Aquifer Beaker

Edwards Aquifer

Aquifer Level 635.3'
12/12/14 - 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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Landscape Watering
Last Digit of Address Watering Day
0 or 1 Monday
2 or 3 Tuesday
4 or 5 Wednesday
6 or 7 Thursday
8 or 9 Friday
No Watering on Weekends

Stage 2:
Water On Your Day

Watering with an irrigation system or sprinkler is allowed only once a week from 7-11 a.m. and 7-11 p.m. on your designated watering day as determined by your address.

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Aquifer Level 635.3 | Stage 2: Water On Your Day

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Fluoride

Fluoride

Q.

Does everyone in San Antonio receive fluoridated water?

A.

Preguntas y respuestas de fluoruro
en español

The city ordinance that was approved by voters on Nov. 7, 2000 directed all direct suppliers of drinking water through piping systems serving properties within the City of San Antonio to fluoridate all water supplies within their distribution systems. SAWS complies with the ordinance and adds fluoride to all water within its system.

Q.

When did fluoridation of San Antonio's water supply begin?

A.

SAWS and the former Bexar Metropolitan Water District (now part of SAWS) started adding fluoride to our distribution systems in August 2002.

Q.

What form of fluoride is added to our water?

A.

Hydrofluorosilicic acid (H2SiF6) is used. The fluoride meets standards set by the American Water Works Association (AWWA) and the National Sanitation Foundation (NSF), organizations that set standards for potable, or drinkable, water.

Q.

How is fluoride added to the water?

A.

Fluoride is added to the water at each of our water pump stations. Fluoride at each station is stored in bulk storage tanks. Fluoride is manually transferred from the bulk tanks to smaller day tanks each day to meet pumping requirements. Metering pumps then move the fluoride from day tanks to the water as it is pumped from the well. Fluoride injection pumps operate only when water wells are operating.

Q.

What is the concentration of fluoride?

A.

Fluoride already occurs naturally in San Antonio's water at 0.3 parts per million. SAWS adds enough fluoride to bring the fluoride level up to 0.8 parts per million, the recommended level that experts say is necessary to protect teeth against decay. Water from the Trinity Aquifer is naturally fluoridated at near the recommended levels and therefore requires no additional fluoride. Learn more about our Trinity Aquifer water supply.

Q.

How much does it cost to fluoridate our water?

A.

In 2011, SAWS fluoridated 55.4 billion gallons of water at a cost of $572,880. That works out to 1 cent per 1,000 gallons.

Q.

How can I be sure that the level of fluoride in my water is safe?

A.

Multiple levels of checks and double-checks are included in the fluoride system, including:

  • Fail-safe devices and procedures at the injection sites.
  • Calibrated measuring devices used in injection pumps.
  • Daily testing by SAWS technicians.
  • Verification of usage amount at site by weight.

Q.

If I don't want fluoride in my water, how can I remove it?

A.

Customers can purchase reverse osmosis filtration systems that can remove fluoride from the water. Reverse osmosis is a very high level of filtration that removes up to 98% of dissolved minerals — including chlorine and fluoride — as well as virtually 100% of colloidal and suspended matter. Reverse osmosis filters are available in under-sink models.