New mandates from the Iowa Department of Natural Resources will likely lead to wastewater rate increases for the city of Pella. The DNR is requiring the city to eliminate all known wastewater bypasses by October 2012 and a plan of action is due this October. Officials say this could mean significant infrastructure upgrades.  City Administrator Mike Nardini says there could be some grant funding available through the I-JOBS program to help offset some of those costs.