1. (a) A septic tank may be replaced without department approval only if:

   1. (1) The existing septic tank is replaced with one or more tanks of the same liquid capacity or larger that meets the required tank capacity in Env-Wq 1010.01 and Env-Wq 1010.02;
   2. (2) The septic tank complies with Env-Wq 1010.03 through Env-Wq 1010.10;
   3. (3) The replacement tank is installed in the location of the existing tank so that no waiver to any setback is needed;
   4. (4) The ISDS does not need to be repaired or replaced, as defined in Env-Wq 1002; and
   5. (5) The replacement tank serves a single family residence or multi-unit residential structure with up to 12 bedrooms and is installed by a permitted installer, except a homeowner may replace the tank for the homeowner’s own domicile in accordance with RSA 485-A:36, II(a).
2. (b) Any septic tank(s) reused, replaced, or added as part of a replacement ISDS shall be shown on the plans submitted with the application.
3. (c) If below-grade plumbing fixtures are to be connected to an existing state-approved ISDS, amended plans shall be submitted as specified in Env-Wq 1004.07 if the liquid capacity of septic tank is required by Env-Wq 1010.01(n) to be increased and a septic tank is added or a single-compartment septic tank is replaced with a multi-compartment septic tank.

Source. (See Revision Notes #1 and #2 at chapter heading for Env-Wq 1000) #11184, eff 10-1-16; ss by #14486, eff 2-1-26, EXPIRES: 2-1-36