Criteria Review of Chloride, Sulfate and Total Dissolved Solids
Recently, the DNR began to compile all research related to toxicity of chloride, sulfate and total dissolved solids. The purpose was to update and develop criteria for these parameters to better protect aquatic life based on new scientific information.

Proposed Chloride and Sulfate Criteria Fact Sheet
Water Quality Standards Review: Chloride, Sulfate and Total Dissolved Solids
 (Consultation Package Submitted to EPA 2/9/09)
Proposed Chloride Criteria Update (Sent to EPA on 3/2/09)

Proposed Chloride and Sulfate Criteria Presentation
Proposed Chloride Acute and Chronic Criteria Tables
Proposed Sulfate Criteria Table

Chloride, Sulfate and Total Dissolved Solids Rulemaking Documents:
Final Rule    
Responsiveness Summary    
NOIA    
Fiscal Impact Statement
 

Iron:
No numerical criteria have been adopted in Iowa’s Water Quality Standards for iron since there are no iron national criteria. IDNR recommends the use of a total iron concentration of 1 mg/l for the implementation of general criterion.

Issue Paper: Iron Criteria and Implementation for Iowa Surface Waters