Todd ClarkBlogging BMPs, Education, Stormwater

Concrete wash water, produced when cleaning out concrete trucks, tools, or mixers, is one of the most common yet overlooked pollutants on construction sites. Both construction and agricultural operations that use cement-based materials can contribute to this issue. When the wash water is allowed to run off into the ground or storm drains, it can harm the environment and water quality in nearby ditches, streams, and lakes.

The main concern is the high pH level of concrete wash water—often greater than 12. This makes it highly corrosive and

Good Concrete Washout

Concrete Washout that has not been managed properly

The main concern is the high pH level of concrete wash water—often greater than 12. This makes it highly corrosive and harmful to plants, fish, and other aquatic life. When it enters waterways or seeps into the soil, it can change the natural balance of the environment, reduce vegetation growth, and damage infrastructure. Managing this material properly helps protect clean water, maintain healthy soil, and support long-term sustainability in both construction and agricultural settings.

PH Scale

PH Strip showing high alkalinity

Fortunately, there are simple and effective solutions to keep concrete wash water contained and treated before disposal:

  • Use designated washout areas lined or contained to prevent leaks or runoff.
  • Employ portable washout containers or systems that capture and store the wastewater for proper treatment.
  • Neutralize pH levels with approved treatment products before disposal.
  • Train workers on proper washout procedures and inspection routines.
  • Monitor and maintain washout areas to ensure they are not overflowing or leaking.

By taking these small but important steps, we can protect our local waterways, preserve soil health, and demonstrate a strong commitment to responsible construction and land management. For more information on Concrete Washouts and the multiple ways we can effectively manage wash water on construction sites, farms, and even homes, please visit our website at www.elkcoswcd.org and click the construction tab. We have a digital copy of the Elkhart County Field Office Technical Manual that provides guidance on this and many other Best Management Practices or BMP’s used to effectively manage erosion and sediment control.