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New Hampshire Department of Environmental Services

Source Assessment Reports
NHDES established its Drinking Water Source Assessment Program as part of its Drinking Water Source Protection Program to help improve protection of public water supply sources. The DWSAP did this by providing information about the vulnerability of each of the approximately 2,950 public water supply sources in the state. This information was provided in the form of assessment reports (one for each public water supply source) to public water suppliers and the general public between 2000 and 2003. While NHDES was required by the Federal Safe Drinking Water Act Amendments of 1996 to have this program, it did have some discretion as to how the information was gathered to prepare the assessment reports. NHDES's approach, described in detail in its DWSAP Plan, was approved by the USEPA in May 1999.

Drinking Water Source Assessment Program Plan Adobe Acrobat Reader Symbol

The online Source Assessment Reports consist of three parts. Part 1 is a table for each town showing the vulnerability determinations for the source(s) serving public water system(s) based in that particular town. Part 2 is an explanation of how the assessments were prepared and what they mean. Part 3 allows you to view maps of assessment areas.

Part 1: Viewing an Assessment Table by Town

Part 2: View an Explanation of the Assessments
The following documents provide additional information to help you understand why these assessments were done and the meaning of the susceptibility rankings. Which explanation you should view (non-transient or transient) depends on the type of system with which you are concerned.

The "Explanation for Non-transient Systems" provides information for understanding systems that serve towns, apartment complexes, mobile home parks, schools, day care centers, or other facilities where people are generally exposed to the water day after day. The "Explanation of Transient Systems" applies to systems that serve restaurants, campgrounds, or other facilities where people are generally exposed to the water for brief, often one-time, encounters.

If you are unsure which explanation (transient or non-transient) applies to the system with which you are concerned, please view the town report for that system in Part 1 and find the field marked "System Type." Type "C" and "P" systems are non-transient and type "N" systems are transient.

Part 3: View an Assessment Map
The maps that accompanied the assessment reports can be recreated online and viewed using NHDES’s OneStop Data Mapper and following these directions Adobe Acrobat Reader Symbol. In the interest of Homeland Security, some of the information needed to recreate the maps is only available to Registered Users.

Summary of Results
To see how the assessment results for any particular water system compare with New Hampshire averages, please see the following summaries of results:



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