The answer to this is simple, yes it can be illegal, but you can take precautions to prevent it from being illegal. Wastewater created from the pressure washing equipment can have detergents and silt that areprobably harmful to the environment. It is an EPA violation and in many other places across the country, it does come with a local fine as well. The way to prevent any legal action against the homeowner or the pressure washing company here at CD Pressure Solutions we use a cleaner called EBC Cleaner. The EBC Cleaner is environmentally friendly and great for getting all the mildew mold and grease and oil from the surface your cleaning. If you want to know more about our services you can check out the other blog posts or our website here at CD Pressure Solutions. It has a lot of awesome information.