Rio Grande City Water Hardness & Quality Report (2026)
Water Hardness
16.7 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
772.6 mg/L
Est. Daily Cost
$0.76
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 Rio Grande City, your appliances are currently losing 38% efficiency due to mineral buildup.
| Appliance | In Rio Grande City | 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 Rio Grande City compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rio Grande City, Texas | 286 mg/L | 9.1 ppt | 🔴 Very Hard | mixed |
| Alton, Texas | 189 mg/L | 7.1 ppt | 🔴 Very Hard | mixed |
| Mission, Texas | 172.5 mg/L | 6.7 ppt | 🟠 Hard | mixed |
| McAllen, Texas | 266 mg/L | 8.7 ppt | 🔴 Very Hard | mixed |
| Hidalgo, Texas | 344.5 mg/L | 10.3 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Rio Grande City compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rio Grande City | 286 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Rio Grande City's Water Unique?
Local geology and source profile
Rio Grande City, Texas, in Starr County — the Starr County seat on the Rio Grande adjacent to Mission and the Mexico border in south Texas — receives its water from the Rio Grande City Water System, drawing from the Rio Grande (Starr County) through the south Texas water treatment system.
The extremely hard 286 mg/L hardness and very high TDS of 772.6 mg/L (TDS highly elevated — reflecting the Rio Grande's severe evaporitic mineral enrichment from the Chihuahuan Desert drainage at the south Texas border position) reflect the south Texas Rio Grande supply's extreme evaporitic calcareous character — among the hardest in the USA dataset. The Rio Grande at Starr County carries drainage from the Chihuahuan Desert — Cretaceous Edwards Plateau Limestone (calcareous — primary hardness contributor), Permian Castile Formation (gypsum-evaporitic — primary TDS contributor from the Pecos River input), and intense evapotranspiration concentration in the arid south Texas desert valley.
At 286 mg/L with TDS 772, Rio Grande City's water is extremely hard. A water softener is strongly recommended, and a reverse osmosis system is essential for drinking water due to the very high TDS. The PFAS level of 9.1 ppt warrants a certified reverse osmosis drinking water filter — Rio Grande Valley border agricultural and industrial operations contribute to readings.
Geology & Source: Rio Grande City in Starr County draws from the Rio Grande City Water System on the Rio Grande (Starr County, south Texas) — the Rio Grande at Starr County carries drainage from the Chihuahuan Desert (Cretaceous Edwards Plateau calcareous — evaporitic) and Pecos River evaporitic dissolution — Texas Starr County Rio Grande Chihuahuan Desert Cretaceous evaporitic calcareous produces extremely hard water at 286 mg/L with TDS 772.6 mg/L.