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 382.10 - Monitoring for Chlorite
Current through Register No. 13, March 27, 2025
(a) An owner of a community or non-transient noncommunity water system using chlorine dioxide for disinfection or for oxidation shall monitor for chlorite as follows:
(b) In addition to the daily sampling pursuant to (a) above, a system owner shall collect a 3-sample set once per month at each of the following locations in the distribution system:
(c) Any additional routine monitoring conducted at the system owner's discretion shall be conducted as 3-sample sets as specified in (b) above.
(d) A system owner may use the results of additional monitoring in (c) above to meet the monthly monitoring requirement in (b) above.
(e) After one year of monthly sampling, a system owner may submit to the department a written request to reduce the chlorite monitoring frequency in (b) above.
(f) The written request shall include:
(g) The department shall respond to the request in writing and decrease the monthly monitoring requirement to one 3-sample set per quarter if the department determines that:
(h) The system may remain on the reduced monitoring schedule unless:
(i) Additional routine monitoring conducted at the system owner's discretion shall be at the locations specified in (b) above.
(j) A system owner may use the results of additional daily monitoring conducted pursuant to (i) above to meet the required monthly monitoring of (b) above.
(k) Daily chlorite monitoring at the entrance to the distribution system as specified in this section shall not be reduced.
(See third Revision Note at chapter heading Env-Ws 300); #7735, eff 8-2-02