Municipal water treatment is effective at what it is designed to do — kill pathogens that cause acute illness. Chlorine or chloramine disinfection has prevented countless waterborne disease outbreaks since its widespread adoption in the early twentieth century. But safe and optimal are not the same thing. The water that arrives at your tap may be free of bacteria and parasites while still containing chlorine, lead from aging distribution pipes, pharmaceutical residues, PFAS compounds, microplastics, and agricultural runoff that treatment facilities were never designed to remove.
Types of Filters and What They Address
Activated carbon filters — found in pitcher filters (Brita, PUR), faucet-mounted filters, and refrigerator filters — remove chlorine, many VOCs, and improve taste and odor. They are the most accessible entry point. What they do not remove: lead, fluoride, dissolved minerals, PFAS, and most pharmaceutical compounds. They are a meaningful improvement over unfiltered tap water, but they are not comprehensive.
Reverse osmosis systems force water through a semi-permeable membrane that removes the broadest range of contaminants — including lead, fluoride, arsenic, PFAS, dissolved solids, and most pharmaceutical residues. The trade-off: RO also removes beneficial minerals (calcium, magnesium) and produces wastewater (typically 2–4 gallons of waste per gallon of filtered water). A remineralization stage can restore mineral content. Under-sink RO systems cost $150–$400 and provide filtered water at a dedicated faucet.
Whole-house systems treat all water entering the home — including shower water, laundry water, and water used for cleaning. This addresses the dermal absorption and inhalation exposure pathways that point-of-use drinking filters do not. A whole-house carbon filter or multi-stage system is the most comprehensive approach but requires professional installation and periodic media replacement.
Start with Your Water Report
Every municipality is required to publish an annual Consumer Confidence Report (CCR) detailing exactly what is in the water supply — tested contaminants, detected levels, and regulatory limits. This document tells you what your specific water profile looks like so you can choose filtration that addresses your actual contaminants rather than guessing. Search your utility name plus “water quality report” or “consumer confidence report” to find it.
A home water test kit ($30–$100) supplements the CCR by testing what arrives at your specific tap — accounting for contaminants that enter through your home’s own plumbing, including lead from solder joints, copper from pipes, and bacteria from aging fixtures.
Where To Start
- Read your Consumer Confidence Report. Your municipality provides it annually.
- Start with activated carbon for drinking water. Removes chlorine, improves taste immediately.
- Consider a shower filter. Chlorine volatilizes in hot water. A KDF/carbon filter reduces this for under $50.
The right filter depends on what is in your water. Start with the data — your CCR and a home test — choose the filtration that matches, and improve the quality of what your family drinks, cooks with, and bathes in every day.
Have you ever read your municipal water quality report — and do you know what is in your tap water?