Know what's in your water before you buy a filter.
Different contaminants need different filters. Testing reveals what you're actually dealing with so you don't buy the wrong filter—or more filter than you need.
If you're on municipal water, your utility tests the water and publishes an annual Consumer Confidence Report (CCR). This is free and shows what's in your water.
Simple at-home tests for common concerns. Good for quick screening or verifying specific issues.
Dip strips in water, compare colors. Tests for pH, hardness, chlorine, lead, bacteria, nitrates, and more. Quick but not highly accurate.
Measures Total Dissolved Solids. Useful for checking RO filter performance, but doesn't tell you what's dissolved—just how much.
Specifically tests for lead. Important for older homes (pre-1986). More accurate than strip tests for this specific concern.
Most accurate option. Essential for well water. Mail a sample to a certified lab and get detailed results.
Tests bacteria, nitrates, pH, and a few other parameters. Minimum for well water.
Tests for heavy metals, VOCs, pesticides, and more. Recommended for well water or if you have specific concerns.
Tests everything including PFAS, pharmaceuticals, and specialty contaminants. Good if you're near industrial sites or have unknown contamination.