Well water filtration is more involved than city water because well water can have widely varying contaminants and you, the homeowner, are responsible for treatment. The right system depends entirely on what's in your water — and the only way to know that is to test it.
Before buying anything, get a comprehensive well water test. The most thorough option is a state-certified lab test (state environmental agencies often offer reduced-cost tests for private wells). A more accessible alternative is a comprehensive home test kit from a service like Tap Score that ships you bottles, you mail them back, and a certified lab analyzes 50-100+ parameters. A multi-strip home test kit ($20-30 from Amazon) covers basics like hardness, iron, pH, nitrates, and chlorine but won't catch arsenic, uranium, radon, or bacteria — for those you need lab analysis.
Bacteria/coliform: Disinfection via shock chlorination annually plus continuous UV treatment for ongoing control. Iron and manganese: Air injection oxidation filters or chemical-feed systems followed by a filter; greensand filters work for moderate iron; for very high iron, dedicated iron filters with regenerating media. Sulfur (rotten egg smell): Same air injection oxidation systems used for iron, plus carbon polishing. Hardness: Water softener (after iron removal — soft order matters). Acidic water (low pH, copper-blue stains): Calcite neutralizer to raise pH and reduce pipe corrosion. Arsenic, uranium, nitrates: Reverse osmosis at point of use, or specialized whole-house systems.
Well water systems are built as a series, with each stage handling a specific issue. A common sequence: sediment pre-filter → iron/sulfur removal → softener → carbon polishing → UV disinfection → optional RO at the kitchen sink. The exact configuration depends on your test results. Skipping a stage (like trying to use a softener to remove iron directly) usually leads to expensive equipment failure within months.
Well systems need more attention than city water. Plan for: annual water testing (or at minimum, after any flooding or unusual events), shock chlorination of the well annually if you have UV treatment failures, sediment filter changes every 1-3 months, carbon filter replacements every 6-12 months, UV bulb replacement annually, and softener salt restocking monthly. Budget $200-500/year in consumables for a typical well treatment system.
Well water needs specialized filtration. Here's what works.
Unlike city water, well water isn't treated or monitored. Common issues include:
Purpose-built for well water. Air injection oxidation removes iron (up to 7 ppm), sulfur (up to 8 ppm), and manganese (up to 1 ppm). Greensand filter plus carbon filtration. Handles most well water issues.
Check Price →For extreme iron problems. AIO (air injection oxidation) system handles iron levels that would overwhelm standard filters. Also removes sulfur and manganese.
Check Price →If your well tests positive for bacteria, UV treatment is the safest solution. Add after sediment/iron filtration. Viqua and Pelican are top brands.
Check Price →How often should I test my well water?
At minimum, test annually for bacteria and nitrates. Test every 3-5 years for a full panel. Also test after any work on the well, flooding, or changes in taste/smell.