In addition, on January 27, 2010 the Agency built obtainable to the general public for comment its draft proposed 810.2000 Series Product Performance Guidelines which integrated draft proposed tips for disinfectant treatment method of hard surfaces. In 1998, the Office of Water (OW) working with the Office of Pesticide Programs (OPP) founded a most residual disinfectant stage (MRDL) of four. mg/L (ppm) for chlorine (40 CFR 141.