New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Ws - Division of Water
Chapter Env-Ws 300 - NEW HAMPSHIRE DRINKING WATER RULES
Part Env-Ws 373 - DESIGN STANDARDS FOR NON-COMMUNITY WATER SYSTEMS
Section Env-Ws 373.19 - Appurtenances and Installation of Storage Tanks

(a) All water storage tanks at all non-community water systems shall have drains. All water storage tanks installed outdoors shall be totally backfilled to minimize damage to the tank coating. Water storage tanks shall be located above the seasonal high ground water table to prevent possible flotation when empty. Proposals to bury the water storage tank into or below the water table shall not be accepted.

(b) All atmospheric water storage tanks shall have a downward-turned "U" vent with fine mesh screening to prevent the entry of small living things such as insects, small animals, and birds.

(c) All buried steel water storage tanks shall be installed in accordance with current industry practice and be provided with an adequate underdrain system to assure that the seasonal high ground water table remains below the bottom of the water storage tanks, and have a protective coating inside and out. The interior coating shall be certified as being manufactured and applied in accordance with the approved listings in Env-Ws 305. Damage to the exterior coating during construction shall be repaired prior to tank backfill.

(d) All water storage tanks, larger than 500 gallons and installed after January 1, 1996 shall have a name plate identifying the following:

(e) Atmospheric water storage tanks shall be equipped with a capped filler pipe, which shall be lockable if located on the exterior of the tank, to accommodate tank truck water delivery. Atmospheric water storage tanks existing as of January 1, 1996 shall have filler pipes installed by January 1, 2007.