New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Wq - Water Quality and Quantity Programs
Chapter Env-Wq 1000 - SUBDIVISIONS; INDIVIDUAL SEWAGE DISPOSAL SYSTEMS
Part Env-Wq 1008 - DESIGN REQUIREMENTS FOR ALL SYSTEMS
Section Env-Wq 1008.02 - System Capacity; Number of EDAs; Minimum Design Flow
Current through Register No. 13, March 27, 2025
(a) The maximum allowable design capacity for an ISDS without a groundwater discharge permit as required under RSA 485-A:13 or RSA 485-C shall be 20,000 GPD.
(b) A system with design capacity of at least 2,500 GPD but no more than 5,000 GPD shall have at least 2 EDA separated by at least 10 feet, provided that the EDA may be a single field if a mounding analysis is submitted to show that the applicable separation distance to SHWT will be maintained.
(c) A system with a design capacity of more than 5,000 GPD shall have at least 2 EDA that are:
(d) No ISDS shall be designed to accommodate a sewage flow of less than 300 GPD, whether for commercial or non-commercial uses.
(See Revision Note at chapter heading for Env-Wq 1000) #9086, eff 2-9-08