Drainage and Flood Information


  • Physical Address
  • Municipal Plaza Building
    114 W. Commerce, 6th Floor
    San Antonio, TX 78205   
  • Mailing Address
  • P.O. Box 839966
    San Antonio, TX 78283-3966
  • Phone
  • 210.207.8022


  • Razi Hosseini, P.E.
    Director/City Engineer
  • Anthony Chukwudolue, P.E.
    Deputy Director
  • Christie Chapman
    Assistant Director
  • Nefi Garza, P.E.
    Assistant Director
  • Luis Maltos, P.E.
    Assistant Director
  • Paul Berry
    Chief Communications Officer

The Public Works Department is responsible for maintaining our City’s storm water infrastructure and engineering improvement projects to help reduce flooding during rain events. We also review residential and commercial storm water development plans to ensure future construction projects and private development do not adversely impact current drainage systems. Lastly, we are also responsible for overseeing the federal and state Municipal Separate Storm Sewer System (MS4) permit.

Budget and Storm Water Programs
Storm Water Utility Fee

San Antonio River Authority (SARA)
Digital Data and Modeling Repository

Flood Maps
Digital Flood Insurance Rate Maps (DFIRM) approved by the Federal Emergency Management Agency (FEMA)

311 City Services & Info
To submit a storm water related service request, please call 311 (210.207.6000) or make a report online.

National Flood Insurance Program (NFIP)
Federally regulated insurance program which allows the City to enforce floodplain management standards and allows property owners and renters to purchase flood insurance

Elevation Certificate button

Elevation Certificate
For more information on how to obtain an Elevation Certificate for your property address, please call 210.206.8433.

UDC Definitions

Unified Development Code (UDC) Definitions
Appendix A of the UDC lists definitions and rules of interpretation

Bexar Regional Watershed Management (BRWM)

For information on the Bexar Regional Watershed Management (BRWM) partnership between the Bexar County Commissioners Court, The City of San Antonio and the San Antonio River Authority (SARA), visit the BRWM website

Bexar County Flood Information

Bexar County provides current flood information and emergency road closures that can be found here


US Geological Survey (USGS)
The USGS provides stream gage data at the USGS website. To search gage information on the website, click a colored dot on the map and click the grey “More Data” button. There, the Gage Height (height of water above a reference point), Discharge (volume of water flowing past a given point in the stream), and precipitation values can be viewed.

San Antonio Flood Emergency SAFE System

San Antonio Flood Emergency (SAFE)
For more information on flood facts, flood insurance, flood preparedness and flood resources, visit the SA Flood Safe website.

San Antonio Fire Department

What To Do If Caught In A Flash Flood
Whether walking or driving, find some steps you should take if you are caught in a flash flood. Visit the San Antonio Fire Department website.

GIS Maps

The following GIS maps are also available.

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