This announces the availability of the Twelfth Biennial Report on Great Lakes Water Quality issued by the International Joint Commission. The report includes specific recommendations on the effects of urbanization on our lakes; threats associated with invastive species; pathogens and disease bearing microorganisms in drinking water sources; chemical contamination, methyl mercury and human health; and the recent ecological changes taking place in Lake Erie. For the report, see http://www.ijc.org.