N.H. Admin. Code § Env-Ws 381.28

Current through Register No. 45, November 7, 2024

Section Env-Ws 381.28 - Monitoring For Lead and Copper In Source Water

(a) The owner of a water system failing to meet the lead or copper action level on the basis of tap samples collected in accordance with Env-Ws 381.15 through Env-Ws 381.21, shall collect lead and copper source water samples in accordance with the following requirements:

(1) A system owner using groundwater shall:

a. Collect a minimum of one sample at every entry to the distribution system which is representative of each well after treatment; and

b. Collect one additional sample at the location specified in a. above, unless conditions make another location more representative of each source or treatment plant; and

(2) A system owner using surface water shall:

a. Collect a minimum of one sample at every entry point to the distribution system after any application of treatment or in the distribution system at a point which is representative of each source or treatment; and

b. Collect each sample at the same location specified in (2)a. above, unless conditions make another location more representative of each source after treatment.

(b) If a system draws water from more than one source and the sources are combined before distribution, the system owner shall sample at an entry point to the distribution system during periods when water is representative of all sources being used.

(c) If the department determines that a water system may composite samples, such compositing shall be completed by an accredited laboratory or certified laboratory.

(d) The timing of sampling for lead and copper shall be in accordance with (h) below, and Env-Ws 381.29(a) and not the dates specified in Env-Ws 326.01 through Env-Ws 326.12.

(e) Where the results of sampling indicate an exceedance of maximum permissible source water levels established under Env-Ws 381.12, the system owner shall collect one additional sample at the same sampling point as soon as practicable but no later than 14 days from the date sample was collected.

(f) The results of the initial and confirmation sample shall be averaged in determining compliance with the department-specified maximum permissible levels.

(g) Any sample value below the detection limit shall be considered to be zero.

(h) A system owner exceeding the lead or copper action level at the tap shall collect one source water sample from each entry point to the distribution system within 6 months after the exceedance.

N.H. Admin. Code § Env-Ws 381.28

(See Revision Note at chapter heading for Env-Ws 300) #6521, eff 6-4-97, ss by #7734, eff 8-2-02; amd by #8351, eff 5-14-05; amd by #9598, eff 11-21-09