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 381 - CORROSION CONTROL TREATMENT, LEAD AND COPPER ACTION LEVELS
Section Env-Ws 381.32 - Invalidation of Lead or Copper Tap Water Samples

(a) A sample invalidated under this section shall not be used:

(b) The department shall invalidate a lead or copper tap water sample if:

(c) A water system owner shall report to the department the results of invalidated samples and supporting documentation for samples the system believes should be invalidated.

(d) To invalidate a sample under (b) above, the decision and the rationale for the decision shall be documented to the department in writing. The department shall not invalidate a sample solely on the grounds that a follow-up sample result is higher or lower than that of the original sample.

(e) A water system owner shall collect replacement sample(s) for any sample(s) invalidated under this section if, after the invalidation of one or more samples, the system has too few samples to meet the minimum requirements of Env-Ws 381.17.

(f) A water system owner shall collect any such replacement sample(s) in (e) above, as soon as possible, but no later than 20 days after the date the department invalidates the sample or by the end of the applicable monitoring period, whichever occurs later.

(g) Replacement samples collected after the end of the applicable monitoring period shall not be used to meet the monitoring requirements of a subsequent monitoring period.

(h) A water system owner shall collect replacement samples at the same locations as the invalidated samples or, if that is not possible, at locations other than those already used for sampling during the monitoring period.