Statewide Private Well Sampling Initiative

The primary purpose of the Statewide Private Well Sampling Initiative is to provide information to homeowners about the quality of their drinking water and when necessary, steps that can be taken to improve water quality.

The sampling is being paid for through a grant from the Drinking Water and Groundwater Trust Fund.

State officials and scientists will also use this information to evaluate the occurrence, concentration and sources of certain emerging contaminants in drinking water including perchlorate, 1,4-dioxane, PFAS and pesticides and their breakdown products. Additionally, this sampling program will provide the first statewide assessment of bacteria, nitrate, lead, fluoride, manganese, arsenic, radionuclides and salt in water obtained from private wells, and it will build upon previous statewide assessments that have been conducted on other contaminants such as arsenic and radon.

This information will be used to develop and implement strategies to mitigate and prevent exposures to unsafe levels of contaminants in drinking water obtained from private wells. NHDES will analyze the sampling results working with stakeholders and the public and publish the results by fall of 2021.


500 private wells were randomly selected statewide, and sampled for over 250 chemicals and parameters including volatile organic compounds, metals, radionuclides, per- and polyfluoroalkyl substances (PFAS) and pesticides. All of the private wells have already been identified for sampling; NHDES is not accepting requests to participate in the study.

Collaboration with New Hampshire Health and Human Services

Another aspect to the Drinking Water and Groundwater Trust Fund Statewide Private Well Sampling Program is targeted sampling and analysis of water from households that were randomly selected to participate in the 2019 New Hampshire Tracking and Assessment of Chemical Exposures (TrACE) Study. This biomonitoring study includes testing blood and urine from people for many of the same chemicals being analyzed in water. This collaboration will provide information about the relationship between chemicals measured in drinking water and in the bodies of study participants (




Private Well Sampling Work Plan

May 2019 Presentation at NHDES Source Water Protection Conference

Summary of Sample Results to Date

“Be Well Informed” – Understanding Water Test Results and Treatment Choices

Private Well Testing Program

Drinking Water Factsheets

For additional information, please contact Brandon Kernen, NHDES at (603) 271-0660.