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Construction Activity Permit Associated with Stormwater

Stormwater Discharges from Construction Sites

All construction activities must use Best Management Practices (BMPs) to prevent pollutants from entering the Municipal Separate Storm Sewer System (MS4). Even if the work does not require a permit, all pollution sources must be controlled by BMPs and all federal, state, and local regulations must be complied with. A Construction Activity Permit associated with Stormwater is required for activity that disturbs one or more acres. In addition, a Construction Activity Permit associated with Stormwater is required 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 process.

Colorado Department of Public Health and Environment (CDPHE) Permit

A permit from the CDPHE may be required; in this case a Stormwater Management Plan (SWMP) must be completed. Allow at least 10 business days to acquire a permit from the CDPHE. For more information visit or call (303) 692-3500.


City of Longmont Permit

Permit Terms and Conditions

Obtaining a Stormwater Discharge Permit

Maintaining a Stormwater Discharge Permit

De-activating a Stormwater Discharge Permit



Stormwater Quality Program

1100 S. Sherman

Longmont, CO 80501

Phone: (303) 651-8376

or email:



Terms and Conditions of Construction Activity Permit associated with Stormwater (coming soon)

Permit Flowchart* (16 KB pdf)

Permit Terms and Conditions* (76 KB pdf)

Permit Application- New, Renewal, or Modification* (143 KB pdf)
Permit Application- Transfer* (151 KB pdf)

Permit Application- Expiration* (80 KB pdf)

Permit Application- Notice of Termination (NOT)* (91 KB pdf)

Site Plan Review Checklist* (84 KB pdf)

Site Inspection Checklist* (32 KB pdf)

Prohibitions and Exemptions for Discharges
Stormwater Quality Program
Development/Design Standards
Post-Construction BMP PE Certification Form* (69 KB pdf)

*Can't download a PDF file? More information available for Acrobat Reader.

Construction Activity Permit Terms and Conditions

The Terms and Conditions of the Construction Activity Permit associated with Stormwater detail the City of Longmont requirements for discharging stormwater from construction sites. Essentially all pollutions sources must be controlled through the use of approved BMPs, a 24-hr contact must manage and inspect the site, and a site map must be kept up-to-date and on site.

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Obtaining Stormwater Construction Permits - City of Longmont

This section describes the process for obtaining a City of Longmont Construction Activity Permit associated with Stormwater, remember that there may be other federal, state or local permits required and it is your responsibility to obtain all necessary permits. To obtain a Construction Activity Permit associated with Stormwater you need to submit an application, submit a site plan for review and pay fees.

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


The Owner/Operator must complete and submit the application and site plan to the City of Longmont. Additional information may be required for site specific circumstances.

Allow at least 10 business days for permit issuance. The Permit Application and Site Plan Review Checklist are available on-line.


Generally, the site plan must include project boundaries and limits, type and location of all pollution sources and BMPs, site conditions and drainage, and BMP details. Refer to the Site Plan Review Checklist for a detailed list of site plan requirements. Unless otherwise approved by the City, all BMPs must be in compliance with the City’s Development/Design Standards, UDFCD Urban Storm Drainage Criteria Manual Volume 3 (, or CDOT Erosion Control and Stormwater Quality Guide ( If you have any questions, please contact the Project Manager or Development Review Engineer.


Fees must be paid before the permit will be issued and may be paid at any time. The stormwater portion of a new permit is $1,300. For more information on fees, please refer to the Fees section.


Owner/Operator/Applicant and the Construction Supervisor and Foreman will attend a Pre-Construction Meeting with City staff. Stormwater compliance, expectations, and site specific circumstances will be discussed. Remember absolutely no work that disturbs land can begin until the permit has been issued.


EPA has developed an easy-to-read reference explaining the basic principles of developing and maintaining an effective stormwater pollution prevention plan (SWPPP) and can be used at most construction sites in any state, territory or in Indian country. A customizable SWPPP Template, an Inspection Template, two "model or example" SWPPPs, and other stormwater resources are also available. See and the Construction Center at Printed copies of the guide are available from EPA's National Service Center for Environmental Publications, 1-800-490-9198, (document number EPA-833-R-06-004).

If there are jurisdictional wetlands present on site or if you are not sure, contact:

Terry McKee, Regulatory Specialist
U.S. Army Corps of Engineers
(303) 979-4120
FAX (303) 979-0602

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Maintaining the Construction Activity Permit

It is the permittee’s responsibility to comply with all applicable federal, state, and local stormwater and water quality regulations and requirements. This section reviews the requirements for the City of Longmont’s permit requirements and does not necessarily include all applicable regulations or requirements.


All pollution sources on the site must be controlled by BMPs and all BMPs must be appropriate for the pollutions source and installed and maintained in a manner to insure that they function properly for the duration of their use. The City may require BMPs to be installed, modified, maintained, relocated or removed in order to prevent pollutants from discharging to the MS4. In this case the owner or operator shall make the necessary modifications to the BMPs immediately.

All BMP deficiencies must be corrected immediately!!!


The site plan must be kept up-to-date and onsite during active construction. Copies of the current site plan shall be available upon request.


City staff performs oversight inspections to ensure that the site is controlled and incompliance with the Construction Activity Permit. An example of the City's Site Inspection (BMP) Checklist is available on line.

Note that the CDPHE permit requires self-inspections every 14 days and after any significant rainfall or snowmelt.


At least ten days prior to the expiration date, the permittee must submit a Construction Activity Permit Application and site plan. Depending on how long it has been since the last site plan review or site specific circumstances, the site plan may be reviewed during permit renewal. All pending fees and penalties must be paid and applicable renewal fees apply.


At any time any of the information requested on the permit application changes, you need to submit the Construction Activity Permit Application form with the permit number and only the information that has changed. Site plan submittal and review will only take place if there is a modification to the site plan. If the site plan is reviewed then the site plan review fee applies.


As soon as possible but no later than 7 days of becoming aware of change in owner or permittee, you must submit a Notice of Notice of Transfer application application. Please note that change in contact name is not the same as change in permittee or owner; contact name or associated information change would be covered under a permit modification. However, if the permitted company or owner changes then it is a permit transfer. If both parties cannot or will not sign the form, a reassignment can be processed. Applicable fees will charged to the new permittee and will depend on the circumstances. Applicable pending fees or balances will still apply to the original permittee.

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Deactivating or Terminating the Construction Activity Permit

When the project is completed, the permittee must submit the Notice of Termination (NOT) to deactivate the permit. The termination requirements for final stabilization, removal of temporary BMPs, and payment of pending fees and penalties are described below.


The first step to closing your permit is to achieve final stabilization. Final stabilization is achieved when all ground surface disturbing activities have been completed, and uniform vegetative cover has been established with an individual plant density of at least 70 % of pre-disturbance levels, or equivalent permanent, physical erosion reductions methods have been employed. For purposes of permit termination, the City of Longmont determines if final stabilization has been achieved.


After final stabilization has been achieved, all temporary BMPs must be removed before the permit will be terminated. Confirmation of temporary BMP removal is made during the final City inspection.


All pending fees and penalties must be paid in order to terminate your permit. These fees may have come from permit renewal, modification, transfers, re-inspections, site plan review, or enforcement actions. For more information about fees, please refer to the Fees section or call the project manager or development engineer.


Although not part of the Construction Activity Permit associated with Stormwater, many construction sites implement post-construction or permanent BMPs. Remember that the City of Longmont has a post-construction program and part of that requires the Owner/Operator to provide certification signed by a professional engineer verifying that the permanent BMPs have been installed as per approved plans and specifications.

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The Construction Activity Permit has three different associations: Grading, stormwater, and floodplain. This webpage (including this Fees section) only discusses the stormwater association. The stormwater fees include site plan review, inspections, and re-inspections. Each of these is described below. The stormwater cost for a new permit is $1,300. Costs may vary for renewal, modification, or transfer. If you have any questions please contact the project manager or development engineer.


The fee for each site plan review is $300. The site plan is reviewed when the permit is issued. Depending on the situation and progress it may be reviewed at permit renewal, transfer, or modification. If there are major changes to the site plan, the City may require you to submit a modification which would trigger a site plan review.


The City inspectors perform oversight inspections on construction sites. These inspections do not count as inspections for CDPHE or other permits. City inspections are $1000 per permit term (not to exceed 2 yrs). Inspection fees will be processed during permit issuance and renewals. Transferring a permit will also transfer the remaining inspections left before expiration.


If at any time the City Inspector determines that the site is out of compliance, a re-inspection will be scheduled. Each re-inspection costs $100 and must be paid before renewal, transfer, modification, or termination of a permit will be processed.

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Stormwater Program|Water Utilities|Public Works & Natural Resources|City of Longmont

This page was updated August 19, 2013
City of Longmont Public Works & Natural Resources Department
Environmental Services Division
Stormwater Quality Program