Notwithstanding the maximum residual disinfectant levels (MRDLs) specified in Env-Dw 700, the O/O of a PWS subject to this part may increase the distribution system residual disinfectant levels of chlorine or chloramines, but not chlorine dioxide, pursuant to 40 CFR § 141.130(d).
N.H. Admin. Code § Env-Dw 715.04
#9619, eff 1-1-10 (See Revision Note #2 at chapter heading for Env-Dw 700)