Find the right water treatment system for your home

Search 56 whole-house filters, softeners, UV and reverse osmosis systems. Each one is graded on independent certification, 10-year cost, flow, warranty and returns.

Not sure what is in your water? Look up your utility's EPA results or test a well.

56systems graded

22brands covered

19hold a system certification

10,313utilities in our PFAS lookup

Start here

By water problem

Pick what you want gone. We show every system that claims it, certified ones first.

By water source

City water is already disinfected; a private well is untested until you test it. They need different systems.

City waterChlorine, chloramine, PFAS, scale Private wellIron, sulfur, manganese, bacteria, hardness

By system type

Already know what you need? Browse one kind of system.

Top-graded system in each category

See all 56 systems

Category	System	Grade	Price	10-yr cost	Certified to
Whole-house filter (city water)	SpringWell CF1	B	$1,160	$2,814	None	Check price
Whole-house filter (well water)	SpringWell WS1	C	$2,231	$2,731	None	Check price
Water softener	Rheem Preferred RHS32	B	$489	$1,365	NSF/ANSI 44, NSF/ANSI 372, CSA B483.1	Check price
Salt-free conditioner	SpringWell FS1	B	$1,785	$3,087	None	Check price
UV disinfection	LUMINOR BLACKCOMB 5.1 LB5-101B	A	$897	$2,467	NSF/ANSI 55 Class B (listed as LB5-10XB, X = plug type, 13 gpm), CSA B483.1	Check price
Countertop reverse osmosis	AquaTru Carafe (AT100 series)	B	$375	$1,993	NSF/ANSI 42, NSF/ANSI 53, NSF/ANSI 58, NSF/ANSI 401, NSF/ANSI 372	Check price
Under-sink reverse osmosis	Waterdrop G3P800 (WD-G3P800-W)	B	$999	$2,549	NSF/ANSI 58, NSF/ANSI 53, NSF/ANSI 42, NSF/ANSI 372	Check price
Whole-house cartridge system	Aqua-Pure (formerly 3M Aqua-Pure, Solventum) AP904	B	$432	$3,742	NSF/ANSI 42	Check price

Grades follow published rules. Prices from each maker's store, checked September 2026. We earn a commission on some links; it never changes a grade.

Common contaminants

All contaminant pages

Household Chlorine EPA: 4 mg/L (as Cl2) MCL Household Chloramine EPA: 4 mg/L (as Cl2) MCL Health PFAS EPA: 4 ppt each for PFOA and PFOS MCL Health Lead EPA: 15 µg/L (0.015 mg/L) Action level Household Iron EPA: 0.3 mg/L SMCL Health + household Manganese EPA: 0.05 mg/L SMCL Household Hydrogen sulfide EPA: No federal limit Household Hardness EPA: No federal limit Health Bacteria EPA: Zero for total coliform and E. coli MCLG Household Sediment EPA: No limit for household water Health Volatile organic compounds (VOCs) EPA: 5 µg/L each for benzene, TCE and PCE; 2 µg/L for vinyl chloride MCL Health Arsenic EPA: 10 µg/L (0.010 mg/L) MCL Health Nitrate EPA: 10 mg/L as nitrogen MCL Health + household Fluoride EPA: 4.0 mg/L MCL Health + household Copper EPA: 1.3 mg/L Action level Health Uranium EPA: 30 µg/L (0.030 mg/L) MCL

Check your utility's PFAS results

EPA's final UCMR 5 results cover 10,313 public water systems. 1,165 averaged above at least one PFAS limit, serving about 55 million people.

Results by state · Download the data

City of Tempe Serves 165,000 people · 24 PFOA samples from 10 sampling points · Jul 2023 to Mar 2025 Average above an EPA limit

PFOA 37.9 ppt avg · max 38.7

EPA 4

PFOS 55.2 ppt avg · max 55.8

EPA 4

PFHxS 67.8 ppt avg · max 70.5

EPA 10

Hazard index 6.8 avg · max 7.1

EPA 1

Also detected, no federal limit: PFBS, PFHxA, PFPeA, PFBA, PFPeS, PFHpA.

Buying guides and comparisons

All guides

Best picksThe best whole house water filtersWhole house water filter picks for city water, wells and PFAS, judged on certification listings, flow and 10-year cost. Prices checked September 2026.
ComparisonSpringWell vs AquasanaSpringWell CF1 vs Aquasana Rhino, WS1 vs Rhino Well Water with UV, and where HealthShield fits for PFAS: certifications, flow, returns and 10-year cost.
Best picksThe best whole house water filters for well waterWell water systems sorted by problem: iron, manganese and sulfur, bacteria, hardness and sediment. Test first, then match the system. Prices checked September 2026.
ComparisonSpringWell vs US Water SystemsSpringWell CF1, WS1 and FS1 against US Water Systems Matrixx, InFusion and GreenWave: flow, certifications, 10-year cost and restocking fees of 10% vs up to 40%.
Best picksThe best whole house water filters for PFASWhich whole house PFAS filters are actually certified, for which compounds and at what flow, and why a certified RO is often the smarter buy. Checked September 2026.
ComparisoniSpring vs SpringWelliSpring WGB32B and WGB32BM cartridge systems vs SpringWell CF1 and WS1 tanks: upfront and 10-year cost, flow, pressure drop, certifications and who each one suits.
Best picksThe best whole house water filters for city waterWhole house filters for chlorine and chloramine city water, judged on media, flow, certification and 10-year cost, with chloramine explained. Checked Sept 2026.
ComparisonWhole house water filter vs reverse osmosisA whole-house filter treats every tap for chlorine and well problems; reverse osmosis cleans drinking water of PFAS, lead and nitrate. Costs, and when to buy both.
Best picksThe best salt free water softenersSalt-free conditioners reduce scale but leave hardness in your water. Our picks, their inlet limits and 10-year costs, and when a salt softener is the better answer.

How grades work

Five measures, fixed rules, applied by code: certification evidence (30%), 10-year cost (25%), flow (15%), warranty (15%) and returns (15%). "Tested to NSF standards" with no listing and no published lab report earns the lowest evidence grade. Read the full method.