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Drinking Water Source Protection Program
Groundwater Reclassification
There are four classes of groundwater in New
Hampshire as outlined in the NH Groundwater
Protection Act, RSA 485-C. Initially, all
groundwater in New Hampshire was classified as GB
or GA2, the two lowest classifications in terms of
protection. Groundwater reclassification designates
an area of groundwater for a higher level of
protection (GAA or GA1) because it contributes
groundwater to a public water supply or represents
an area of high value groundwater for present or
future water supply.
Groundwater reclassification is a process that
involves both the local entity - a water supplier
or municipality - and the NH Department of
Environmental Services. Through this process, a
local entity would inventory and manage potential
contamination sources through education and
inspections. Reclassification provides the local
entity with the authority to enforce BMP rules in
the protected area.
Statutes and Rules
Fact Sheets
Guidance
Program Staff
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