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 382.19 - Compliance Determination for Chlorine, Chloramine, and Chlorine Dioxide

Universal Citation: NH Admin Rules Env-Ws 382.19

Current through Register No. 13, March 27, 2025

(a) Compliance with chlorine and chloramine shall be as follows:

(1) Compliance shall be based on a running annual average, computed quarterly, of monthly averages of all samples collected by the system owner pursuant to Env-Ws 382.12; and

(2) If the average covering any consecutive 4-quarter period exceeds the MRDL, the system owner shall be:

a. Deemed to be in violation of the MRDL;

b. Notify the public pursuant to Env-Ws 351; and

c. Report to the department pursuant to Env-Ws 382.21.

(b) If a system changes between the use of chlorine and chloramines for residual disinfection during the year, compliance shall be determined by including all monitoring results for both chlorine and chloramines.

(c) Reports submitted pursuant to Env-Ws 382.21 shall clearly indicate which residual disinfectant was analyzed for each sample.

(d) Compliance with chlorine dioxide shall be based on consecutive daily samples collected by the system owner pursuant to Env-Ws 382.12(c).

(e) An acute violation for chlorine dioxide shall occur when:

(1) Any daily sample collected at the entrance to the distribution system exceeds the MRDL; and

(2) One or more of the 3 samples collected in the distribution system pursuant to Env-Ws 382.12(d) exceed the MRDL.

(f) A system owner in (e) above, shall:

(1) Immediately take corrective action to lower the level of chlorine dioxide below the MRDL;

(2) Notify the public pursuant to Env-Ws 351 using the procedures for acute health risks specified in Env-Ws 351.03; and

(3) Report to the department pursuant to Env-Ws 382.21.

(g) The failure to collect the 3 sample-set as specified in Env-Ws 382.12 in the distribution system the day following an exceedance of the chlorine dioxide MRDL at the entrance to the distribution system shall be deemed an acute violation.

(h) A system owner in (g) above shall:

(1) Notify the public in accordance with the acute violation public notice as specified in Env-Ws 351.03; and

(2) Report to the department pursuant to Env-Ws 382.21.

(i) A nonacute violation for chlorine dioxide shall occur when:

(1) Any 2 consecutive daily samples collected at the entrance to the distribution system exceed the MRDL; and

(2) All distribution system samples collected are below the MRDL.

(j) A system owner in (i) above shall:

(1) Take corrective action to lower the level of chlorine dioxide below the MRDL at the point of sampling;

(2) Notify the public using the procedures for nonacute health risks specified in Env-Ws 351.04 and Env-Ws 351.05; and

(3)Report to the department pursuant to Env-Ws 382.21.

(k) If the system fails to monitor for chlorine dioxide at the entrance to the distribution system the day following an exceedance of the chlorine dioxide MRDL at the entrance to the distribution system as specified in Env-Ws 382.12(d)(1), the system shall be deemed to be in violation of the MRDL.

(l) The system owner in (k) above, shall:

(1) Notify the public of the violation using the provisions for nonacute violations specified in Env-Ws 351.04 and Env-Ws 351.05; and

(2) Report to the department pursuant to Env-Ws 382.21.

(See third Revision Note at chapter heading Env-Ws 300); #7735, eff 8-2-02

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