In the U.S. we use the term ...
Published by Bob Foerster, Executive Director at Nevada Rural Water Association
In the U.S. we use the term residual chlorine, which includes all remaining after contact time, both free HOCl, OCl- and combined, monochloramine, if used. Free + combined = Total. Please lets stick to one term and not use 'excess.' U.S. limits the residual to 4.0 mg/L and anything in excess of that would indeed be excessive.