Did you sign a lease? Also not a lawyer but I agree that what you do or don't have in writing will probably control the outcome. Did a quick google search for "tenant's rights" + Colorado and found this, which doesn't sound great but there may be a ray of light:

Landlords in all states except Alabama, Arkansas and Colorado are responsible for the physical condition of rental property, both when you move in and during your tenancy. This responsibility stems from the landlord's duty to offer and maintain housing that satisfies basic habitability requirements, such as adequate weatherproofing, available heat, water and electricity, and clean, sanitary and structurally safe premises. Even in the three states that have not adopted this habitability rule, local or state housing laws may impose substantially the same requirements on landlords.
from http://www.lectlaw.com/files/lat09.htm, under #10.

If you've got MS Word or other editor that'll handle .doc's, might wanna dig here too:
http://www.dola.state.co.us/cdh/land...nantrights.doc

Good luck