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Bexar County Water Quality Report & Hardness Guide

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San Antonio Water System — Main System

2026 report using 2025 data; 2024 lead samples

SAWS Main System only. The report also lists purchased-water systems; those tables are not treated as direct measurements at every San Antonio tap.

Your water at a glance

See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.

Hardness

Very hard

15–20gpg · utility’s typical range

Approximately 257–342 mg/L as CaCO₃. Above the USGS very-hard threshold of 180 mg/L. This is utility guidance, not a tap measurement.

Current SAWS FAQ; sampling year not specifiedView source

Free chlorine

Average below 4 ppm MRDL

1.46ppm

Average; range 0.16–3.7

2025View source

TTHMs

Above 80 ppb comparison; clarification needed

86.2ppb

Reported highest level; report marks no violation

The number and the report’s compliance statement conflict.

2025View source

Fluoride

Below 4 ppm MCL

0.69ppm

Maximum; range <0.5–0.69

2025View source

Lead

Below 15 ppb action level

1.6ppb

90th percentile; 0 sites over action level

A utility percentile does not rule out lead at your tap.

2024View source

PFAS

Cannot assess high or low

Not quantified here

No compound-specific result used in this summary

Ask SAWS for the current PFAS monitoring results.

2026 reportView source

Water hardness by provider

The figures below are provider-specific. They are not a countywide average.

UtilityHardnessHardness source
Very hardCurrent SAWS FAQ; sampling year not specified
View Full Water ReportOpen the measured results, dates, comparisons and original utility report.

The numbers behind your report

Selected useful results—not a replacement for the utility’s complete report. Older measurements retain their original year.

Open the complete utility report ↗

What was measuredReported amountSample year / source dateHow to read it
Hardness15–20 gpg · utility’s typical rangeCurrent SAWS FAQ; sampling year not specifiedVery hardApproximately 257–342 mg/L as CaCO₃. Above the USGS very-hard threshold of 180 mg/L. This is utility guidance, not a tap measurement.
Free chlorine1.46 ppmAverage; range 0.16–3.72025Average below 4 ppm MRDL
TTHMs86.2 ppbReported highest level; report marks no violation2025Above 80 ppb comparison; clarification neededThe number and the report’s compliance statement conflict.
HAA530.6 ppbReported highest level2025Below 60 ppb MCL
Fluoride0.69 ppmMaximum; range <0.5–0.692025Below 4 ppm MCL
Lead1.6 ppb90th percentile; 0 sites over action level2024Below 15 ppb action levelA utility percentile does not rule out lead at your tap.
PFASNot quantified here No compound-specific result used in this summary2026 reportCannot assess high or lowAsk SAWS for the current PFAS monitoring results.
Nitrate as nitrogen2.45 ppmMaximum2025Below 10 ppm MCL
Barium0.125 ppmMaximum2025Below 2 ppm MCL
Copper0.187 ppm90th percentile2024Below 1.3 ppm action level
Selenium3.1 ppbMaximum2025Below 50 ppb MCL
Combined radium 226/2281.5 pCi/LMaximum2025Below 5 pCi/L MCL
Uranium1.7 µg/LMaximum2024Below 30 µg/L MCL

ppm ≈ mg/L; ppb ≈ µg/L; ppt ≈ ng/L in drinking water. Hardness in gpg = mg/L as CaCO₃ ÷ 17.1. ND means not detected at the method’s reporting limit—not zero.

MCL is a maximum contaminant level. MRDL is a disinfectant limit. Lead/copper action levels use system sampling percentiles and are not a safe-tap threshold. TTHM/HAA5 compliance uses locational annual averages.

PFOA/PFOS comparisons use EPA’s 4 ppt values. Historical detections are not a present compliance finding; EPA assesses compliance using running annual averages. Rule implementation is being reviewed. EPA PFAS benchmarks and implementation ↗

Hardness source ↗USGS hardness classification ↗

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Source water. SAWS draws from several aquifers and some surface-water sources. Its typical hardness guidance is especially useful when choosing scale treatment.

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More about your local water

What this means for your home

Start with the system name on your bill.

Bexar County is a browsing area, not a single water system. SAWS Main System’s typical hardness guidance supports a filter-and-softener recommendation for matching homes, but does not establish the water chemistry of a private well or another utility.

Filter vs. softener: what each doesPlan installation with your plumber

Related city reports

San Antonio

Filtration for taste and odor. Softening for mineral scale.

Browse reports →

A useful local question

Does this report cover every water supplier in Bexar County?

No. The initial report covers SAWS Main System. Other utilities, separate SAWS systems and private wells must be assessed using their own current reports or water tests.

Sources and methodology

We keep each utility’s results separate, show the reported sample year, and distinguish averages, maxima and tap-sampling percentiles. Hardness classifications use USGS ranges. Missing data stays unknown.

Sources checked October 22, 2026

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