The following government resources may be helpful in your research. You can also limit Google search results to federal & state government websites by adding site:.gov at the end of your search terms. Example: water quality site:.gov
See Iowa resources above for EPA & U.S. Army Corps of Engineers. In addition, these resources may be useful.
Timesaver Strategy! Once you have found an article, borrow the citations to find more. Here's how:
If UNI doesn't own/subscribe to an article you need, feel free to request through Interlibrary Loan. If you need help with this process, see Anne Marie.