In response to the requirements of the Federal Water Quality Act of 1987, San Antonio City Ordinance No. 98635 established monthly stormwater fees and rate schedules to protect the health, safety, and welfare of the community.

The stormwater fee is billed by SAWS on behalf of the City of San Antonio’s stormwater utility to support and manage the operation and maintenance of the stormwater infrastructure, as well as for engineering, design, and capital improvements.

San Antonio’s stormwater utility works to solve drainage problems and improve surface water quality, to prevent future problems, and to repair, maintain, and enhance the storm water infrastructure.

On Sept. 10, 2015, the San Antonio City Council approved revisions to the Stormwater Fee structure using an impervious cover approach.  The 2018 fees shown below reflect the new approach were effective Oct. 1, 2017, and the 2019 fees shown below became effective on Oct. 1, 2018.

For more information on how the City of San Antonio determines impervious cover or the stormwater fee, click here.


Residential properties shall be assigned a rate category and assessed a Drainage Utility Charge based on impervious area as provided:

  Residential Stormwater Fee Schedule
Customer Class/Tier Impervious Area
(Sq. Ft.)
Tier 1 ≤ 2,750 $3.67
Tier 2 > 2,750 – 4,220 4.83
Tier 3 > 4,220 10.22



Non-residential properties shall be assigned a rate category and assessed a Drainage Utility Charge determined by a base fee and impervious fee in accordance with the values provided below:

Base Fee: A flat, per monthly fee assessed among all non-residential benefited properties.

Base Fee Schedule
Base Fee $65.82


Impervious Fee: A monthly fee assessed on all non-residential benefited properties on a per square foot basis and prorated based on the percentage of impervious area within the benefitted property.

  Non-Residential Stormwater Fee Schedule
Percent Impervious
per 1,000 Sq. Ft.
Tier 1 ≤ 20% $0.30
Tier 2 > 20 – 40% 0.44
Tier 3 > 40 – 65% 0.57
Tier 4 > 65% 0.72


Rev. 10/2018