Section Env-Dw 504.05 - Distribution System Flushing(a) The water system owner shall flush the distribution system at least once every 2 years, or more frequently if needed, so as to maintain the cleanliness of the distribution piping.(b) Flushing shall be done at times of minimum system usage whenever possible.(c) For systems serving less than 100 individuals, regardless of the number of customers, the owner shall give written notice at least one week in advance of the intended flushing date by first class mail, e-mail, or hand-delivery to all premises served by the system in the area that will be affected by the flushing.(d) For systems serving 100 or more individuals, regardless of the number of customers, the owner shall give notice at least one week in advance of the intended flushing date to all premises served by the system in the area that will be affected by the flushing by: (1) Written notice delivered by first class mail or hand-delivery;(2) E-mail or other electronic means such as reverse 911 telephone service;(3) Publishing a copy of the notice in a newspaper of general circulation for the area served by the system; or(4) Any combination of (1) through (3), above.(e) The flushing shall be continued until the water runs clear, at a flushing flow rate of not less than 2.5 feet per second.N.H. Code Admin. R. Env-Dw 504.05
(See Revision Note at part heading for Env-Dw 504) #10465, eff 12-2-13