"Revised March 2008"--Tp. "This report was prepared by the CSC Microbiology and Biochemistry Studies Group under subcontract to the Cadmus Group contract 68-C-02-026"--P. i. "EPA 815-C-08-002." Includes bibliographical references.

EPA revised this guidance document in March 2008 to clarify text describing the analytical methods approved for use for source water monitoring under the GWR. The objective of the source water monitoring methods guidance document is to provide ground water systems, States, Tribes, and other primacy agencies with a brief review of the source water monitoring provisions. Since the primacy agencies may select one of three fecal indicators (e.g., E. coli, enterococci, coliphage) that the system would be required to test for in the ground water source sample, the source water monitoring methods guidance manual provides criteria to assist primacy agencies determine which fecal indicator is most appropriate to test for in the geographic region of that agency.