Animal parts found in the city of Carroll's water system in two separate instances since the first of March have been determined not to be human and are further being analyzed to determine the species.
Materials collected from a pipe in the water supply, including parts of a plastic sack, were being transferred to Ames on Tuesday to try and determine what kind of animal or animals were found in the pipes.
Chlorine residual levels remain slightly elevated within the Carroll water, meaning the water is safe to drink, according to Dennis Alt, supervisor of the DNR's water supply section.
Chlorine is used to prevent bacteria growth, and the residuals indicated that the chlorine was at a level necessary to ensure safe drinking water.
"When something like this happens our first priority is to make sure the water is safe for the public and we are confident that it is. Our next priority right now is to determine how this has happened so we can prevent it from happening again," Alt said.
The latest incident occurred April 21 when the city was conducting its annual flushing of water mains and some smaller bones, parts of a plastic sack and a meaty/fatty tissue was expelled from a water hydrant. A similar incident occurred during the first week of March when the pipe serving a residence in Carroll became clogged from a meaty or fatty substance.
Officials are working to track the animal remains back to its source, and are not yet certain whether the remains were purposely placed there, or if some animals had gotten into the water pipes somehow and died there.