New Hampshire State Stormwater Needs Survey

A comprehensive assessment of the capital costs to assess the stormwater needs of New Hampshire.

How To Supply Information For The Survey

Your participation is needed for the New Hampshire State Stormwater Needs and EPA Clean Watersheds Needs Survey!

The New Hampshire Department of Environmental Services (NHDES) is collecting information on stormwater, hydromodification, and wastewater projects throughout New Hampshire for the 2022 Clean Watersheds Needs Survey (CWNS). Results of this survey are used by the U.S. Congress and New Hampshire state legislature in their budgeting efforts, including the allocation of federal grant and loan program funds to states. This effort combines the U.S. Environmental Protection Agency’s (EPA) CWNS – which focuses on capital costs for projects with a water quality benefit only – with New Hampshire State Stormwater Needs, which includes CWNS eligible projects plus additional non-eligible projects. 

Please help us bring more funds to New Hampshire’s municipalities by participating in the survey!

New Hampshire municipalities are being contacted to provide information for all wastewater, stormwater and hydromodification projects through documents such as Capital Improvement Plans, stormwater management plans, and unfunded grant and loan applications. Municipalities with populations under 10,000 without documentation are eligible to report projects! They will have an opportunity to fill out a survey form to document their needs.

The CWNS data is used to allocated funds back to the states through grant and loan programs, such as through the Clean Water State Revolving Fund (CWSRF) program.

As listed below, NHDES Wastewater Engineer Bureau will collect CWNS wastewater-related data and a NHDES consultant, Comprehensive Environmental, Inc. (CEI), will collect data related to stormwater and hydromodification projects. Find out more about the stormwater and hydromodification effort through CEI’s webpage.

Project Type Who you will hear from:

 Stormwater, such as:
           • green infrastructure
           • gray infrastructure
           • general stormwater management

 Hydromodification, such as:
           • dam removal and repair
           • stream bank restoration

CEI staff on behalf of the NHDES Watershed Management Bureau

 Wastewater, such as:
         • wastewater collection and treatment facilities
         • combined sewer overflows

 NHDES staff (Wastewater Engineering Bureau)

Survey Scope

The scope of CWNS is to capture all unfunded project(s) and associated capital costs that address a water-quality or water-quality-related public health problem existing as of January 1, 2022 and expected to occur within the next 20 years. The New Hampshire State Stormwater Needs Survey captures additional project data, including noncapital costs and projects without water quality benefits, such as for increasing capacity.

Municipalities with populations under 10,000 without documentation are eligible to report projects! They will have an opportunity to fill out a survey form to document their needs.

Example projects include (but not limited to):

for photos of project examples: stormwater infranstructure plans; a bulldozer implementing hydromodification; a rain garden; and a wastewater treatment plant.;

What is CWNS?

The EPA's CWNS is an assessment of the capital costs (“needs”) required to meet the water quality goals of the Clean Water Act to address water quality and water-quality-related public health concerns. These capital investment needs are reported periodically to Congress for all 50 states and territories. Although the CWNS assessment typically occurs every four years, the last assessment was completed in 2012, so participation in the 2022 survey is crucial to reflect up to date needs! That is why your participation is so critical now!

Purpose of the CWNS

EPA documents national and state needs in a Report to Congress and used by Congress and state legislatures in their budgeting efforts, such as the allocation of funds to states through grant and loan programs. The data are also used to help measure environmental progress, contribute to academic research, provide information to the public, and help local and state governments implement water quality programs. 

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Did you know?

Did you know?

CWNS is the only nationwide survey that collects this type of information in order to determine appropriate funding!

New Hampshire’s Unique Approach for Stormwater 

Once CEI has gathered available stormwater project and cost data for all municipalities that have it, they will use the EPA-approved New Hampshire State Specific Approach to generate costs for all remaining municipalities. This innovative method, first created by New Hampshire for the last CWNS in 2012, divides all state municipalities into five categories; calculates a rate per acre for each category based on municipalities within that category with eligible data; then applies that rate to the acreage in each remaining municipalities in that category. This will be done in 2022 for both reporting to EPA for CWNS and at the state level for the New Hampshire State Stormwater Needs effort. 

For more information about the stormwater and hydromodification portions of this survey, contact Lisa Loosigian at (603) 271-1190 or For more information about the wastewater portions of the survey, contact