	Black to brown color, black staining, bitter metallic taste
Chloride	250 mg/L	Salty taste
Total dissolved solids	500 mg/L	Hardness, deposits, colored water, staining, salty taste
pH	6.5 to 8.5

If you see staining or taste metal, say so on the form. A pro can test for the cause before suggesting a filter, so you buy for the problem you have.

PFAS and what EPA has decided

PFAS are a group of chemicals that EPA regulates in public water. EPA’s final rule set enforceable limits of 4.0 parts per trillion for PFOA and for PFOS. On May 18, 2026, EPA proposed two changes: one keeps the PFOA and PFOS limits and lets water systems request two more years, to 2031, to comply; the other would rescind the limits for PFHxS, PFNA, HFPO-DA (GenX) and the mixture hazard index. Those were proposals when this page was written; EPA’s PFAS page has the current status.

EPA’s WaterSense page says reverse osmosis systems can potentially remove contaminants including PFAS. If PFAS is your concern, ask what a filter or RO system is certified to reduce and check that claim against the certification listing.

Questions to ask about a filter

1. What contaminant is this filter meant to remove, and is it certified for it?
2. Which NSF/ANSI standard does that certification name: 42, 53, 401, 55 or 58?
3. Is it whole-house or one tap, and why that choice for my home?
4. What does the maker’s schedule say about changing cartridges or media?
5. Does the filter work with my softener, and which goes first on the line?

Write the answers on the quote. A filter sold without a named contaminant and a matching certification is hard to judge.

Filtration and hardness

A filter is not a softener. With Phoenix hardness at 10 to 17.6 grains per gallon in the city’s report, scale on fixtures is a softener problem. If you want both better taste and less scale, ask for a combined quote; water softeners in Phoenix explains the softener side.

Purification versus filtration

You will see both words. Filtration tends to mean a filter chosen for taste, odor or a named contaminant; purification is used for systems that aim to remove more, such as reverse osmosis or ultraviolet treatment. The words are used loosely, so go by the certification, not the label. See water purification in Phoenix.

Upkeep

Every filter needs its cartridges or media changed on the schedule the maker sets. A filter that is past its schedule is not doing the job it was certified for. Ask the pro to note the change dates on the unit and on your quote.

If your home is on a private well

If your home draws from a private well rather than a city system, the rules are different. EPA says private well owners are responsible for the safety of their own water, and it advises testing a private well every year for total coliform bacteria, nitrates, total dissolved solids and pH, using a laboratory certified for drinking water testing. Test first, then choose treatment for what the results show. A filter chosen without a test is a guess.

What affects the size of a filtration job

This site prints no prices. These are the things that change what a filtration job involves, so two quotes can be compared fairly:

• Where it goes: a whole-house filter is cut into the main line; a point-of-use filter sits under one sink.
• What it treats: a filter certified for a named health contaminant is a different product from one certified for taste and odor.
• How many stages: a sediment stage, a carbon stage, or more, each with its own cartridge.
• Your other equipment: the order of a filter and a softener on the line, and whether both are fitted on one visit.
• Upkeep: how often the cartridges or media need changing on the maker’s schedule, and what they cost to replace.

Ask each pro to list these items on the quote, with the certification of each part.

How to ask for a filtration quote

Send the form with your ZIP code and what you notice in your water. Your request goes to an independent water treatment pro in the Valley, who can contact you, test the water and prepare a quote. The City of Phoenix report also points readers to the Water Quality Association, wqa.org, for information on home treatment systems.

Questions people ask