Summerlin South Water Hardness & Quality Report (2026)
Water Hardness
24.2 grains per gallon
Source
groundwater
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
1351.8 mg/L
Est. Daily Cost
$1.00
energy & soap waste
Source: USGS Water Quality Portal · 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 Summerlin South, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Summerlin South | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Summerlin South compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Summerlin South, Nevada | 414.5 mg/L | 4.4 ppt | 🔴 Very Hard | groundwater |
| Spring Valley, Nevada | 373.5 mg/L | 4.1 ppt | 🔴 Very Hard | groundwater |
| Enterprise, Nevada | 161.5 mg/L | 2.5 ppt | 🟠 Hard | groundwater |
| Paradise, Nevada | 316.5 mg/L | 3.6 ppt | 🔴 Very Hard | groundwater |
| Las Vegas, Nevada | 253.5 mg/L | 3.2 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Summerlin South compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Summerlin South | 414.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Summerlin South's Water Unique?
Local geology and source profile
Summerlin South, Nevada, in Clark County on the western edge of the Las Vegas Valley against the Spring Mountains and Red Rock Canyon National Conservation Area — a master-planned community and one of the fastest-growing residential areas in the US — receives its water from the Las Vegas Valley Water District (LVVWD) and Southern Nevada Water Authority (SNWA), drawing from both Lake Mead (Colorado River) and local Las Vegas Valley groundwater wells. The groundwater component in the western Las Vegas Valley taps aquifer zones particularly influenced by the nearby Spring Mountains carbonate terrain.
The extreme 414.5 mg/L hardness and extreme TDS of 1,351.8 mg/L reflect the Las Vegas Valley's dual water quality challenge: Colorado River hardness plus desert valley groundwater contact with Paleozoic carbonate and evaporite formations. The Spring Mountains directly west of Summerlin are composed of Cambrian and Devonian limestone, Permian Kaibab Limestone, and Bird Spring Formation carbonates — ancient marine reef and platform carbonates. Local groundwater percolating through these formations dissolves extraordinary amounts of calcium and sulfate. Desert heat intensifies evaporative concentration in both open water systems and shallow aquifer zones, pushing TDS to over 1,300 mg/L in groundwater-dominant supply areas.
At 414.5 mg/L and TDS over 1,350 mg/L, Summerlin South residents face among the most extreme hard water conditions of any community in the United States. Water softeners are universally installed — they are considered baseline household infrastructure alongside refrigerators and HVAC systems in the Las Vegas Valley. Scale deposits form on surfaces within hours, dishwashers require water softener treatment to function acceptably, and tile and glass quickly develop visible calcium crust. Reverse osmosis drinking water systems are equally standard in Summerlin South homes — the mineral taste and quality of unfiltered tap water at this TDS level is unacceptable for daily consumption without treatment.
Geology & Source: Summerlin South in Clark County draws from Las Vegas Valley groundwater — the valley aquifer contacts Paleozoic Bird Spring and Kaibab Formation carbonates and Permian evaporites of the Spring Mountains, with intense desert evaporative concentration — carbonate and evaporite dissolution produces extreme hardness at 414.5 mg/L and extreme TDS of 1,352 mg/L.