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1. Where can I find information regarding drainage requirements on residential construction?

Section 8 of the Temporary Erosion and Sediment Control Manual (TESC) (PDF) provides information on residential drainage regulations for all residential lot construction. Refer to Section 8.4 for minimum drainage requirements for finished grade.

2. Can I store landscape materials in the street for my house project?

Temporary storage of landscape and construction material is not permitted in the street, nor on the sidewalk. Landscaping materials left in the street will be washed away with the next rain or snowstorm, clogging drains, impairing waterways and impeding emergency access routes. Store materials on private property away from the path of drainage.

3. When am I required to install landscaping at my new house?

The Town requires landscaping to be installed within six months after occupancy. This includes both front and back yard landscaping.

4. Where do I submit a mosquito annoyance complaint or information request?

The Town contracts with Vector Disease Control for mosquito control. To submit a mosquito annoyance complaint or request information on the Town's mosquito control program, please contact Vector at 877-276-4306 or email Vector Disease Control.

Vector Disease Control International

5. What can I do about the excessive water and ice that constantly flows over my sidewalk?

Refer to our Excessive Water brochure (PDF) for troubleshooting facts and suggestions to address excessive water, ice and algae growth concerns. To inquire about our chase drain program, please call the Stormwater Hotline, 720-733-2235.

6. Can the storm drain inlet on my street be altered?

Storm drain inlets are intended to capture street drainage and maintain safe travel on streets during flooding events. The size and shape of the storm drain inlets are required to ensure that flooding does not occur. Restrictions to these openings are not permitted, as they have the potential to cause clogging or reduced capacity resulting in adverse flooding impacts to property and emergency access routes. Take appropriate precautions near these facilities. For your safety, never open, climb in or attempt to retrieve items from a storm drain inlet. To report accidental or illegal dumping down the storm drain, please call the Stormwater Hotline, 720-733-2235.

7. Who may I contact to address soil erosion in the open space near my property?

Generally, maintenance responsibility of open space lies with the property owner. If you have more questions or would like to request maintenance of Town-owned open space, please contact 720-733-2235. Please note that open spaces in the Town are naturally steep and erosive. It is expected that some degree of erosion and drainage will result from these natural spaces. You may refer to Section 6 of the TESC Manual (PDF) for guidelines on acceptable natural vegetative cover on construction project.

Douglas County parcel locator

8. Who may I contact to request maintenance of the drainage facilities on or near my property?

Generally, the property owner is responsible for maintenance of drainage facilities on their parcel. If you have additional questions or would like to request maintenance of Town-owned facilities, please call the Stormwater Hotline at 720-733-2235. If you do not know who owns the open space in question, visit the Douglas County parcel locator.

Douglas County parcel locator

9. How may I request a review of the monthly stormwater utility fee for my commercial property?

Customers are entitled to appeal for an adjustment of the Stormwater Utility fee for non single-family properties. Stormwater utility fees for commercial property are calculated based on the number of single-family-equivalents as follows: Parcel size in square feet times 80% impervious divided by 3,255 impervious square feet. To request a review, complete the Request for Administrative Review Form, and submit to Castle Rock Water. We will respond to your request within 45 days.

Request for Administrative Review Form

10. Who should I call if I am aware of accidental or illegal dumping down the storm drain?

Recognize potential illegal discharges! Only stormwater is allowed down the drain. When considering what may go down the "gutter," remember it is anything you would be comfortable drinking or swimming in. Report accidental and illegal dumping into the storm drainage system to the Stormwater Hotline, 720-733-2235. Call 911 immediately if you suspect hazardous or life-threatening substances. For a list of allowable discharges, refer to the Town Municipal Code Chapter 4.03.080.

Municipal Code 4.03.080

11. Where does the water that leaves my street go?

Stormwater runoff is collected by a network of gutters, catch basins, pipes, temporary holding ponds and channels that lead directly to the nearest waterway. This network is known as the Municipal Separate Storm Sewer System, or MS4. Only stormwater is allowed in the MS4. Remember: one thing is clear, our rivers, lakes and creeks depend on you!

One Thing is Clear

12. What is a drainage swale?

A drainage swale is an engineered drainage feature, which the builder creates for the purpose of protecting the structure. View an illustration of a swale (PDF) and Section 8 of our TESC Manual (PDF) for additional information.

13. My lender is requiring flood insurance. What do I do?

Visit our Flood Insurance page for information on this topic.

Flood Insurance