The 03245 zip code area of Holderness, New Hampshire, carries a high environmental hazard designation due to proximity to active federal remediation zones. Currently, there is one Superfund location within five miles and two within ten miles of this community. The most immediate concern is the Gilford Fire Training site, located exactly 4.7 miles away. The Plymouth Street Area Site is also an active remediation zone located 7.25 miles away. The Environmental Protection Agency currently lists the primary contaminants at the Gilford Fire Training site as unspecified hazardous substances. In the context of fire training facilities, such substances typically involve synthetic firefighting chemicals or volatile organic compounds. Prolonged exposure to these chemical classes, primarily through groundwater migration, can adversely affect the human immune system, disrupt thyroid function, and increase the risk of certain cancers.

The Gilford Fire Training facility maintains an active National Priorities List status. This indicates that the EPA is conducting ongoing investigation, containment, or active remediation efforts to mitigate environmental migration, meaning the regional contamination threat is not yet fully resolved. Because federal remediation is still underway, residents relying on private wells should immediately schedule independent water testing through a state-certified laboratory to screen for volatile organic compounds and synthetic chemicals. Affected households should install reverse osmosis water filtration systems certified to remove microscopic chemical contaminants from drinking and cooking water. Furthermore, residents must avoid utilizing untested surface water for agricultural or recreational purposes until the EPA officially downgrades all these nearby sites to a resolved status.