[2024 AR] MS4 Permittees

2024 Report

Regulated Stormwater MS4 Permittees

All municipalities with Municipal Separate Storm Sewer Systems (MS4s) permits from the Colorado Department of Public Health and Environment (CDPHE) in the watershed have adopted stormwater programs consistent with Regulation 72 for development and redevelopment projects within their jurisdictions. Both construction-phase and permanent stormwater control measures are required. Regulation 72 requirements are more stringent than MS4 Permit requirements in Regulation 61 Colorado Discharge Permit System Regulations.

In 2024, the MS4 permittees conducted over 11,300 inspections of over 2080 construction sites. In addition, the MS4 permittees required that construction site owners/operators install 49 new permanent control measures that are designed to reduce or eliminate pollutants in stormwater before it enters Cherry Creek or its tributaries.

Further information on each MS4’s program can be found in the links below.

Find out more about MS4 Permittees' programs​

Public Education

In addition to regulating development and redevelopment sites in the Cherry Creek Reservoir basin, MS4 permittees also have programs for public education and outreach, to respond to and eliminate illicit discharges, to and reduce or eliminate pollutants in stormwater from municipal operations. Examples of these efforts include:

 

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Grass Swale

Above & Beyond

Splash & DC Clear Outreach and Education

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Summary of 2024 Education and Outreach Activities

The Douglas County Cooperative for Local Environmental Awareness and Responsibility-CLEAR brings together 14 regional stakeholders including Douglas County, Town of Castle Rock, Town of Parker, City of Castle Pines, and Lone Tree. CLEAR revamped 12 monthly public education ads which run full-page, and in color in Colorado Community Media Newspapers covering portions of Douglas, Arapahoe, and Elbert Counties. The ads run in the Castle Pines News‐Press, Castle Rock News‐Press, Douglas County News‐Press, Highlands Ranch Herald, Lone Tree Voice, Elbert County News, Parker Chronicle, Centennial Citizen, Englewood Herald, Littleton Independent and South Platte Independent, and reached nearly 80,000 households in 2024.

CLEAR also launched a social media campaign on LinkedIn https://www.linkedin.com/company/dc-clear/ and Facebook which focuses on providing awareness around stormwater pollution prevention practices.

CLEAR partnered with the Douglas County Health Department in 2024 to create targeted outreach documents for restaurant and food truck operators. The outreach focuses on best practices for food service operators in order to prevent stormwater pollution.

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Colorado Department of Transportation, CSC and Keep it Clean Spreading the Word on Bustang

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CDOT, in partnership with CSC and Keep it Clean, posted water quality messages on its Bustang buses. These messages focused on fertilizer, pesticide, and pet waste impacts to water quality including nutrients. The outreach campaign started on July 15, 2024 and ran through September 15, 2024. The posters went on all three Bustang routes including the south line which intersects with the Cherry Creek Basin.

2024 Stormwater Permits and Inspections for Construction and Post-Construction Development

 
 
1. 24 tier 1, 1 tier 2
2. All sites brought into voluntary compliance
3. All information provided is for Castle Rock as a whole. We do not track by watershed.
4. Written notices of violation including 1 stop work order
5. Reinspection fees issued
6. SCMs with final acceptanace after 2007
7. Based on retofits to Regional Ponds
8. 0 retrofitted, 111 facilities inspected, 32 facilities maintained
9. 0 retrofitted, 392 inspected and maintained
10.This includes the 5 EDBs in initial acceptance from total number of new permanent BMPs since they are officially installed
11. This number includes EDBs that went into initial acceptance this year, which means their construction was inspected and finalized
12. The city inspects all PSCMs regardless of when they were installed