San Antonio water quality
Know your water.
Choose with confidence.
Local reports are a useful starting point. Read them with context, then connect the information to your household’s water and goals.
First, a little context
Water quality has
more than one measure.
A supply can meet federal drinking-water standards and still have hardness or a taste you would like to improve. Regulatory compliance, household comfort, and treatment preferences are different questions.
SAWS’ 2026 main-system report says the system received no violations in 2025. It summarizes monitoring data, not a test of every home’s plumbing or every substance at every tap.
Use your own provider’s report. A San Antonio mailing address does not automatically mean you receive water from the SAWS main system.
Hard water · SAWS typical range
15–20 gpg
Grains per gallon measures hardness. SAWS lists this typical range in its water-quality FAQ; your address and supply can differ.
Calcium and magnesium are naturally occurring. Hardness itself is not a health hazard, but it can contribute to scale and soap residue.
Explore water softening →Two sources. Different purposes.
Read the report.
Understand the benchmark.
Your utility’s regulatory report
SAWS & public water reports
The Consumer Confidence Report explains sources, monitored substances, measurement periods, regulatory limits, and violations. Check the year and the public-water-system ID.
The SAWS main system is TX0150018. The 2026 report includes 2025 monitoring and some earlier collection dates.
Open the SAWS report library ↗An independent health benchmark
EWG’s Tap Water Database
EWG compares utility testing with its selected health guidelines. Those guidelines differ from enforceable federal drinking-water limits.
The SAWS entry covers historical data from 2015–2024. An exceedance of an EWG guideline is not automatically a regulatory violation or a measurement at your kitchen tap.
View the EWG SAWS entry ↗Terms you may come across
Plain language.
Practical next steps.
| Term or concern | What it means | What to ask |
|---|---|---|
| Hardness | Calcium and magnesium dissolved in water; associated with scale and mineral spots. | What is my measured hardness, and is softening appropriate? |
| Chlorine / chloramine | Disinfectants used by utilities. Some people notice their taste or odor. | Which disinfectant does my supplier use? Is the proposed media designed for it? |
| TTHMs / haloacetic acids | Groups of byproducts that can form during disinfection. Reports may list individual results and annual averages. | What do the current report and the exact filter’s reduction documentation say? |
| Lead | Household plumbing and service-line materials can affect lead at the tap. | Does my plumbing warrant a certified laboratory test and a filter with a specific lead-reduction claim? |
| Total dissolved solids | A broad measure of dissolved substances. A TDS meter does not identify each contaminant. | Which specific substance am I trying to reduce, and how was it tested? |
Bring it back to your home
A report is a start.
Your tap adds context.
Begin with your water provider, what you notice at home, and your treatment goals. Ask which measurements are included in an in-home test.
A basic water analysis cannot identify every possible contaminant. Specific health-related concerns may require a certified laboratory and advice from your utility or a qualified professional.
Choose equipment with documented performance for the concern you want to address. No single treatment is a universal solution.
Talk about your water →Does an EWG exceedance mean my utility violated the law?
Not necessarily. EWG’s health benchmarks and enforceable federal limits have different purposes. Read the utility’s current report for regulatory compliance and measurement context.
Can a home test tell me whether my water is safe?
A basic test of characteristics such as hardness or TDS does not screen for every contaminant. Ask about the test scope. Specific concerns can require a certified laboratory.
Which report applies to my address?
Check the provider on your water bill and the public-water-system ID. SAWS has multiple systems, and surrounding communities may have different providers or private wells.