![]() Rainwater polluted with concrete wash water can percolate down through the soil and alter the soil chemistry, inhibit plant growth, and contaminate the groundwater. The safe pH ranges for aquatic life habitats are 6.5 – 9 for freshwater. Caustic wash water can harm fish gills and eyes and interfere with reproduction. In comparison, Drano liquid drain cleaner has a pH of 13.5. It’s also caustic and corrosive, having a pH near 12. Environmental and Human Health Impacts Concrete washout water (or wash water): is a slurry containing toxic metals.
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