Environmental Rules in New Hampshire (2026)
15 rules on the books across New Hampshire, 3 cities and counties. Select a rule to read the full details.
Severity: Few Restrictions · Light Restrictions · Some Restrictions · Significant Restrictions · Heavy Restrictions
Stormwater Management
Requirements for managing rainwater runoff on your property, including retention basins, permeable surfaces, and drainage plans.
New Hampshire: statewide
StatewideHeavy RestrictionsNew Hampshire RSA 485-A:17 requires state Alteration of Terrain (AoT) permits from NHDES for projects disturbing…
Read full rule →Hudson
Some RestrictionsHudson's Planning Board regulates land-disturbing development under Chapter 290, Stormwater Management, requiring a…
Read full rule →Manchester
Some RestrictionsManchester requires anyone starting land-disturbing site work, grading, or construction to file an EPA Notice of Intent…
Read full rule →Nashua
Some RestrictionsNashua requires stormwater management and erosion control plans for subdivision and site plan applications, with…
Read full rule →Erosion Control
Rules to prevent soil erosion during construction and landscaping, including required sediment barriers and ground cover standards.
New Hampshire: statewide
StatewideHeavy RestrictionsNew Hampshire RSA 485-A:17 and shoreland protection laws require erosion and sediment controls during land disturbance…
Read full rule →Hudson
Some RestrictionsIn the Town of Hudson, New Hampshire, any site subject to Site Plan Review or Subdivision Regulations must follow…
Read full rule →Nashua
Some RestrictionsNashua requires an administrative permit before loam, clay, sod, sand or gravel can be excavated and hauled off a site…
Read full rule →Coastal Development
Building restrictions near coastlines, including setbacks from the water, dune protection rules, and coastal commission permits.
Flood Zones
Building requirements for properties in FEMA flood zones, including elevation standards, flood insurance mandates, and construction limits.
Hudson
Significant RestrictionsThe Town of Hudson, New Hampshire requires a floodplain permit from the Town Engineer for any development in a…
Read full rule →Manchester
Some RestrictionsManchester's on-site sewage disposal code prohibits building new septic systems in flood-prone areas designated on the…
Read full rule →Nashua
Some RestrictionsNashua requires a permit for any development in a FEMA-mapped special flood hazard area, and new construction or…
Read full rule →Vehicle Idling Restrictions
Limits on how long heavy-duty vehicles, buses, and passenger cars may idle, including bans near schools and residential areas.
Hudson
Some RestrictionsIn the Town of Hudson, New Hampshire, the noise ordinance caps engine idling on standing vehicles over 10,000 pounds…
Read full rule →Nashua
Some RestrictionsNashua prohibits trucks over 18,000 pounds from idling more than 15 minutes between midnight and 6 a.m. in residential…
Read full rule →Flood Elevation Requirements
FEMA NFIP minimum base flood elevation (BFE) construction standards for properties in mapped flood zones, including freeboard requirements above BFE.
Hudson
Some RestrictionsIn the Town of Hudson, New Hampshire, any development in a special flood hazard area needs a floodplain permit from the…
Read full rule →Nashua
Some RestrictionsNew and substantially improved homes in Nashua flood zones must sit at least one foot above the 100-year flood…
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