Stormwater Management: Cambridge vs Waltham
How do stormwater management rules compare between Cambridge, MA and Waltham, MA?
Cambridge and Waltham have similar restriction levels.
Cambridge, MA
Middlesex County
Cambridge requires stormwater management plans for construction disturbing one acre or more and implements strict post-construction standards to reduce flooding and protect the Charles River and Alewife watershed.
View full Cambridge rules →Waltham, MA
Middlesex County
Waltham operates under an EPA MS4 permit and requires stormwater management plans for developments disturbing over 1 acre or adding significant impervious surface.
View full Waltham rules →Key Facts Comparison
| Fact | Cambridge | Waltham |
|---|---|---|
| Trigger | 1 acre disturbance | - |
| Standard | First inch treatment | - |
| Program | EPA MS4 Phase II | - |
| LID | Encouraged or required | - |
| Illicit discharge | Prohibited | - |
| MS4 Permit | - | EPA Phase II community |
| Permit Trigger | - | 1 acre or 5,000 sq ft impervious |
| Receiving Water | - | Charles River TMDL |
| Illicit Discharges | - | Prohibited |
| Fines | - | Up to $5,000 per day |
Highlighted rows indicate differences between cities.
Cambridge FAQ
When do I need a stormwater plan?
Projects disturbing one acre or more trigger the full stormwater plan; smaller projects in sensitive areas may also need review.
Can I discharge anything to the storm drain?
No, only clean stormwater; wash water, chemicals, and pool water are illicit discharges subject to fines.
Waltham FAQ
When do I need a stormwater permit in Waltham?
For any project disturbing 1 acre or more, or redevelopment adding more than 5,000 square feet of impervious surface. Smaller projects may still need Conservation Commission review.
Can I wash my car in my Waltham driveway?
Yes for personal use, but commercial car washing that discharges to storm drains is prohibited. Charitable car washes should use grass areas or dedicated wash bays.
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