Michigan State University Extension publishes several bulletins on water quality and management issues.  To obtain copies, contact your local MSU Extension Office or view the Education Materials Distribution Center at http://web2.msue.msu.edu/bulletins/intro.cfm.  Some publications are available free as .pdf files.  Below is a list of publications that may interest you.

WQ 02 Testing of Private Wells
WQ 13 Maintaining your Septic System
WQ 52 Managing Shoreline Property to Protect Water Quality
WQ 55 A Citizen's Guide for the Identification, Mapping, and Management of the Common Rooted Aquatic Plants of Michigan Lakes
WQ 56 Integrated Pest Management for Nuisance Exotics in Michigan

E 1554 Managing Michigan Ponds for Sport Fishing
E 1641 How Much is a Part Per Million?
E 1858 Using Spray Additives with Herbicides
E 2182 Reading a Pesticide Label
E 2215 Using Pesticides Safely: A Guide for the Applicator
E 2437 Aquatic Pest Management: A Training Manual
E 2586 Your Lake and You!
E 2725 What Does a Pesticide Label Say?
E 2745 Safe Harvest and Disposal of Aquatic Weedy Plants
E 2760 Choosing a Pest Control Company

E05TURF Fertilizing Home Lawns to Preserve Water Quality
E09TURF Irrigation Practices to Preserve Water Quality
E11TURF Maintaining Waterfront Turf to Preserve Water Quality
E12TURF Managing Yard Waste to Preserve Water Quality
E13TURF Mowing Lawn Turf

FAS 2 Improving Pesticide Storage and Handling
FAS 3 Improving Fertilizer Storage and Handling

AM 037 Pesticide Emergency Information
AM 095 Rinsing and Recycling Pesticide Containers