Short answer: No measured result is above a legal limit; lithium sits above a screening level, and the water is very hard. San Antonio Water System serves 2,643,729 residents.
Your water bill or annual water quality report names your actual supplier.
SAN ANTONIO WATER SYSTEM (EPA PWSID TX0150018) delivers surface water to 2,643,729 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. The utility's 2025 CCR reports very hard water and chlorine disinfection.
0health-based violations in the last 10 years
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
lead 1.6 µg/L, below the 15 µg/L action level (detected below the limit); 43 galvanized lines to replace (context, not a tap measurement)
PFBS 3.8 ng/L, below the 2000 ng/L EPA health advisory (+2 more PFAS detected)
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Varify
17 strip readings, including lead, chlorine, fluoride, iron and hardness, plus 2 coliform bacteria tests
What it can't tell you: Strip colors give rough ranges, not lab numbers, and it cannot detect PFAS or arsenic.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Each card names which San Antonio findings its current certification covers, and which it doesn't.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For San Antonio, PFAS were detected below their limits, and PFBA 9.2 ng/L and PFPeA 3.2 ng/L with no federal or state limit; the lead 90th-percentile result was 1.6 µg/L against the 15 µg/L action level. SAN ANTONIO WATER SYSTEM (PWSID TX0150018) has a Purity Score of 95/100 (confidence: high), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.
SAN ANTONIO WATER SYSTEM (PWS ID TX0150018) is the public water system on record for San Antonio, Texas, serving about 2,643,729 people. Confirm the utility on your water bill before acting on a specific finding.
Surface water (primary source of record in EPA SDWIS).
In EPA's UCMR 5 testing (2023-05-08 to 2026-06-16), PFBS was detected at 3.8 ng/L, below the 2,000 ng/L EPA health advisory. PFBA (9.2 ng/L) and PFPeA (3.2 ng/L) were also detected; they have no federal or state limit.
SAN ANTONIO WATER SYSTEM's most recent lead 90th-percentile result (2022–2024) was 1.6 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
PurityMap's current record for San Antonio holds 34 findings: 2 above a reference, 4 detected within the reference, 2 detected with no limit and 26 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.
San Antonio's water is recorded as 17.5 gpg, very hard. Hardness is an aesthetic and plumbing characteristic, not a health-based limit.
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Perfluorobutanesulfonic acid (PFBS)
Perfluoropentanoic acid (PFPeA)
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorooctanesulfonic acid (PFOS)
Perfluoropentanesulfonic acid (PFPeS)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)
Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.
UCMR5 Analytical Results
UCMR5 Analytical Results: SAN ANTONIO WATER SYSTEM (TX0150018)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: SAN ANTONIO WATER SYSTEM (TX0150018)
US EPA SDWIS
Consumer Confidence Report (CCR)
San Antonio Water System (SAWS) 2025 Consumer Confidence Report (CCR)
San Antonio Water System (SAWS)
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Start with the hot-or-cold tap check. Where San Antonio Water System reported something related, it's shown below.
San Antonio disinfects with chlorine (utility water-quality report).
Lead at San Antonio Water System: 1.6 µg/L (90th percentile, 2022–2024 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.