The 'Regulation and Policy Matrix' was developed in responses to a need for an improved method of more readily identifying the U.S. Environmental Protection Agency's (EPA) regulations and policies applicable to grants awarded under the Municipal Construction Grants Program. The problem of indentifying applicable regulations and policies arises most often at the time of audit, which may take place anywhere from five to ten or more years after initial grant award. When a construction grant project is completed and the grant ready for closing out auditors, Regional EPA, State and, at times, Corps of Engineer personnel are faced with task of reviewing and confirming (in some cases reconfirming) that costs incurred and claimed by grantees and paid by EPA are, in fact allowable for grant participation. This task can become quite burdensome recognizing that the statutes, regulations, policies and guidance administered by EPA changed significantly over the ten year span between 1972 and 1983 and, during that same period, more than 22,500 grants were awarded.