Boston requires grading and drainage plans for construction projects to ensure proper stormwater management and prevent damage to adjacent properties. The BWSC reviews drainage connections and the Inspectional Services Department approves grading plans. Projects must maintain positive drainage away from foundations and not redirect runoff onto neighboring properties.
Grading and drainage in Boston are regulated by BWSC for stormwater connections and ISD for site grading. Any project connecting to the city's drainage system requires a BWSC site plan review and permit. Grading must direct surface water away from building foundations and toward approved drainage facilities. Massachusetts building code requires a minimum 6-inch drop in grade within the first 10 feet from a foundation. Projects cannot alter drainage patterns to increase runoff onto adjacent properties. For larger developments, the BPDA review process includes drainage impact analysis. Fill operations require ISD permits and must not obstruct natural drainage courses. In areas with combined sewer systems, BWSC may require separation of stormwater and sanitary connections. Green infrastructure installations that manage drainage on-site are encouraged through the stormwater fee credit program.
Altering drainage to damage adjacent properties can result in civil liability and ISD enforcement. Unpermitted connections to the city drainage system carry BWSC fines. Grading work without required permits results in stop-work orders. Fill operations without permits carry ISD penalties.
Boston, MA
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