Rainwater harvesting is legal in Nashua. New Hampshire has no statute prohibiting residential rain barrels, cisterns, or roof-runoff capture, and NH DES actively promotes rain-barrel use through its Soak Up the Rain New Hampshire program. Nashua does not impose a permit on a simple downspout-fed rain barrel. Plumbed cisterns connected to building plumbing — particularly for indoor non-potable reuse — require permits from the Nashua Building Safety Department and must comply with the NH State Building Code (IPC Chapter 13 / Appendix C) and NH DES rules for backflow prevention on any cross-connection with the Pennichuck public water supply.
New Hampshire is a rainwater-friendly state with no statewide prohibition on capture or use of rooftop rainwater for landscape irrigation. NH DES runs the Soak Up the Rain New Hampshire (SOAK-NH) program, which actively promotes residential rain barrels, rain gardens, and other stormwater best management practices to protect surface waters including the Nashua River and the Merrimack River — both of which run through or border Nashua. The Pennichuck-served Nashua public water supply is a regulated system, so any plumbed cistern or rainwater system connected to the building's potable plumbing must include backflow prevention to protect the public supply, as required by NH DES Public Water System rules and the Pennichuck cross-connection control program. The NH State Building Code adopts the International Plumbing Code; IPC Chapter 13 (and Appendix C in older editions) governs non-potable rainwater systems and is enforced by the Nashua Building Safety Department for installation, inspection, and labeling. Routine downspout-to-rain-barrel installations with no connection to indoor plumbing do not require a Nashua permit. For larger plumbed systems used for flushing or laundry, a plumbing permit is required from Building Safety. NH DES also encourages cistern-fed drip irrigation for vegetable gardens, with caution against using harvested rainwater on edible portions of food crops without filtration.
There is no Nashua penalty for installing a rain barrel for outdoor garden irrigation. Plumbing a cistern into building plumbing without the required permit is a NH State Building Code / NH Plumbing Code violation enforced by the Nashua Building Safety Department with stop-work and after-the-fact permitting. Cross-connections that contaminate the Pennichuck public water supply trigger NH DES Public Water Supply enforcement and immediate utility action.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Nashua, NH
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