SAWS Conservation: Non-Potable Water Tank Registration
Aquifer Beaker

Edwards Aquifer

Aquifer Level 681.5'
6/13/19 - Official

The Edwards aquifer and its catchment area in the San Antonio region is about 8,000 square miles and includes all or part of 13 counties in south-central Texas.

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Year-Round Watering Hours

Watering with an irrigation system or sprinkler is allowed any day of the week before 11 a.m. or after 7 p.m.

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Aquifer Level 681.5 | Year-Round Watering Hours

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Commercial Programs

Non-Potable Water Tank Registration

A non-potable water tank is installed on a property to capture and store water generated from rainwater, stormwater, cooling towers, air condition condensate or other process for use again on-site, typically as irrigation. However, the water is not for human consumption.

Effective May 1, 2013: Non-potable water tanks that meet one or more of the following criteria must register with San Antonio Water System:

  • All non-potable water tanks located at a commercial or residential property with potable water back-up, regardless of tank capacity.
  • All non-potable water tanks at a commercial location with a combined storage capacity over 5,000 gallons.
  • All non-potable water tanks at a residential location with a combined storage capacity over 1,000 gallons.

* indicates required fields.

Non-Potable Water Tank Registration
Business name (if not a residential location):
* Applicant/owner First Name:
* Applicant/owner Last Name:
* Email:
* Type of property [Check one]:
Non-residential/Commercial (everything that is not a single-family home or duplex)
Source water for tank collection (check all that apply):
Condensate water
Recycled water
Cooling tower blowdown
Potable water back-up:
Yes (backflow required)
If yes, provide backflow registration number(s):[Ex. bkfl-12345]
* SAWS account number:
Exactly as it appears on your bill without spaces or dashes.
- -

Use of stored water (check all that apply):
Landscape irrigation
Cooling tower make-up water
Indoor use
If used for irrigation, are sprays or rotors used: [Check one]:
Type of treatment (check all that apply):
Number of tanks on property [Check one]:
Three or more
Total tank capacity (gallons):
* Tank location(s) on property:
* Name of responsible owner or facility/maintenance manager:
Email address:
Verify email address:
Manager Phone:
() -
* Tank Address:
* City:
* State:
* ZIP:
* Phone:
- -
- -
Legal Agreement
Please read and agree to the Agreement before submitting your registration.
I acknowledge that I have installed a backflow device as required if the tank is used in conjunction with potable water back-up. Non-potable water on-site in conjunction with potable water creates a potential high hazard cross contamination site. Additional backflow protection will be needed, i.e., a reduced pressure principal assembly (RP). Consult with a licensed irrigator concerning Texas Commission on Environmental Quality requirements.
I acknowledge that an air gap is present separating the potable water back-up and the receiving tank as required between potable back-up and the tank.
I acknowledge that if I am using water for spray irrigation, I have a treatment plan for the stored water (drip application does not need water treatment).
If I am using the non-potable water for indoor use, I have all of the above plus an expansion tank, contaminant disinfection (human consumption only - UV, activated charcoal, or both) and an annual inspection per Texas Commission on Environmental Quality requirements.
I acknowledge all backflow devices are inspected annually.
I acknowledge all pipe, fittings, heads, valve boxes and backflow boxes are an authorized purple color.
Best Management Practices
I acknowledge that routine use of a biocide is needed if non-potable water is used in conjunction with an irrigation system using spray or rotary heads.
I acknowledge that gutters, screens, and first flush diverters should be inspected monthly and cleaned as needed or a minimum of once every quarter.
I have read accept this Best Management Practices agreement. I understand and will abide by these practices as set forth by the San Antonio Water System and the State of Texas. I understand that in no way does this agreement constitute a permit or authorized use of the tank and that all regulations of the City of San Antonio and the State of Texas must be followed.
I have read and accept this Agreement and I understand and will abide by these guidelines as set forth by San Antonio Water System.

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