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Welcome to the Town of Chilmark, MA
Septic System Separations rev 2012




3.07(3)  Minimum Setback Distances: (15.211)
All systems must conform to the setback distances set forth below, including reserve area, measured in feet.  Where more than one setback applies, all setback requirements shall be satisfied.


Septic tank, holding tank, pump chamber, treatment unit, grease trap
Soil Absorption System
Property Line
10
30
Cellar or Crawl space wall, in-ground Swimming Pool foundation drain
10
20
Slab Foundation
10
10
Public Water Supply Well
Not permitted in Zone 1
Not permitted in Zone 1
Public Water Supply Well in the Coastal District
greater of 600 or Zone I
Onsite Water Supply Well or Suction Line
50
150

Onsite Water Supply Well or Suction Line in Inland Zone of Coastal District
200
200

Water Supply Line (pressure)
10
10
Water Supply Line (pressure) VERTICAL
18”
Irrigation Well
10
25
Leaching Catch Basins & Dry Wells
10
25
Leaching Facility (Inland Zone of Coastal District)
300

Seasonal High Water Table (VERTICAL)
5
Surface Waters (except wetlands)
25
150
Saltwater Body (Coastal District)
100
200
Bordering Vegetated Wetland
50
100
Vernal Pools  
50
150
Coastal Bank or Cliff
Greater of 100 or 20x avg. annual erosion
Tiasquam River or Edge of Associated Wetland
50
200
Squibnocket Pond
50
500
Squibnocket Pond Associated Wetland, Stream, or Pond
50
200


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Chilmark Town Offices: Chilmark Town Offices: 401 Middle Road, P.O. Box 119 02535-0119
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