N.H. Code Admin. R. Env-Dw 709.22

Current through Register No. 25, June 20, 2024

Section Env-Dw 709.22 - Coliform Assessment Triggers and Required Actions

(a) A PWS owner shall conduct an assessment in accordance with Env-Dw 720.07 if an assessment is triggered as specified in (b) or (c), below.

(b) The level I assessment shall be triggered if:

(1) For a system collecting fewer than 40 samples per month, the system has 2 or more total coliform-positive samples in the same month;

(2) For a system collecting 40 or more samples per month, more than 5.0% of the samples collected during a month are total coliform-positive; or

(3) The system fails to take every required repeat sample after any single total coliform-positive sample result.

(c) The level II assessment shall be triggered if:

(1) An E. coli MCL violation as specified in Env-Dw 702.02 occurs; or

(2) A second level I assessment is triggered within 12 months of a prior level I or level II assessment, unless the department has:

a. Identified a likely reason that the samples that caused the first level I treatment technique trigger were total coliform-positive; and

b. Determined that the owner has corrected the problem.

N.H. Code Admin. R. Env-Dw 709.22

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