Stormwater Management: Lowell vs Waltham
How do stormwater management rules compare between Lowell, MA and Waltham, MA?
Lowell and Waltham have similar restriction levels.
Lowell, MA
Middlesex County
Lowell enforces a local Stormwater Management Ordinance under its MS4 permit, requiring erosion controls and on-site management for projects over 1 acre or 5,000 square feet of disturbance.
View full Lowell 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 | Lowell | Waltham |
|---|---|---|
| Permit authority | EPA MS4 NPDES | - |
| Permit threshold | 5,000 sq ft disturbance | - |
| TSS removal | 80 percent | - |
| 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.
Lowell FAQ
Do I need a stormwater permit for a new driveway?
Only if the combined disturbance exceeds 5,000 square feet. Smaller projects still must avoid directing runoff onto neighbors or streets.
Can I wash my car in the driveway?
Occasional residential car washing is allowed, but commercial washing that discharges to the storm drain is considered an illicit discharge.
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.
Compare other topics
See how Lowell and Waltham compare on other ordinance categories.
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