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MassDEP Online Map Viewer
Priority Resource Map

Priority Resource Map Layers

See links below for detailed documentation on the data layers displayed on this map.

Priority Resource Map

The MassDEP Priority Resource Map displays environmental data suitable for conducting a Phase 1 Site Assessment as required by MassDEP under the Massachusetts Contingency Plan or MCP (310 CMR 40.0000), which sets out the requirements for reporting, assessing and remediating contaminated sites.

The information shown on this map comes from many different sources and was developed at different scales. Some data may not be complete, some generalization may occur, and some information may not have been field verified.

The operational layers shown on this map are scale sensitive and will only draw when the map viewer is zoomed in to an appropriate,large scale. At smaller scales only the underlying base map will be displayed.

The operational layers are provided by the Massachusetts Office of Geographic Information (MassGIS) Geospatial Web Services. Base maps are provided by Bing, OpenStreetMap (OSM) and MassGIS.

Using the Online Map Viewer

The Map Tools allow the user to navigate and interact with the map. A map tool can be initiated by clicking on the icon in the map tool panel. A solid red outline surrounding the tool icon indicates that the tool is active. A series of buttons below the tool bar provide additional information about the map.

Map Tools

Select the Zoom in tool to zoom the map in to a larger scale. You may either click on a single spot on the map to zoom in one zoom level or zoom to a general area by clicking and dragging the cursor to create a selection box around your area of interest. Since the map uses preset zoom levels the resulting extent will be the closest preset zoom level to your chosen area. The Zoom in tool automatically recenters the map display on the selected point or the center of the selection box.

Click the Zoom out tool to zoom the map out one zoom level.

Select the Pan map tool, then click and drag the map (pan) in any direction.

Click the Zoom to full extent tool to zoom the map out to the maximum extent. This will return the map display to the default extent of the State of Massachusetts.

Click the Go to previous extent tool to return the map back to a previously viewed extents.

Click the Go to next extent tool to zoom the map forward to previously viewed extents.

The Zoom to address tool opens a dialog box on the map. Enter a complete street address (example: 1 Winter St Boston, MA 02108) into the dialog box (please include municipality and zipcode), then click Submit. A pop-up window will appear with the address search results and a score indicating locational quality. The higher the value the higher the confidence in locational accuracy. Click a Zoom button next to the address to zoom the map to that address result.
An address marker will appear on the map indicating the estimated location of the address. To remove the marker from the map, click the Clear button in the lower right corner of the Zoom to Address window.

The Zoom to town tool opens a combo box containing a list of the 351 Massachusetts municipalities. when a municipality is selected from the list the map will zoom to the approximate center of the municipality.

The Map Transparency tool opens a pop-up window with a slider control. Move the slider control to adjust the opacity (transparency) level of the operational layer(s). Reducing the opacity of operational layers will allow you to view the underlying base map. Closing this window will automatically reset the opacity of the Operational Layers to their original level.

Select the XY Information tool, then click on the map. A pop-up window will appear with coordinate information for that location and an orange cross will be displayed at the point where the map was clicked. Use the Clear button in the lower right corner of the XY Information pop-up to clear XY markers from the map.

The Table of Contents tool opens up the map's table of contents, which shows all the layers and base maps that can be displayed in the viewer. Turn Operational Layers and Base Maps on and off by checking or unchecking the corresponding check boxes and radio buttons. Closing the Map Layers window with the Operational Layers turned off will automatically turn the layer(s) back on.

The Measure tool can be used to measure distance and area on the map. Select Length to measure length or Area to measure area on the map.

Overview Map

Click on the Overview Map button (located in the lower right hand corner of the map) to minimize or maximize the overview map.

If you require further assistance using this viewer, please contact...

Aaron Richer
MassDEP - GIS Program
1 Winter Street
Boston, MA 02108
(617) 574-6856

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