Mercedes Water Hardness & Quality Report (2026)
Water Hardness
23.5 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
1239.6 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 Mercedes, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Mercedes | 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 Mercedes compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mercedes, Texas | 402.5 mg/L | 11.6 ppt | 🔴 Very Hard | mixed |
| Weslaco, Texas | 247 mg/L | 8.3 ppt | 🔴 Very Hard | mixed |
| Donna, Texas | 268.5 mg/L | 8.8 ppt | 🔴 Very Hard | mixed |
| Alamo, Texas | 120 mg/L | 5.6 ppt | 🟠 Hard | mixed |
| Harlingen, Texas | 171 mg/L | 6.7 ppt | 🟠 Hard | mixed |
National Benchmark
How Mercedes compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mercedes | 402.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mercedes's Water Unique?
Local geology and source profile
Mercedes, Texas, in Hidalgo County — a Hidalgo County city adjacent to Weslaco and Mission in the lower Rio Grande Valley of south Texas — receives its municipal water from the Mercedes Water Division or the Hidalgo County Water Control District, drawing from the Rio Grande River through the Rio Grande Valley irrigation canal and treatment system (Hidalgo County).
The extremely hard 402.5 mg/L hardness and very high TDS of 1,239.6 mg/L make Mercedes one of the hardest water supplies in the entire USA. The Rio Grande at the lower Rio Grande Valley accumulates mineral loading from the entire Chihuahuan Desert drainage basin — Cretaceous Tamaulipas Limestone (calcareous — major hardness source from the Sierra Madre Oriental Mexico headwaters), Permian Cupido Formation (very calcareous), and Chihuahuan Desert evaporitic minerals (calcium sulfate and sodium sulfate from the Permian-evaporite desert basin — dramatically elevating TDS above carbonate hardness alone). The cumulative calcareous and evaporitic loading produces the exceptional hardness and TDS.
At 402.5 mg/L with TDS 1,240, Mercedes' water is one of the hardest in the USA. A water softener is absolutely essential. Scale forms immediately on all surfaces, appliance lifespans are critically shortened, and water heaters fail within 2 years without treatment. The PFAS level of 11.6 ppt warrants a certified reverse osmosis drinking water filter — Naval Air Station Corpus Christi (AFFF — migrating down the Rio Grande corridor), and the lower Rio Grande Valley agricultural PFAS background contribute to Mercedes' very elevated readings.
Geology & Source: Mercedes in Hidalgo County draws from the Mercedes Water Division on the Rio Grande (Hidalgo County, south Texas) — the Rio Grande at Hidalgo County drains the Sierra Madre Oriental (Cretaceous Tamaulipas Limestone, Permian Cupido calcareous, evaporitic Chihuahuan Desert minerals) — Texas Hidalgo County Rio Grande Cretaceous-Permian calcareous watershed produces extremely hard water at 402.5 mg/L with TDS 1239.6 mg/L in this Hidalgo County Texas city.