Grading & Drainage: Lowell vs Somerville
How do grading & drainage rules compare between Lowell, MA and Somerville, MA?
Lowell and Somerville have similar restriction levels.
Lowell, MA
Middlesex County
Lowell grading work must comply with 780 CMR, direct runoff away from neighbors and the public right-of-way, and obtain a stormwater permit for disturbances over 5,000 square feet.
View full Lowell rules →Somerville, MA
Middlesex County
Grading over 50 cubic yards or that changes drainage patterns requires DPW review in Somerville. Roof and yard drainage may not discharge to neighbors.
View full Somerville rules →Key Facts Comparison
| Fact | Lowell | Somerville |
|---|---|---|
| Code reference | 780 CMR Appendix J | - |
| Foundation slope | 6 inches in 10 feet | - |
| Stormwater trigger | 5,000 sq ft | - |
| Wetlands buffer | 100 feet | - |
| Permit trigger | - | 50 cubic yards or drainage change |
| Roof leaders | - | To storm or infiltration |
| Neighbor discharge | - | Prohibited |
| Retaining wall permit | - | Over 4 feet |
| Sump to sewer | - | Federal CWA violation |
Highlighted rows indicate differences between cities.
Lowell FAQ
Can I raise my yard grade with fill?
Yes in most areas, but not if it diverts water onto neighbors or sits within a wetland buffer or floodplain without permits.
Do I need a permit to level my backyard?
Small leveling under 5,000 square feet generally does not need a permit, but you still must control sediment and runoff.
Somerville FAQ
Can I regrade my yard to drain away from my foundation?
Yes, as long as the new flow stays on your property or goes to the street or storm drain. You cannot redirect water onto a neighbor's lot without permission.
Do I need a permit to build a small retaining wall?
Walls up to 4 feet typically need only zoning clearance. Walls over 4 feet (measured from bottom of footing) need a building permit and engineered plans.
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