Lewisville Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
7.9
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
182 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: See methodology section below · Updated 2026
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 Lewisville, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Lewisville | 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 Lewisville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lewisville, Texas | ≈ 120–179 mg/L | 140.8 ppt | 🟠 Hard | reservoir |
| Highland Village, Texas | ≈ 120–179 mg/L | 97.8 ppt | 🟠 Hard | reservoir |
| Coppell, Texas | ≈ 180+ mg/L | 63.5 ppt | 🔴 Very Hard | reservoir |
| Flower Mound, Texas | ≈ 180+ mg/L | 290.9 ppt | 🔴 Very Hard | reservoir |
| The Colony, Texas | ≈ 0–60 mg/L | 182.1 ppt | 🟢 Soft | reservoir |
National Benchmark
How Lewisville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lewisville | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
Bring Scarsdale-quality water to your Lewisville home
Shop water softeners on Amazon.com →
What Makes Lewisville's Water Unique?
Local geology and source profile
The City of Lewisville Water Utility serves over 100,000 residents in Lewisville, Denton County, Texas, within the Dallas-Fort Worth metro area. Water is sourced from the Elm Fork of the Trinity River and six reservoirs: Grapevine Lake, Lewisville Lake, Ray Roberts Lake, Lake Ray Hubbard, Lake Fork, and Lake Tawakoni. The utility treats water through facilities managed under the North Texas Municipal Water District (NTMWD) partnership, distributing to neighborhoods including Town Center, Lake Park, and Castle Hills. Annual water quality reports are published at cityoflewisville.com and the utility can be reached at 972-219-3400.
The Trinity River watershed, spanning over 17,000 square miles, feeds these reservoirs through Cretaceous-period formations including Edwards Plateau limestones, Trinity sands, and karstic Fredericksburg and Washita group limestones. Natural dissolution of calcium and magnesium from these carbonate formations imparts a moderately mineralised character to the water. The underlying Trinity Aquifer is not utilized due to historical quality issues, leaving the supply entirely dependent on surface reservoirs shaped by the limestone-dominated basin geology.
Moderately hard water causes moderate scale buildup in water heaters, dishwashers, and coffee makers, reducing efficiency over time. Laundry may feel stiffer and soap lathering is less effective. Regular vinegar descaling, installing drain screens, and flushing heaters annually are recommended; a water softener is often advised to extend appliance life. The utility complies with EPA standards with no active health-based violations reported through 2023. Potential contaminants including TTHMs, haloacetic acids, and nitrates are monitored; lead and copper rule compliance is maintained via corrosion control, and pH is typically neutral.
Geology & Source: Trinity River watershed — Cretaceous karstic Fredericksburg and Washita limestones with Woodbine sandstones dissolve calcium and magnesium; six surface reservoirs yield moderately mineralised supply; Trinity Aquifer not used
Other Texas Water Reports
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 Lewisville's water safe to drink?
Do I need a water softener in Lewisville?
How does Lewisville compare to the USA average?
Data Sources & Methodology
Water quality data for Lewisville is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
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.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
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.
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.
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.
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.