The Radionuclides Rule requires compliance with the MCL for radium 226/228. Could a public water system use point-of-use (POU) treatment, point-of-entry (POE) treatment, or bottled water for compliance with the MCL?
POU ion exchange and POU reverse osmosis are listed as small system compliance technologies for combined radium 226/228; no POE technologies are listed. Public water systems are not authorized to use bottled water to comply with an MCL. Bottled water may only be used on a temporary basis to avoid unreasonable risk to health (65 FR 76708,76727; December 7, 2000).
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