New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Ws - Division of Water
Chapter Env-Ws 300 - NEW HAMPSHIRE DRINKING WATER RULES
Part Env-Ws 382 - DISINFECTANT/DISINFECTION BYPRODUCTS RULE
Section Env-Ws 382.12 - Monitoring for Disinfectant Residuals: Chlorine, Chloramine and Chlorine Dioxide
Current through Register No. 13, March 27, 2025
(a) An owner of a community or non-transient non-community water system using chlorine or chloramines shall conduct routine monitoring for chlorine or chloramines by measuring residual disinfectant levels at the same time and at the same points in the distribution system as total coliform samples are collected as specified in Env-Ws 325.
(b) In lieu of collecting separate samples, a SW/GWUDISW system owner may use the results of residual disinfectant concentration sampling conducted as follows:
(c) An owner of a community, non-transient non-community, or transient non-community water system using chlorine dioxide for disinfection or for oxidation shall collect at least one routine sample per day at the entrance to each distribution system.
(d) For any daily sample that exceeds the chlorine dioxide MRDL specified in Env-Ws 317.80, the system owner shall:
(e) Chlorine, chloramines, and chlorine dioxide monitoring shall not be reduced.
(See third Revision Note at chapter heading Env-Ws 300); #7735, eff 8-2-02