Stormwater Construction Activity Permits

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A program of Public Works & Natural Resources

Construction Activity
Construction Activity
Construction Activity

All construction sites must employ Stormwater Pollution Controls (SPCs) and Best Management Practices (BMPs) to prevent pollutants from entering the City of Longmont’s Municipal Separate Storm Sewer (MS4).  Even if the work does not require a City of Longmont Stormwater Construction Activity Permit (SCAP), all pollution sources must be controlled with BMPs and the site must be in compliance with all federal, state and local regulations.
A Stormwater Construction Activity Permit (SCAP) from the City of Longmont is required for activities that disturb one or more acres or if the City determines that the construction activity could have a detrimental effect on public health or the environment. Residential individual lot construction that is less than one acre is covered under the Building Permit. Click here to review a flowchart to find out what kind of permit is required. Information pertaining to the SCAP is available in the links below. 


No work that disturbs land can begin until the SCAP has been issued!


Stormwater Quality Information for Construction Activities

Construction Stormwater Fact Sheet

Stormwater Plan Review Flow Chart
Stormwater Pollution Control Construction Drawing Review Checklist
City of Longmont Stormwater Pollution Control Construction Drawing General Notes
City of Longmont Stormwater Pollution Control Construction Drawing Signature Block 

Stormwater Construction Activity Permit Application
Stormwater Construction Activity Permit EXAMPLE

Fact Sheet: Stormwater Construction Activity Permit Fee Information
Fact Sheet: Maintaining Your Stormwater Construction Activity Permit 

Stormwater Construction Activity Permit Renewal or Modification Application
Stormwater Construction Activity Permit Transfer Application 
Stormwater Construction Activity Permit Notice of Termination

Permanent Stormwater Control Permit 

Permittees Must Report Spills, Discharges and Violations

Please note that Section A. 6. of the SCAP requires the Permittee to notify the City as soon as practicable, but no later than 24 hours after becoming aware of any spill, discharge or non-compliance with this permit.

Spills during regular business hours are reported to the Public Works Call Center at (303)-651-8376 and the assigned City Project Manager.  After hour and weekend spills must be reported to the Public Works on-call technician at (303) 651-8468.



Inlet Marker


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