Tap water quality in San Antonio, Texas
San Antonio's water systems logged 12 health-based EPA violations in 2021–2026, most recently in 2024 — most often lead and copper rule revisions. Health-based violations mean a federal limit or treatment standard was exceeded; check the systems below and your utility's annual report for specifics.
Averages describe states, not your faucet. A certified home water test screens for lead, nitrates, bacteria and dozens of other contaminants — the same categories EPA regulates.
Test your water at homeWe may earn a commission if you request quotes through this link. It costs you nothing and never affects the data we publish.
San Antonio tap water FAQ
Is tap water safe to drink in San Antonio?
San Antonio's systems logged 12 health-based violations in 2021–2026, most commonly lead and copper rule revisions. A violation is a red flag for a period of time, not a permanent condition — your utility's current Consumer Confidence Report shows today's status, and a certified home test shows what's at your tap.
Who supplies San Antonio's water?
San Antonio Water System (serving about 2,113,151 people); Jbsa - Sam Houston (serving about 37,563 people); Jbsa - Randolph (serving about 10,949 people); City Of Alamo Heights (serving about 7,357 people). Data: EPA Safe Drinking Water Information System, July 2026.
How hard is the water in San Antonio?
City-level hardness isn't published in a single federal dataset, but Texas averages 268 PPM — "very hard" on the USGS scale. Your utility's water quality report lists San Antonio's exact hardness, or a $10 test strip tells you in a minute. If it comes back over 120 PPM, see our water softener guidance in the purification calculator.
Do I need a water filter in San Antonio?
With 12 health-based violations on record in 2021–2026, a certified filter is reasonable insurance here: reverse osmosis ($150–$1,300 installed, Angi 2026) covers lead, nitrates and PFAS at the tap. Test first ($50–$200) so you buy for what's actually present.
Averages describe states, not your faucet. A certified home water test screens for lead, nitrates, bacteria and dozens of other contaminants — the same categories EPA regulates.
Test your water at homeWe may earn a commission if you request quotes through this link. It costs you nothing and never affects the data we publish.