New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Dw - Drinking Water Programs
Chapter Env-Dw 400 - PUBLIC WATER SYSTEM CLASSIFICATION AND DESIGN
Part Env-Dw 402 - GENERAL DESIGN STANDARDS: SYSTEMS SERVING 1,000 OR MORE PEOPLE
Section Env-Dw 402.06 - Treatment of Contaminants by Flow Mix
Current through Register No. 13, March 27, 2025
(a) For the purpose of this section, "flow mix" means a treatment technique where the flow of water from one or more sources having a particular contaminant exceeding an MCL is combined with flow from one or more different sources with that contaminant below the MCL, so that the resultant flow is reliably and consistently below the MCL for that contaminant.
(b) The owner of a public water system shall use flow mix as a treatment alternative only:
(c) Before beginning the design of a flow mix treatment system, the water system owner shall:
(d) The department shall approve the use of flow mix if the information submitted pursuant to (b), above, demonstrates that when the sources are combined at the correct ratio, the concentration level of the contaminant proposed to be treated by flow mixing will be reliably and consistently below the applicable MCL.
(e) The equipment used to verify and document proper flow mix treatment shall include:
(f) The owner shall submit, on a quarterly basis:
(g) A water quality sample shall be taken and analyzed:
(See Revision Note at part heading for Env-Dw 402) #10609, eff 6-1-14