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New Hampshire Department of Environmental Services
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Stormwater Management for Homeowners

Over 90% of the water pollution problems in New Hampshire are caused by stormwater runoff from the roads we travel, the buildings and parking lots we visit, and even the homes in which we live. Every single property has the potential to contribute to water pollution. Every property owner can also be part of the solution to water pollution. NHDES created a comprehensive guidance document and a hands-on voluntary program to assist New Hampshire home and small business owners in reducing water pollution.

New Hampshire Residential Loading Model

The New Hampshire Department of Environmental Services has created a modeling tool for homeowners to estimate their nutrient footprint call The New Hampshire Residential Loading Model.

This model is based on the Center for Watershed Protection’s Runoff Reduction Method. It is designed for property owners to estimate the loading of nutrients, specifically phosphorus and nitrogen, running off of their properties. This model can be used to:

  1. Calculate a property’s phosphorus or nitrogen “footprint”, which is how much phosphorus or nitrogen a property contributes to the watershed in which it is located.
  2. Calculate the benefit of installing LID practices on a property.
  3. Compare the existing and planned future conditions of a property with different stormwater treatment scenarios. For example, to estimate the impact that building a garage or the impact that constructing a rain garden on your property would have on nutrient loading.
  4. Determine if a property meets a targeted nutrient goal or nutrient reduction for its watershed, if a target goal or reduction has been set.

New Hampshire Residential Loading Model Microsoft Excel Symbol

Web-based Version The Winnipesaukee Gateway adapted the NH Residential Loading Model to create a web-based interactive spread sheet.

New Hampshire Residential Loading Model Instructions Adobe Acrobat Reader Symbol

Adobe Acrobat Reader Symbol Adobe Acrobat Reader format. Download a free reader from Adobe.

Microsoft Excel symbol Microsoft Excel format. Download a free viewer from Microsoft.




NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

copyright 2016. State of New Hampshire