FAQs – Flood

A permit is required before any construction or development can begin within any special flood hazard area (SFHA). The city requires a Floodplain Development Permit for all proposed construction or other development in the city including the placement of manufactured homes proposed within flood-prone areas. Permits are required to ensure that proposed development projects meet the requirements of the NFIP and the City of Longmont floodplain regulations. Visit the Floodplain Development Permit webpage for more details.

Flood insurance is available for any property, regardless of whether it is located within a floodplain. Learn more on the Flood Information – Flood Insurance webpage.

Find out whether your property is at risk for flooding by entering your address in Longmont’s Floodplain Inquiry Map, available through the Flood Information – Are You in a Floodplain? webpage.

Collaborative efforts are under way by both Boulder County and the City of Longmont to make the St. Vrain Creek capable of safely carrying up to 100-year flood flows. Learn more about Longmont’s efforts on our Resilient St. Vrain webpages and find Boulder County’s information on the St. Vrain Creek Master Plan.

Visit the Flood Preparedness and Safety webpage to learn what actions Longmont’s Office of Emergency Management takes and how to stay connected in case of flooding in our community. And review ways to improve your property’s resilience to flooding on the Protect Your Property from Flooding webpage.

Visit our Flood Information – Status and Monitoring webpage.

Be sure you sign up for the Longmont Reverse Emergency Notification System to receive real-time, emergency notification on devices beyond a traditional landline telephone. The system is used to notify our community if evacuation is needed. You will only receive notifications during an emergency. You can register cell phones, VoIP accounts and email accounts. The system is “geo-based,” which allows you to link your devices to your home address. If an evacuation is needed and your home address is included, you will be notified regardless of where you are (at work in Denver, out shopping, etc.).