IA DNR: Registry of Hazardous Waste Disposal Sites

All sites listed on the Registry are classified according to the relative priority listing for remedial action at the site. The five classification categories are specified in Section 455B.427.3 of the Code of Iowa. During the initial listing, the site must be placed in one of the first four classifications ("a", "b", "c", or "d"). The action priorities for the five classifications are shown in the following table.

While a site is listed on the Registry, its classification can be changed because of site cleanup activities or because of new information about the site.

Registry Priority Classifications
Class	Action Required	Site Condition
"a"	Immediate Action Required	Causing or presenting an imminent danger of irreversible or irreparable damage to the public health or environment.
"b"	Action Required	Significant threat to the environment.
"c"	Action May Be Deferred	Not a significant threat to the environment.
"d"	Requires Continued Management	Site properly closed.
"e"	No Further Action Required	Site properly closed no evidence of present or potential adverse impact.