DENVER — The American Water Works Association (AWWA) has released a cost-impact assessment for a perchlorate regulation pending at the U.S. Environmental Protection Agency (EPA), according to a press release.

The compliance cost will be relatively low, according to Kevin Morley of AWWA Government Affairs, because only a small number of public water systems will be affected by the proposed regulations, the release reported.

The cost-impact assessment updates a 2009 review, considering ion exchange in addition to costs associated with blending, source abandonment and development of new sources, noted the release.

According to the release, compliance costs for a perchlorate maximum contaminant level (MCL) ranging from 2 ppb to 24 ppb are smaller than estimated compliance costs for other drinking water regulations.

"Small water systems in particular could see treatment costs increase by three dollars per 1,000 gallons," said Morley.

Read the full report here.