The Lamprey is classified by the NH Legislature as a Class B (swimmable, fishable) river, and the state is thus required to maintain "fishable and swimmable" conditions as defined under the federal Clean Water Act. Water quality in the Lamprey River is generally very good. During the warm days of summer, however, the river’s current can be slow-moving with lower flows. In addition, it has several areas that are pond-like. These factors make the river vulnerable to pollution.
To view a brief summary of test results for 2012-2013, please click here.