What is concrete washout and why does it require containment?

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Concrete washout refers to the water and slurry generated when cleaning concrete trucks, tools, mixers, and equipment after a pour. This waste contains highly alkaline compounds, heavy metals, and fine particulates that are toxic to soil, groundwater, and stormwater systems. Under the EPA's Clean Water Act and the National Pollutant Discharge Elimination System (NPDES), discharging concrete washout — or any construction-related wastewater — directly onto the ground or into storm drains is illegal. Proper containment is not optional; it is a federally required Best Management Practice (BMP) on virtually every regulated construction site.

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