Reference maps for the project are available in PDF.

Download Brewster's Water Resource Atlas here.

Proposed Brewster Board of Health Regulation

The Brewster Board of Health is meeting on September 21, 2016 to obtain public comments and input on a proposed regulation to improve the management of septic systems within close proximity to fresh water ponds. The proposed regulation is provided here. The map showing the properties under the jurisdiction of the regulation if adopted is provided here.

The figures below and supporting documentation are included in the Integrated Water Resources Management Plan Phase II Report

Map of Brewster’s Water Resources
Certain areas within Brewster’s watershed contribute groundwater or surface water to fresh water ponds or coastal estuaries. The IWRMP process recognizes that site specific analysis is needed for those areas that contribute groundwater to the Town’s public drinking water wells. These areas are known in Massachusetts as Zone IIs or wellhead protection areas. These watersheds and Zone II areas are a focus of some of the analysis documented in the Phase II report. Additional context is provided beginning on Page B-1 of the Phase II Report

Projected Sea Level Rise (SLR) for Brewster
This map illustrates potential impacts of SLR in Brewster’s watershed. The blue areas are those areas that would be affected by a SLR of three feet.  Areas near streams and hydraulically-connected ponds would be expected to have less than the predicted high groundwater table rise because of increased streamflow. Areas that will be most affected currently have moderately high groundwater, and the projected rise in groundwater levels from SLR pushes them into the impacted category. Additional context is provided beginning on Page D-37 of the Phase II Report.


Brewster Conservation Lands and Zone II Areas
This map shows the extent of conservation and protective land use practices in Brewster, including town-owned properties and other conservation easements, the Town’s District of Critical Planning Concern (DCPC) area, as well as Zone IIs to the Town’s public drinking water wells. A Zone II is the area of an aquifer which contributes water to a well under the most severe pumping and recharge conditions that can be realistically anticipated. Meeting water demand has not been an issue for the Town of Brewster due to the pro-active management of both its water system by the Brewster Water Department, and of the Town’s growth with a focus on conservation and resource preservation.  Additional context is provided beginning on Page E-40 of the Phase II Report.


Status of Brewster's Ponds
Brewster is home to approximately 80 fresh water ponds. Seventeen ponds, shown on this map, are considered impaired, requiring actions by the Town and by shoreline residents to restore them.  Current threats to the ponds are associated with phosphorus, the nutrient that feeds excess algae and plant growth in fresh water ponds. Sources include septic systems near pond shorelines, lawn fertilizers applied adjacent to the ponds (especially if applied right before it rains), and runoff from roads, driveways and parking lots. Historic agricultural activities may have contributed to degraded water quality as well. Additional context is provided beginning on Page G-88 of the Phase II Report.


Regulated Pond Setbacks for Brewster
This map shows parcels that are affected by the Board of Health regulations that specify a 300-foot setback distance for septic leaching fields around ponds. On the map, the light brown areas show the setback distance around ponds and the gray outlines show the parcel boundaries. The yellow areas show the parcels that are affected by the pond setback regulation. Additional context is provided beginning on Page G-92 of the Phase II Report.


MS4 Regulated Lands in Brewster
A MS4 permit is designed to reduce the amount of sediment and pollution that enters surface and groundwater from municipal storm sewer systems to the maximum extent practicable. Brewster’s current MS4 permit specifies particular actions that must occur on regulated lands, which are those so called “urbanized” areas by the 2000 U.S. Census. The regulated lands are shown on this map. These generally cover the northern and central sections of the Town. Additional context is provided beginning on Page F-67 of the Phase II Report.


Existing Inventory of Brewster’s Stormwater System
This map illustrates Brewster’s stormwater drainage structures including outfalls and catch basins. Flyover data indicated that there were at least 1,610 catch basins in the Town, but only about 817 of these are Town-owned, and therefore subject to the MS4 permit. Additional context is provided beginning on Page F-67 of the Phase II Report.


Additional Maps

Town of Brewster

Brewster Catch Basins
Brewster Depth to Groundwater
Brewster Flood Zones
Brewster Ponds Watersheds
Brewster Subwatersheds
Brewster Impervious Surfaces
Brewster Open Space
Brewster Ponds By Category
Brewster Ponds Volunteers Water Quality Sampling
Brewster Zone II
Brewster Zoning

Massachusetts Estuaries Project

MEP Study Areas in Brewster
Bass River Subwatersheds
Herring River Subwatersheds
Little Namskaket Creek Subwatersheds
Namskaket Subwatersheds
Pleasant Bay Subwatersheds
Swan Pond Subwatersheds

United States Geological Survey (USGS)

Sagamore-Monomoy Regional Water Table
Sagamore-Monomoy Flow Lenses

A full list of maps is available here.