Castle Rock, CO Landscaping Rules: Water Restrictions (2026)

Castle Rock Water assigns every customer a square, circle, or diamond symbol, identified by the last number of the street address, which sets prescribed watering days. During the restriction period of May 1 through Sept. 30, residential watering is permitted every third day, and only before 8 a.m. or after 8 p.m. Water may not pool in gutters, streets, and alleys, and residents must repair leaking or misaligned sprinklers and not irrigate during rain or high wind. Hand-held hose watering is allowed any time if no waste occurs. New plantings may qualify for a temporary exemption.