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For most people, the answer is no. Safe Drinking Water Act standards are set to ensure that your tap water is safe. People who have medical conditions that might put them at special risk should discuss the need for a water filter with their doctors. All public water systems are required to complete an Annual Drinking Water Quality Report (a "Consumer Confidence Report") and distribute this report to system users (see list above).
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Many stores and companies sell various home treatment devices, ranging from small faucet-mounted filters to “whole-house” systems to water softeners. While we cannot recommend specific brands or products, the following information should be helpful. For specific project information, contact NSF International, Consumer Report, or the device manufacturer. Maintenance is important with any home treatment device, as an inadequately maintained filter can actually reduce water quality.