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

The USA national average is 151 mg/L. Coppell (≈ 180+ mg/L) is 189 mg/L harder than average.

Coppell Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.8

neutral = 7.0

Lead

0.003 mg/L

✓ Below action level

TDS

226 mg/L

Est. Daily Cost

$0.91

energy & soap waste

Source: See methodology section below · Updated 2026

very hard180+ mg/LVery Hard · 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 Coppell, your appliances are currently losing 45% efficiency due to mineral buildup.

Appliance	In Coppell	Soft Water City	Efficiency Loss
Kettle	4.7 yrs	8.5 yrs	-45%
Washing Machine	6.6 yrs	12 yrs	-45%
Water Heater	8.3 yrs	15 yrs	-45%

Regional Water Comparison

How Coppell compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Coppell, Texas	≈ 180+ mg/L	63.5 ppt	🔴 Very Hard	reservoir
Grapevine, Texas	117 mg/L	289.2 ppt	🟡 Moderately Hard	reservoir
Lewisville, Texas	≈ 120–179 mg/L	140.8 ppt	🟠 Hard	reservoir
Flower Mound, Texas	≈ 180+ mg/L	290.9 ppt	🔴 Very Hard	reservoir
Southlake, Texas	≈ 120–179 mg/L	97.8 ppt	🟠 Hard	reservoir

National Benchmark

How Coppell compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Coppell	≈ 180+ mg/L	🔴 High
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Coppell's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 226 mg/LpH: 7.8

The City of Coppell Water System, established in 1955, serves approximately 45,000 residents in Coppell, Texas, within Dallas County. Water is purchased from Dallas Water Utilities, sourcing from surface reservoirs including Lake Tawakoni, Lake Ray Hubbard, Lake Fork, and the Elm Fork of the Trinity River — itself fed by Lake Ray Roberts, Lake Lewisville, and Lake Grapevine. Treatment is handled by Dallas Water Utilities and regional partners including the Upper Trinity Regional Water District.

The Trinity River watershed drains a vast area of North Texas, with reservoirs capturing runoff from limestone-dominated terrains. Cretaceous-era chalk and limestone formations underlie the region — remnants of ancient seabeds — contributing dissolved minerals as water flows through rivers and accumulates in lakes. These carbonate-rich layers dissolve calcium and magnesium, creating a characteristically very hard supply without groundwater influence.

Very hard water in Coppell accelerates scale buildup in water heaters, reducing efficiency by up to 29% and requiring replacement every 6–8 years instead of 12–15. Dishwashers, washing machines, and faucets are also affected, with extra detergent use, higher energy bills, and frequent repairs common. A water softener is strongly recommended for all households. Coppell holds a Superior Public Water Supply rating from the Texas Commission on Environmental Quality (TCEQ); 2024 reports confirm compliance exceeding state and federal standards. Fluoride is added; arsenic from natural deposits has been detected above health guidelines in third-party tests.

Geology & Source: Trinity River watershed, North Texas — Cretaceous limestone and chalk formations overlie Trinity Aquifer region; ancient seabed carbonates dissolve calcium and magnesium into reservoir supply, yielding very hard water

Other Texas Water Reports

Grapevine

117 mg/L

🟡 Moderately Hard

Lewisville

≈ 120–179 mg/L

🟠 Hard

Flower Mound

≈ 180+ mg/L

🔴 Very Hard

Southlake

≈ 120–179 mg/L

🟠 Hard

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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.

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Frequently Asked Questions

Is Coppell's water safe to drink?

Yes. Coppell's water meets all federal safety standards. The hardness is ≈ 180+ mg/L (Very Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Coppell?

At ≈ 180+ mg/L (Very Hard), Coppell'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 45%.

How does Coppell compare to the USA average?

The USA national average is 151 mg/L. Coppell (≈ 180+ mg/L) is 189 mg/L above the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Coppell 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.