Erosion Control: Boston vs Chelsea
How do erosion control rules compare between Boston, MA and Chelsea, MA?
Chelsea has fewer restrictions than Boston.
Boston, MA
Suffolk County
All construction projects in Boston must implement erosion and sediment controls per BWSC requirements and the EPA Construction General Permit. Projects disturbing 1 or more acres require a Stormwater Pollution Prevention Plan (SWPPP). The Boston Conservation Commission may impose additional controls near wetlands and waterways.
View full Boston rules →Chelsea, MA
Suffolk County
All Suffolk County municipalities require erosion and sediment controls during construction per the MA State Building Code (780 CMR) and the 2020 MassDEP Stormwater Handbook. Boston requires a Soil Erosion and Sedimentation Control Plan for projects disturbing 20,000+ sq ft. Chelsea, Revere, and Winthrop use the MassDEP BMPs: silt fence, hay bales, stabilized construction entrance, and inlet protection.
View full Chelsea rules →Key Facts Comparison
| Fact | Boston | Chelsea |
|---|---|---|
| SWPPP Required | 1+ acre disturbance | - |
| Inspection Frequency | Weekly and after 0.5" rain | - |
| Wetland Buffer | 100 ft wetlands, 200 ft rivers | - |
| Dewatering | BWSC approval required | - |
| Oversight | BWSC, Conservation Commission, EPA | - |
| State Code | - | 780 CMR Appendix J |
| Federal | - | EPA CGP for 1+ acre |
| Boston Threshold | - | 20,000 sq ft |
| Stabilization | - | 14 days inactive, 7 near wetlands |
| Wetlands | - | 100 ft buffer jurisdiction |
Highlighted rows indicate differences between cities.
Boston FAQ
When is a SWPPP required in Boston?
A Stormwater Pollution Prevention Plan is required for any construction project disturbing 1 acre or more, per the EPA Construction General Permit. Smaller projects may still need erosion controls per BWSC requirements.
What erosion controls are required near Boston wetlands?
Work within 100 feet of wetlands or 200 feet of rivers requires Boston Conservation Commission approval under the Wetlands Protection Act. Enhanced erosion controls including double silt fencing and sediment traps are typically required.
Chelsea FAQ
Do I need erosion controls for a single-family home?
Usually yes if clearing 5,000+ sq ft. Minimum BMPs — silt fence downgrade, stabilized entrance — apply even below thresholds if the site is near a catch basin or wetland.
Who inspects erosion controls?
In Boston, BWSC and ISD. In Chelsea, Revere, Winthrop: Building Department, Conservation Commission, or DPW depending on site.
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