San Antonio Water Quality: What You Need to Know in 2026

San Antonio gets its water primarily from the Edwards Aquifer, one of the most productive artesian aquifers in the world. While this groundwater source is naturally clean in many ways, it passes through extensive limestone formations that give it some distinctive characteristics.

The most notable feature of San Antonio water is its hardness. Our water typically measures between 15-25 grains per gallon, which is considered very hard. This is significantly above the national average and is the primary reason so many local homeowners deal with scale buildup and dry skin.

San Antonio Water System (SAWS) treats our water to meet all EPA standards, adding chlorine for disinfection and fluoride for dental health. While the water is technically safe to drink, many residents notice taste and odor issues from chlorine treatment.

Common water quality concerns in the San Antonio area include:

Hard water minerals that cause scale, reduce appliance life, and leave spots on everything. This is the number one complaint from local homeowners.

Chlorine taste and odor, especially noticeable in summer months when treatment plants increase chlorine levels to combat bacteria growth in warmer distribution pipes.

Total dissolved solids (TDS) that contribute to an overall mineral taste. San Antonio TDS levels often exceed 400 parts per million.

Occasional elevated lead levels in homes with older plumbing. While SAWS water leaves the treatment plant lead-free, it can pick up lead from aging pipes and fixtures in your home.

The good news is that all of these issues are easily addressed with the right water treatment system. A combination of water softening and carbon filtration handles the vast majority of concerns, while a reverse osmosis system provides an extra level of purification for drinking water.

The first step is understanding exactly what is in your water. A free water test from True H2O gives you a clear, detailed picture of your water quality so you can make informed decisions about treatment.