Boston, MA Environmental Rules: Stormwater Management (2026)
Key Facts
- Trigger
- Land disturbance over 1 acre
- Administered By
- Boston Water & Sewer Commission
- Standards
- MassDEP 10 Stormwater Standards
- Fee Basis
- Impervious area stormwater utility fee
- LID Incentive
- Fee reductions for green infrastructure
Summary
Boston requires stormwater management plans for any land disturbance over 1 acre under the city's Stormwater Management Ordinance and the EPA MS4 permit. The Boston Water and Sewer Commission (BWSC) administers stormwater utilities and requires on-site retention for new development. Projects must comply with MassDEP Stormwater Management Standards.
When a notice of intent proposes activities on land under water bodies and waterways or on a tract of land greater than 50 acres, written notification shall be given to all abutters within 100 feet of the proposed project site. For the purposes of this section, ''project site'' shall mean lands where the following activities are proposed to take place: dredging, excavating, filling, grading, the erection, reconstruction or expansion of a building or structure, the driving of pilings, the construction or improvement of roads or other ways and the installation of drainage, sewerage and water systems, and ''land under water bodies and waterways'' shall mean the bottom of, or land under, the surface of the ocean or an estuary, creek, river stream, pond or lake.
Full Breakdown
Boston's stormwater program is administered by the BWSC under the city's MS4 permit and local drainage regulations. All new development and redevelopment projects disturbing more than 1 acre must submit a Stormwater Management Plan demonstrating compliance with MassDEP's 10 Stormwater Management Standards. Boston requires post-development peak runoff rates not to exceed pre-development rates for the 2-year and 10-year storms. The BWSC charges a stormwater utility fee based on impervious area. Low Impact Development (LID) techniques such as rain gardens, permeable pavement, and green roofs are encouraged and can reduce fees. The city's Climate Ready Boston initiative has increased stormwater infiltration requirements in flood-vulnerable areas. Construction sites must implement erosion and sediment controls per the EPA Construction General Permit.
Violations & Fines
Failure to implement required stormwater controls can result in BWSC enforcement actions, stop-work orders from the Inspectional Services Department, and fines up to $25,000 per day under the federal Clean Water Act for MS4 permit violations. Illicit discharges to the storm drain system carry penalties under Boston Municipal Code.
Frequently Asked Questions
Who manages stormwater in Boston?
Do I pay a stormwater fee in Boston?
Sources & Official References
Other rules in Boston
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Stormwater Management in Nearby Cities
How other cities in this county handle stormwater management.