Stormwater Sampling (Quarterly, Semi-Annual, Annual)

Stormwater sample collection is the process of gathering samples of stormwater runoff from a facility to test for the presence of pollutants. The samples are collected at specific locations, such as outfall pipes, and either (a) visually evaluated, or (b) analyzed in a laboratory to determine the levels of pollutants present in the stormwater.

The process of stormwater sample collection is critical for facilities that fall under the National Pollutant Discharge Elimination System (NPDES) stormwater permitting program, as it is a requirement for monitoring and reporting on the quality of stormwater runoff. The samples are collected according to specific protocols and guidelines set by the Environmental Protection Agency (EPA) and the authorized states or tribes.

The main goal of stormwater sample collection is to determine the quality of the stormwater runoff and identify any pollutants that may be present. The results of the analysis can be used to determine compliance with NPDES permit requirements, identify potential sources of pollution, and evaluate the effectiveness of best management practices (BMPs) implemented to control pollutants.

By regularly collecting and analyzing stormwater samples, facilities can ensure compliance with regulations, identify and correct non-compliant areas, implement best practices, and protect surface waters and groundwater from pollutants. Regular sample collection is important in maintaining a good reputation and avoiding penalties and fines.