Head-to-head water quality

Fort Worth, TX vs San Antonio, TX

Side-by-side water quality comparison: Fort Worth (Grade F) vs San Antonio (Grade F). Lead, PFAS, violations, and source-water contamination

Score breakdown

Each factor is shown as raw points (out of the maximum). Higher = better.

Factor

Fort Worth

San Antonio

Better

Violations subscore / 45

0.0

Tie

Lead/Copper subscore / 20

18.0

16.0

Fort Worth

Contaminant subscore / 20

7.5

10.1

San Antonio

Compliance subscore / 10

5.0

3.0

Fort Worth

Source subscore / 5

4.0

Tie

Lead & copper at the tap

Lead and Copper Rule (LCR) 90th-percentile readings — the value that 10% of sampled homes exceed.

Factor

Fort Worth

San Antonio

Better

Lead 90th-percentile (latest) · EPA action level: 15 µg/L

0.0 µg/L

San Antonio

Copper 90th-percentile (latest) · EPA action level: 1.3 mg/L

—

1.5 mg/L

San Antonio

PFAS — "forever chemicals"

UCMR 5 testing, 2023–2025. Federal MCLs: PFOA + PFOS = 4 ng/L; HFPO-DA = 10 ng/L.

Factor

Fort Worth

San Antonio

Better

PFAS analytes detected

8 of 30

4 of 30

San Antonio

PFAS exceeds federal MCL

Yes

San Antonio

PFAS hazard index · Sum of (max/MCL) across detected analytes; > 1 indicates exceedance

3.90

—

Fort Worth

Violation history

SDWA enforcement actions — fewer is better.

Factor

Fort Worth

San Antonio

Better

Violations (last 5 years)

144

San Antonio

Health-based violations (total)

Tie

Unresolved violations

221

212

San Antonio

Other contaminants tested

UCMR rounds 1–4 + UCMR 5 lithium. Maxima where data exists; "—" means not tested.

Factor

Fort Worth

San Antonio

Better

Chromium-6 (max)

0.14 µg/L

1.80 µg/L

Fort Worth

HAA5 (avg)

5.56 µg/L

3.96 µg/L

San Antonio

Manganese (max)

4.19 µg/L

6.40 µg/L

Fort Worth

Strontium (max)

330.00 µg/L

9800.00 µg/L

Fort Worth

1,4-Dioxane (max)

—

0.58 µg/L

San Antonio

NDMA (max)

6.00 ng/L

—

Fort Worth

Vanadium (max)

1.60 µg/L

33.00 µg/L

Fort Worth

Chlorate (max)

720.00 µg/L

64.00 µg/L

San Antonio

Molybdenum (max)

2.50 µg/L

9.20 µg/L

Fort Worth

Industrial proximity

Superfund National Priorities List + Toxic Release Inventory facilities within 10 miles of the city centroid.

Factor

Fort Worth

San Antonio

Better

Superfund sites within 10 mi

Fort Worth

TRI lbs to surface water within 10 mi (2023)

1,369

251

San Antonio

System size & source

Factor

Fort Worth

San Antonio

Population served

964K

2.2M

—

Water source

Surface water

Purchased surface water

—

Number of water systems

—

See the full reports

Full report

Fort Worth, TX water quality

Grade F · 964K served

Full report

San Antonio, TX water quality

Grade F · 2.2M served

All cities in Texas →

Frequently asked

Which has better water — Fort Worth or San Antonio?

Fort Worth, TX scores higher (34.5 vs 33.1) on WaterVerge's 100-point methodology, earning a Grade F compared to San Antonio's Grade F. The score combines violation history, lead and copper levels, contaminant testing, monitoring compliance, and source-water type.

How is the WaterVerge water quality score calculated?

The grade combines five subscores: violation history (45 pts, weighted by recency and health-based severity), lead/copper 90th-percentile vs EPA action levels (20 pts), contaminant testing including PFAS, chromium-6, HAA5, NDMA, perchlorate, and Superfund/TRI proximity (20 pts), monitoring compliance (10 pts), and water-source-type risk (5 pts). Full methodology at /about/methodology.

Where does this water quality data come from?

From the EPA's public records: the SDWIS bulk download (violations + system info), UCMR rounds 1–5 (unregulated contaminant testing including PFAS, chromium-6, HAA5, NDMA, perchlorate, vanadium, lithium), the EPA Toxic Release Inventory (industrial polluters), the Superfund National Priorities List, the USGS Powell Domestic-Well Database (private-well chemistry), and the CDC Community Water Fluoridation system. Data is refreshed quarterly.