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 382.16 - Compliance Determination for TTHM and HAA5

Universal Citation: NH Admin Rules Env-Ws 382.16

Current through Register No. 13, March 27, 2025

(a) For a system owner monitoring quarterly:

(1) Compliance with MCLs specified in Env-Ws 317.70 shall be calculated using a running annual average, computed quarterly, of quarterly averages of all samples collected by the system owner pursuant to Env-Ws 382.08; and

(2) If the running annual average of quarterly averages covering any consecutive 4-quarter period exceeds the MCL, the system owner shall:
a. Be deemed to be in violation of the MCL;

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

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

(b) For a system owner monitoring less frequently than quarterly:

(1) A system owner shall be in compliance with the MCL if the average of samples collected that year under Env-Ws 382.08 does not exceed the MCLs specified in Env-Ws 317.70; and

(2) If a system owner in (1) above, exceeds the MCL, the system owner shall increase monitoring to once per quarter per treatment plant.

(c) A system in (b) above shall not be in violation of the MCL until it has completed one year of quarterly monitoring unless the result of fewer than 4 quarters of monitoring will cause the running annual average to exceed the MCL.

(d) If the result of fewer than 4 quarters of monitoring will cause the running annual average to exceed the MCL, the system shall be deemed to be in violation of the MCL at the end of that particular quarter.

(e) A system owner required to increase monitoring frequency to quarterly pursuant to (b)(2), above shall:

(1) Calculate compliance by including the sample triggering the increased monitoring in addition to the following 3 quarters of monitoring; and

(2) If the running annual average of quarterly averages covering any consecutive 4-quarter period exceeds the MCL:
a. Be deemed to be in violation of the MCL and shall:

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

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

(f) If a system owner monitoring quarterly fails to complete 4 consecutive quarters of monitoring, compliance with the MCL for the last 4-quarter compliance period shall be based on an average of available data.

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

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