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Best Water Filter for Well Water (2026)
About 43 million Americans drink from private wells, which nobody is required to test. The EPA rules that cover city water don't apply.
Test first. A lab test tells you whether you're dealing with bacteria, nitrate, arsenic, iron, hardness or nothing at all, and each needs different treatment.
Check your own water first
See what EPA records show for your utility and get a filter matched to it.
Free. We don't store your address.
What works
- Lab test through a state-certified lab (once a year, and after floods)
- Whole-house sediment filter for grit and rust
- Reverse osmosis at the kitchen sink for drinking water
- UV disinfection if bacteria show up
What doesn't
- Pitcher filters alone for bacteria or nitrate
- Buying treatment before testing
Our picks
Best match for your water
Lab Water Test Kit for Well Water
- Good for: Finding out what is actually in private well water before buying treatment
- Install: Mail-in sample
- Choose a kit that uses a state-certified lab.
iSpring RCC7AK Under-Sink Reverse Osmosis System
- Good for: PFAS, nitrate, arsenic, fluoride, radium, lead and most other dissolved contaminants
- Install: Under the kitchen sink, about an hour with basic tools
- Manufacturer lists NSF/ANSI 58 testing. Reverse osmosis is the treatment EPA names as most effective for PFAS.
iSpring WGB21B Whole House 2-Stage Filter
- Good for: Sediment, rust and chlorine for the whole house; common on well systems
- Install: Plumbed at the main line; a plumber is recommended
- Manufacturer lists tested performance for sediment and chlorine.
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Questions
How often should I test my well?
At least once a year for bacteria and nitrate, and every few years for a broader panel including arsenic and metals.
Is my house on a well?
Enter your address above. If no public water system covers it, you're most likely on a private well.