Editing Wastewater contaminant overflow load (section)

== Monitoring and Measurement ==
Monitoring of wastewater contaminant overflow load relies on a combination of facility discharge reporting and receiving-water accounting. Facilities equipped with flow meters and pollutant sensors report discharge volumes and concentrations during overflow events. Online monitoring technologies, such as automated β-D-glucuronidase activity assays, have been developed to detect microbial contamination associated with combined sewer overflows. Additionally, water quality sampling in receiving waters assesses pollutant concentrations and helps estimate contaminant loads through mass balance approaches.

Institutions such as the U.S. Geological Survey ([https://en.wikipedia.org/wiki/United_States_Geological_Survey USGS]) and the Environmental Protection Agency ([https://en.wikipedia.org/wiki/United_States_Environmental_Protection_Agency EPA]) conduct studies and maintain datasets on overflow events and pollutant loads. Advances in real-time monitoring and tracer studies improve the temporal resolution and accuracy of load estimations. These methods collectively support annual quantification of contaminant mass discharged during overflow episodes.

Within the SIGNAL system, this phenomenon is treated as a defined environmental signal whose boundaries and measurement conventions are described below.