How does Dallas's water compare to the national average?

The USA national average is 151 mg/L. Dallas (≈ 120–179 mg/L) is 1 mg/L softer than average.

Dallas Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

neutral = 7.0

Lead

0.004 mg/L

✓ Below action level

TDS

192 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

0–60

mg/L

Soft

61–120

mg/L

Moderately Hard

121–180

mg/L

Hard

180+

mg/L

Very Hard

Appliance Damage Report

In Dallas, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Dallas	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How Dallas compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Dallas, Texas	≈ 120–179 mg/L	5 ppt	🟠 Hard	reservoir
University Park, Texas	≈ 120–179 mg/L	10 ppt	🟠 Hard	mixed
Irving, Texas	≈ 120–179 mg/L	393.5 ppt	🟠 Hard	reservoir
Duncanville, Texas	≈ 180+ mg/L	89.2 ppt	🔴 Very Hard	reservoir
Farmers Branch, Texas	≈ 180+ mg/L	139.6 ppt	🔴 Very Hard	reservoir

National Benchmark

How Dallas compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Dallas	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Dallas's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 192 mg/LpH: 8

Dallas Water Utilities (DWU) serves over 1.3 million customers across Dallas County and surrounding areas of the Dallas-Fort Worth metroplex. Primary sources are surface reservoirs in the Trinity River watershed: Lake Fork Reservoir, Lake Ray Hubbard, Lake Tawakoni, and smaller reservoirs including White Rock Lake. Water is treated at three major plants—the John Ellis, Bachman, and William C. Welch plants—using coagulation, sedimentation, filtration, and disinfection. DWU holds a 'Superior Public Water Supply' rating from the Texas Commission on Environmental Quality.

The supply draws from the Trinity River watershed, which spans Cretaceous sedimentary formations across North Texas. Limestone and dolomite dominate the geology of Dallas and Tarrant Counties, leaching minerals into reservoirs as water flows through carbonate-rich rock layers; gypsum deposits from the Trinity Group aquifers contribute additional dissolved minerals. This limestone-heavy terrain produces elevated calcium and magnesium characteristic of the region's hard water profile, without relying on direct groundwater extraction.

Dallas's hard water causes scale buildup in pipes, heaters, and fixtures, reducing water heater efficiency and potentially shortening lifespan by 30–50%; dishwashers and washing machines are also affected. Soap lathering diminishes, leaving spots on glassware and dry skin. Annual appliance descaling, vinegar soaks for faucets, and low-flow aerators are recommended. A whole-home water softener is strongly advised. DWU water maintains pH 7.0–8.5 and meets EPA lead/copper rules; the 2024 report notes disinfection byproducts and trace PFAS below limits, with no major violations. Chloramination provides residual disinfection; minor chlorine taste may occur.

Geology & Source: Trinity River watershed — Cretaceous limestone, dolomite, and gypsum-bearing Trinity Group formations; surface water leaches calcium and magnesium through carbonate strata of North Texas, producing hard supply

Hardness Varies Across Dallas — Find Your Area

City average is ≈ 120–179 mg/L. Individual ZIP areas differ.

* ZIP code estimates are derived from the city-wide measurement. Actual readings may vary slightly by neighbourhood.

ZIP Code	Neighbourhood	Hardness (mg/L)	Risk Level
75205	University Park area	≈ 145	🟠 Hard
75207	Design District	≈ 145	🟠 Hard
75203	South Dallas	≈ 146	🟠 Hard
75204	East Dallas	≈ 146	🟠 Hard
75209	Bluffview	≈ 146	🟠 Hard
75214	Lakewood	≈ 147	🟠 Hard
75219	Oak Lawn	≈ 147	🟠 Hard
75202	Dallas CBD	≈ 149	🟠 Hard
75215	South Dallas East	≈ 151	🟠 Hard
75201	Downtown	≈ 153	🟠 Hard
75206	M Streets	≈ 153	🟠 Hard
75208	Oak Cliff	≈ 154	🟠 Hard

Other Texas Water Reports

University Park

≈ 120–179 mg/L

🟠 Hard

Irving

≈ 120–179 mg/L

🟠 Hard

Duncanville

≈ 180+ mg/L

🔴 Very Hard

Farmers Branch

≈ 180+ mg/L

🔴 Very Hard

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Dallas's water safe to drink?

Yes. Dallas's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Dallas?

At ≈ 120–179 mg/L (Hard), Dallas's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Dallas compare to the USA average?

The USA national average is 151 mg/L. Dallas (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Dallas is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.