Grading & Drainage: Somerville vs Waltham
How do grading & drainage rules compare between Somerville, MA and Waltham, MA?
Somerville and Waltham have similar restriction levels.
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 →Waltham, MA
Middlesex County
Waltham requires building permits for grading that alters drainage patterns and prohibits creating runoff that damages abutting properties under common law and local rules.
View full Waltham rules →Key Facts Comparison
| Fact | Somerville | Waltham |
|---|---|---|
| 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 | - |
| Permit Trigger | - | 25 cubic yards or drainage change |
| Slope from House | - | 2 percent minimum 10 feet |
| Retaining Wall | - | Engineer over 4 feet |
| Doctrine | - | Reasonable use surface water |
| Wetlands | - | Con Com review required |
Highlighted rows indicate differences between cities.
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.
Waltham FAQ
Can my Waltham neighbor grade water onto my property?
No. Massachusetts reasonable use doctrine prohibits unreasonable alteration of drainage that damages neighbors. You may have civil remedies or can file a complaint.
Do I need a permit for landscaping regrading?
Minor landscape grading under 25 cubic yards typically does not require a permit, but any change to drainage patterns or near wetlands triggers review.
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