Section Env-Dw 709.19 - Follow-up Testing for E. coli; Boil Orders(a) If any sample is positive for total coliforms, the PWS owner shall analyze, or request the laboratory to analyze, the total coliform-positive culture medium for E. coli.(b) If E. coli are present or the E. coli MCL is exceeded per Env-Dw 702.02(b), the PWS owner shall: (1) Issue a boil order advising all consumers that the water should be vigorously boiled for not less than 2 minutes before human consumption; and(2) Notify the department by the end of the work day in which the PWS owner is notified of the test result, unless the PWS owner is notified of the result after the department office is closed, in which case the PWS owner shall notify the department before noon on the next business day.(c) Boil order language shall: (1) Clearly explain the need to boil water vigorously for a minimum of 2 minutes prior to using the water for any purpose associated with human or animal consumption, which includes but is not limited to drinking, brushing teeth, washing vegetables, food preparation, dishwashing, making infant formula, or making ice;(2) Provide the name, title, and telephone number of the PWS contact who can address any questions or concerns; and(3) State that further notification will be issued when the boil order has been lifted.(d) Notification to PWS consumers of the boil order shall be in accordance with the public notification requirements for acute violations as specified in Env-Dw 800.(e) For all PWS, the PWS owner also shall post the boil order in a conspicuous place in areas frequented by the public, which shall include electronic postings such as on the home page of the internet site for the owner or PWS, if the owner or PWS has an internet site.(f) The PWS owner shall not lift the boil order unless:(1) A minimum of 2 consecutive sets of samples, collected at least 24 hours apart, show an absence of total coliforms and E. coli, where a set of samples consists of the greater of 3 samples or the number of routine samples required by Env-Dw 709.05, to a maximum of 10 samples, at sampling points identified in consultation with the department;(2) The department is satisfied that the PWS owner has undertaken all reasonable efforts to identify and correct the source of contamination, by conducting an inspection equivalent to a level II assessment and correcting all sanitary defects; and(3) The department notifies the PWS owner that the boil order may be lifted.N.H. Code Admin. R. Env-Dw 709.19
(See Revision Note #1 at chapter heading for Env-Dw 700) #9700, eff 5-1-10
Amended by Volume XXXV Number 06, Filed February 12, 2015 , Proposed by #10771, Effective 2/1/2015, Expires2/1/2025.