Stormwater & Floodplain Information

Water on road and vehicle splashing through

Welcome to the City of Las Cruces Stormwater and Floodzone Information page. It is important to plan ahead for possible storms and flooding. Here you can find helpful information and resources about stormwater in Las Cruces and information on the Special Flood Hazard Area (SFHA). The SFHA is an area where the National Flood Insurance Program's (NFIP's) floodplain management regulations must be enforced and they are where the mandatory purchase of flood insurance applies.

In this section, you can also get more information on:

  • Community Rating System (CRS)
  • Federal Emergency Management Agency (FEMA)
  • Flood Maps
  • Letters of Maps Change (LOMC)
  • National Flood Insurance Program (NFIP)
  • Obtaining Elevation Certificates

For flooding and stormwater pollution violations in your neighborhood, you can submit a report to 311/Ask Las Cruces.


The National Pollutant Discharge Elimination System

As authorized by the Clean Water Act, the National Pollutant Discharge Elimination System (NPDESpermit program controls water pollution by regulating point sources that discharge pollutants into waters of the United States. Point sources are discrete conveyances such as pipes or man-made ditches. Individual homes that are connected to a municipal system, use a septic system, or do not have a surface discharge do not need an NPDES permit; however, industrial, municipal, and other facilities must obtain permits if their discharges go directly to surface waters.


Polluted stormwater runoff is commonly transported through Municipal Separate Storm Sewer Systems (MS4s), from which it is often discharged untreated into local waterbodies. To prevent harmful pollutants from being washed or dumped into an MS4, operators must obtain permits if their discharges go directly to surface waters.

Flood Zone Information

Community Rating System

Participating communities start off as a Class 10 Community in the NFIP’s Community Rating System (CRS) program and try (through regulating development, drainage maintenance, stormwater management, and various outreach projects) to work their way up to a Class 1 Community. Every time a community moves up a class, the residents with NFIP flood insurance policies get a 5% reduction in their premiums. 

As of October 1, 2020, the City of Las Cruces is a Class 7 Community which gives a 15% discount for those with a High Risk Policy and a 5% for those with a Moderate Risk Policy. 

The reduction should be automatic, but you may want to contact your insurance agent to make sure your policy has been adjusted to reflect the NFIP/CRS discount. Based on the Class 6 Rating, this past year City of Las Cruces NFIP policy holders saved a combined $180,000. The City of Las Cruces honors the State of New Mexico with the best CRS rating in New Mexico. Nationwide only 67 communities out of 1,148 have a lower (or better) rating than the City of Las Cruces.

CRS Ratings and Corresponding Discounts

1 45%
2 40%
3 35%
4 30%
5 25%
6 20%
7 15%
8 10%
9 5%
10 0

Floodplain Outreach Webinar

The City hosted to conduct an educational outreach to residents who are interested in learning more about how floodplains affect Las Cruces and a general overview of the Community Rating System. Please click the link below to view the webinar.

Flood Insurance Outreach for Las Cruces - YouTube


MS4 Report 2022-2023 
View other Annual Reports released by the Stormwater office.

Helpful Links

Provided below are a collection of helpful links and forms to provide you with important information about Stormwater and Flood Zones.

Definition of 3rd Party

This page has links to many other sites (“third-party sites”). A link to a third-party site does not imply that City of Las Cruces endorses or is associated with the third party site, or that the third party site endorses or is associated with the City. These links are provided for informational purposes only. City of Las Cruces does not control and is not responsible for the content, accuracy or completeness of third-party site.

Elevation Certificate Repository

Find helpful information regarding Elevation Certificate Repository.

Illegal Dumping

Federal, county and city entities within Dona Ana County have joined forces to launch a comprehensive campaign to involve concerned community members to help stop illegal dumping. 


The goal of our combined efforts will: 

  • Improve the health of the environment for wildlife and future generations to enjoy
  • Improve the local economy for the benefit of all Dona Ana County residents
  • Improve public health and safety
  • Increase the beauty of the landscape

NoTHro App

NoThro App allows you to report illegal dumping using your cell phone's camera to capture photos of illegal dump sites. The application sends a geo tag or GPS location with the image and generates a report. The NoThro app is free and available for iPhone, iPad, iPod Touch and Android phones. It can be found on Apple's App Store or on the Google Play store.

Additional Information

You may also call City Codes Enforcement at 575-528-4100 to report illegal dumping.