The Iowa Department of Natural Resources (DNR) is in the final stages of revising some of Iowa’s water quality standards.
Recently, the DNR compiled all research related to toxicity of three chemicals to aquatic life - total dissolved solids, chloride and sulfate. The purpose was to update and develop criteria for these parameters to better protect aquatic life based on new scientific information. Gaps were identified in the previous research which resulted in new toxicity tests being performed in 2008.
With the availability of new research and toxicity data, the information is now available to propose numeric criteria for chloride and sulfate and reevaluate the current interim approach for total dissolved solids criteria. The Department is planning to present a summary of this information at the April Environmental Protection Commission meeting.
[Read more about State and Federal water quality standards and aquatic toxicology]
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