As sites in Watertown are developed or redeveloped, the land is disturbed by construction activities such as tree clearing and excavation of surface materials and soils that leaves the ground exposed.  Demolition debris, fuels, chemicals and construction materials are often stored on site.  On a windy or rainy day, exposed soils are susceptible to being blown or washed away.  Materials without proper protections can also be washed away.  Stormwater runoff from construction sites can collect pollutants like sediment, oil, and grease and carry them to into the Town’s storm drains and the Charles River, without and treatment.

After construction ends, the paved areas, roofs, and other impervious surfaces will continue to generate stormwater pollution and contribute to flooding problems if there are insufficient long-term stormwater controls on a site.

DPW administers the Town’s Stormwater Management and Erosion Control Ordinance, Chapter 98 of the Code of Ordinances to regulate stormwater management and erosion control during and after construction. Projects of certain size and scope are required to obtain a permit from DPW to demonstrate compliance with the permit. In general, the following types of projects require coverage under a permit:

•    New single family residential construction

•    New two-family residential construction or residential addition with new unit

•    New commercial or multi-unit residential construction

•    Net increase in site impervious surface area by more than 500 square feet

•    Land disturbance of 5,000 square feet of total area or more (includes driveway and parking lot excavation, reclamation, milling)

•    Land disturbance of 1 acre or greater (If YES, project additionally requires USEPA Construction General Permit)

•    Preliminary site investigation activities that will be part of a larger common development plan that will disturb 5,000 square feet of total area or more

•    Create or modify a direct connection to the MS4 (Town of Watertown stormwater system)

Documents

• Stormwater Management and Erosion Control Ordinance
• Stormwater Management and Erosion Control Rules and Regulations
• September 28, 2015 Presentation to Town Council Committee on Public Works
• For contractors:  Construction Site Impacts and Erosion and Sediment Control Requirements
• Single and Two Family Checklist
• Multi-family Residential and Commercial Checklist
• As-built Requirements

Application

• Stormwater Management and Erosion Control Permit Application

Links

• Massachusetts Erosion and Sediment Control Guidelines for Urban and Suburban Areas 
• Massachusetts Stormwater Handbook and Stormwater Standards