What is the numerical effluent limit at stormwater discharge locations?

The numerical effluent limit for turbidity at stormwater discharge locations is established to protect water quality and aquatic ecosystems. A limit of 280 NTU (Nephelometric Turbidity Units) is considered to be an appropriate threshold set under many regulatory frameworks, especially for stormwater discharges. This value helps ensure that the clarity of the water is maintained at a level that minimizes the adverse effects of sediment on aquatic life and habitat. Values higher than this limit may indicate excessive sediment loads, which can be detrimental to aquatic organisms and can contribute to pollution in receiving waters.

Understanding and adhering to this limit helps facility operators take appropriate measures to manage stormwater effectively and ensure compliance with environmental regulations.