By State › New Hampshire

New Hampshire: Laws & Legal Considerations

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Rainwater harvesting: unrestricted and actively promoted

New Hampshire places no restriction on outdoor rainwater harvesting and actively promotes it through a dedicated state program.

RuleNew Hampshire
Source water Rooftop or other catchment
Permit required No, for outdoor applications
State program 'Soak Up the Rain,' run by the Department of Environmental Services, promotes rain barrels and similar water conservation practices

Where to find it: the New Hampshire Department of Environmental Services (des.nh.gov) runs Soak Up the Rain.

Water rights: reasonable-use riparian doctrine, under real strain

New Hampshire follows the reasonable-use version of riparian rights inherited from English common law: a landowner may use adjacent water so long as it doesn’t unreasonably interfere with another owner’s use, regardless of which use came first.

ConceptHow it works in New Hampshire
Basic rule Riparian landowners may make reasonable use of adjacent water; conflicts are resolved by reasonableness, not by priority date
Groundwater Separately addressed under the state's Groundwater Protection Act
Known strain Legal commentary has flagged that population growth and declining freshwater availability may eventually require modifying the reasonable-use system or introducing some form of allocation, though no such change has been enacted

Where to find it: the New Hampshire Department of Environmental Services administers groundwater rights.

Permitless carry since 2017

New Hampshire has recognized permitless (constitutional) carry since February 2017.

RequirementDetail
Standard Permitless carry, open or concealed, for anyone 18+ legally eligible to possess a firearm
Optional License to Carry (LTC) Still issued to residents and non-residents on request, unchanged by the 2017 law, mainly useful for reciprocity while traveling

A real, if not yet resolved, water-law tension

New Hampshire’s water law hasn’t hit a crisis point the way some Western prior-appropriation states covered on this site have, but legal commentary has specifically flagged reasonable-use riparian doctrine as potentially inadequate for a state with rising population and finite freshwater. Worth watching, not yet an active constraint.

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