N.H. Admin. Code § Env-Dw 709.20

Current through Register No. 50, December 12, 2024

Section Env-Dw 709.20 - Relief from Boil Order Requirements

(a) If E. coli are present only in specific, hydraulically-isolated segments of a PWS service area, a PWS owner may submit a written request to the department to approve a boil order that is limited to customers in the service areas that are directly affected.

(b) The department shall approve a request submitted pursuant to (a), above, if it agrees with the PWS owner's assessment that the affected area is hydraulically isolated.

(c) The owner of a PWS may submit a written request to the department to waive the requirement to issue a boil order if the PWS owner:

(1) Has submitted a minimum of 3 routine total coliform samples per month for bacteria analysis;

(2) Was notified that only one sample in the sampling set shows the presence of E. coli and all other samples in the set show an absence of total coliforms;

(3) Concludes, based on an inspection performed by the system's primary certified operator immediately after being notified of the detection, that there are no apparent causes for the detection of E. coli;

(4) If applicable, has provided continuous treatment of all active water sources by addition of a chemical disinfectant during the 30 days prior to the samples that tested positive and has continuously maintained detectable disinfectant residuals at all times and locations for at least the prior 6 months, as verified by monitoring performed under Env-Dw 715; and

(5) Submits the written request to waive the boil order requirement within 4 hours of receiving notice from the department that a boil order is required.

(d) The department shall waive the requirement to issue a boil order if it determines that all of the requirements specified in (c), above, have been met, subject to the following conditions:

(1) The PWS owner shall:

a. Take repeat samples as specified in Env-Dw 709.15 within 6 hours of being notified of the positive result; and

b. Submit the sample results showing the absence of total coliforms and E. coli to the department within 24 hours of taking the samples; and

(2) The department shall inspect the PWS within 24 hours of initial notification, focusing on the effectiveness of the disinfection process and the circumstances of the samples that initially indicated the presence of E. coli.

(e) The department shall require the PWS to issue a boil order within 12 hours of notification if the system fails to comply with the conditions specified in (d)(1), above, or the department's inspection pursuant to (d)(2), above, identifies a possible cause of the initial indication of fecal coliforms or E. coli.

N.H. Admin. Code § Env-Dw 709.20

Derived From Volume XXXV Number 06, Filed February 12, 2015 , Proposed by #10771, Effective 2/1/2015, Expires2/1/2025.