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 1010 - SEPTIC TANKS
Section Env-Wq 1010.02 - Septic Tank Capacity for Commercial and Large Residential Structures

Universal Citation: NH Admin Rules Env-Wq 1010.02

Current through Register No. 13, March 27, 2025

The liquid capacity of a septic tank in an ISDS serving a commercial structure or a residential structure having more than 10 bedrooms shall be as follows:

(a) For flows of 300 GPD to less than 600 GPD, the septic tank size shall be the same as that specified in Env-Wq 1010.01(b);

(b) For flows of at least 600 GPD but less than 1,500 GPD, the volume shall be the greater of 1,250 gallons or 2 times the daily sewage flow;

(c) For flows of 1,500 GPD or more, the volume shall be 2,000 gallons plus 70% of the daily flow; and

(d) For flows of less than 300 GPD, the volume shall be not less than 1,000 gallons.

(See Revision Note at chapter heading for Env-Wq 1000) #9086, eff 2-9-08; ss by #9904-A, eff 4-16-11

Disclaimer: These regulations may not be the most recent version. New Hampshire may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.