Private wells are not regulated under the federal Safe Drinking Water Act in the same way as public water systems. Water quality varies by location and well; possible concerns include sediment, minerals, bacteria, and other substances. Testing helps identify what is present before you consider treatment.

Common Well Water Contaminants

Well water characteristics vary by region and geology. Parameters that may be relevant to test include sediment and sand, iron and manganese, hydrogen sulfide, bacteria and coliform, nitrates, and naturally occurring arsenic or radon in some areas.

Recommended System Types

Treatment needs depend on test results and the exact system. Some installations use sediment pre-filters or other stages for operational purposes; do not assume a filter or UV stage addresses a particular contaminant without current, model-specific performance documentation.

Testing First

Before investing in any system, get a comprehensive lab test. Basic kits won't detect everything relevant to wells. An accredited lab test ($150-300) should cover bacteria, nitrates, heavy metals, and ideally radon if you're in an affected area. Test annually at minimum, and after any seismic activity, flooding, or changes to nearby land use.

What to Verify Before Buying

Compare systems only after testing identifies a concern. Review current third-party listings and manufacturer documentation for the exact model and the specific performance claim; a technology name or a general certification reference does not establish contaminant reduction.