A Typical ERP Cycle
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
Figure 2 from EPA's 2007 ERP Report, at right, shows the steps in a typical cycle of ERP. No two ERPs are exactly alike, however, because states have adapted this approach for a wide variety of circumstances.
For instance, mandatory self-certification has been used to replace permitting in some ERPs. On the other hand, many states have successfully implemented ERPs with voluntary submission of self-certifications, when mandatory certification was not feasible. (In both cases, however, facilities are required to meet all compliance obligations.)
States are also experimenting with applying different combinations of a subset of ERP tools, depending upon the situation.