As part of Boulder County’s water quality protection and municipal separate storm sewer system (MS4) construction program, a stormwater quality permit (SWQP) is required for construction projects that:
- Disturb one acre or more in size;
- Are less than one acre and construction activity is part of a larger common plan of development that will ultimately disturb one acre or more, even if multiple, separate, and distinct land development activities may take place at different times; or,
- Are within 100 horizontal feet of a watercourse.
The County Engineer may require a SWQP regardless of the size of the total disturbed area, in conjunction with approval of a final subdivision plat, special use permit, or other site specific development plan under the Land Use Code, or if construction is adjacent to a watercourse or wetlands. Boulder County is required by the Environmental Protection Agency (EPA) and the Colorado Department of Public Health and Environment (CDPHE) to maintain a Stormwater Management Program.
Detailed requirements are listed in Article 7-904 of the Boulder County Land Use Code
Stormwater Management is Important
Polluted stormwater runoff from construction sites often flows to storm drain systems and is ultimately discharged into local streams and rivers, destroying aquatic habitat. Sediment is usually the main pollutant of concern, but there are others:
- Solid and sanitary wastes
- Phosphorus and nitrogen from fertilizers
- Concrete from washouts
- Construction chemicals, debris, and trash
- Oil and grease
Sedimentation runoff from construction sites is typically 10 to 20 times greater than those from agricultural lands, and 1,000 to 2,000 times greater than those from forested lands.
Important Permit Information & Requirements
- Download the Stormwater Quality Permit Requirements
- Download the Grading Permit and Stormwater Quality Permit Application Form
- Download the SWQP Project Checklist
- Download the SWQP Small Project Checklist
- Download the SWMP Template
- Download the CDOT SWMP Template Supplement
- Download Guidance for Small Construction Projects
- Download Guidance for Construction Near Waterways