Indiana environmental statutes are found in Indiana Code Title 13 (Enviroment). Because environmental law is so highly regulated, it is also helpful to know that the Indiana Adminstrative Procedures Act is found in Indiana Code Title 4.

In addition to statutes, you must know the regulations as well. Environment-related regulations are found in many sections of the Indiana Adminstrative Code, available for free at the Indiana government website. You can search by term, but becasue the language of regulations is sometimes obscure, make full use of the table of contents as well.

Indiana Department of Environmental Management

It is easy to find many law review citations on Google Scholar, and the relevance searching can be a boon. To access the full-text, though, you will have to use HeinOnline.

Environmental Justice For All: A Fifty-State Survey of Legislation, Policy, and Cases, 4th ed. Steve Bonorris, ed., 2010.

The website of the National Conference of State Legislatures is a good resource for locating, tracking, and comparing state legislation on all sort of issues. The two databases most relevant to environmental law are:

Energy and Environment Legislation Tracking Database

Environmental Health Legislation Database

Search HeinOnline's Subject Compilation of State Laws for articles, books, and other sources that survey state statutory and case law.