"Manure and Pasture Management for Recreational Horse Owners", a series of web sites by the University of Minnesota Extension Service. Includes plans for building a composting bin, detailed discussion of the composting process, information on pasture management, and an extensive list of additional sources of information.
This link takes you to the online version of the Good Neighbor Guide for Horse-Keeping: Manure Management, an excellent publication developed by the University of New Hampshire Cooperative Extension Service, New Hampshire Department of Environmental Services, and Natural Resources Conservation Service.
"Environmental Guidelines for Horse Owners" by the British Columbia Ministry of Agriculture and Food.  Extensive coverage of environmental issues for horse owners including manure management and storage as well as more general resource protection issues.  The site also provides other references.

MassDAR Agricultural Environmental Enhancement Program
Massachusetts Department of Food & Agriculture is a source of funding for some commercial agriculture management strategies.

USDA Natural Resources Conservation Service
The Natural Resources Conservation Service is a Federal agency that works in partnership with the American people to conserve and sustain our natural resources.

Natural Resource Conservation Service Centers:
Berkshire CD: 413-443-6867
Hampden-Hampshire CD: 413-586-5440
Essex-Middlesex-Suffolk CD: 978-692-1904
N.E.N.W., S. Worcester CD: 508-829-6628
Bristol-Plymouth-Norfolk CD: 508-295-5151
Cape Cod-Nantucket-Dukes CD: 508-771-6476
UMass Cooperative Extension Service: 413-545-4800

US EPA: What is Nonpoint Source Pollution?
EPA's home page for general information about non-point source pollution and watershed protection

US EPA: Animal Feeding Operations - Best Management Practices
Agricultural Best Management Practices from the US Environmental Protection Agency
The State of New Hampshire's Department of Environmental Services Water Supply Fact Sheets. There are detailed fact sheets about types of wells, proper methods of abandonment and sealing and water quality.

A short summary of a project by the National Center for Environmental research, demonstrating the beneficial effect of riparian poplar tree buffers on water quality
"West Nile Virus: A Risk to Horses in Massachusetts?" West Nile Virus is a mosquito-borne disease, and mosquitoes need water for breeding. The mosquito that carries this virus breeds in stagnant water, not in ponds and wetlands. This fact sheet from the Massachusetts Department of Public Health discusses statistics, symptoms, ways to reduce risk, and provides links to other related sites.

For other fact sheets regarding water quality and horse management, or for technical assistance and information about grant funding to address nonpoint source pollution, contact Jane Peirce, Nonpoint Source Coordinator, at 508-767-2792 or

Information and publications about Massachusetts DEP Drinking Water Program and Regulations
Regional Coordinators, Drinking Water Program:
Western Regional Office - Deirdre Doherty, 413-755-2148
Central Regional Office - Marielle Stone, 508-767-2827
Northeast Regional Office - Tom Mahin, 978-694-3226
Southeast Regional Office - Richard Rondeau, 508-946-2816
Boston Water Supply - Kathleen Romero, 617-292-5727