"Indiana waters today are decidedly cleaner than they were decades ago. Regulatory programs for industrial and municipal discharges have been implemented. Furthermore, Indiana's 1996 surface water monitoring strategy has assessed all lakes and streams in the state for their intended use. The intended outcome is to improve upon the fact that 63% of Indiana's 35,673 miles of streams fully support aquatic life use and 46% support full body contact recreational use. Almost all of Indiana's 59 miles of Lake Michigan shoreline, outside the Indiana harbor, fully supports aquatic life use."
"Indiana, in partnership with U.S. EPA and other stakeholders, can be proud of its environmental record, but must be ready for continuing challenges. This agreement, addressing near-term focus points and program specific elements and corresponding work plans, is designed to outline those commitments. The outcomes are intended to improve environmental conditions in the state of Indiana and provide a mechanism to track the improvement."
When researching exact statistics, you will find Indiana's (local govt) promising to match or exceed EPA regulations, the typical govt promises. There are a few factories but the bulk of them seem to be in Northern Indiana. From living here all of my life, and traveling throughout the states and overseas our air quality seems exceptional. No issues with ground water. May need a water softner for city water! :)
When it comes the 'best environment' I would say further away from the city, (all though are city is surprisingly clean). Geist (Lawrence) is nice, homes are spread apart, shopping/strip malls are spread apart. There is also a resovoir. A couple of parks for recreational activities (biking/hiking). Let me know if you would like to receive some a list of avaiable homes in the Geist area?