There are three AIM levels: Level 1, Level 2, Level 3.

AIM is triggered by an exceedance of a benchmark monitoring parameter, which can occur from two 'triggering events', either 1) an exceedance of the four-quarterly annual average for a parameter or 2) fewer than four quarterly samples if a single sample of the sum of any sample results within the sample year exceeds the benchmark threshold by more than four times the parameter (indicating that an exceedance of the annual average is certain). This dataset provides data related to facilities that have triggered Additional Implementation Measures (AIM) as described in Part 5.2 of the 2021 MSGP. The MSGP covers stormwater discharges associated with industrial activities where EPA is the permitting authority. The data refresh date is indicated in the file name on the data download page. State Review Framework Tracker RecommendationsĮCHO incorporates EPA's Multi-Sector General Permit (MSGP) Additional Implementation Measures (AIM) data in the Industrial Stormwater Facility Search.EPA/State Dashboards (Air, Wastewater, Drinking Water, Hazardous Waste, Pesticides).Quarterly NPDES Noncompliance Report Search.Wastewater/Stormwater/Biosolids Facility Search.

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