Robstown Water Hardness & Quality Report (2026)
Water Hardness
19.8 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
976.4 mg/L
Est. Daily Cost
$0.91
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 Robstown, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Robstown | 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 Robstown compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Robstown, Texas | 339.5 mg/L | 10.2 ppt | 🔴 Very Hard | mixed |
| Corpus Christi, Texas | 183 mg/L | 6.9 ppt | 🔴 Very Hard | mixed |
| Kingsville, Texas | 86.5 mg/L | 4.9 ppt | 🟡 Moderately Hard | mixed |
| Portland, Texas | 268 mg/L | 8.7 ppt | 🔴 Very Hard | mixed |
| Alice, Texas | 143 mg/L | 6.1 ppt | 🟠 Hard | mixed |
National Benchmark
How Robstown compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Robstown | 339.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Robstown's Water Unique?
Local geology and source profile
Robstown, Texas, in Nueces County — a Nueces County city adjacent to Corpus Christi and Driscoll in the Coastal Bend region of south Texas — receives its water from the City of Robstown Water Department or Corpus Christi Regional Water, drawing from the Nueces River and supplemental Gulf Coastal Plain wells through the south Texas distribution.
The extremely hard 339.5 mg/L hardness and very high TDS of 976.4 mg/L reflect the Nueces County supply's extreme calcareous character — the Cretaceous Escondido Formation and Tertiary Midway Group are both calcareous formations in the south Texas Gulf Coastal Plain, and the arid Coastal Bend climate concentrates mineral salts significantly in the Nueces River (compare Corpus Christi TX: 335/962 in Nueces County comparable; Driscoll TX: 344/990 in Nueces County comparable; Robstown consistent extremely hard from the same Nueces County Nueces River Cretaceous calcareous supply). The Nueces watershed — Cretaceous Escondido Formation (calcareous — primary hardness contributor), Tertiary Midway Group (calcareous — secondary contributor), and Quaternary Coastal Bend alluvium (calcareous — TDS contributor).
At 339.5 mg/L with TDS 976, Robstown's water is extremely hard — a whole-house water softener is essential. A reverse osmosis system is strongly recommended for drinking. The PFAS level of 10.2 ppt is very high — a certified filter with PFAS removal is strongly recommended — the Nueces County south Texas military (NAS Corpus Christi) and petrochemical legacy contributes to Robstown's very elevated PFAS readings.
Geology & Source: Robstown in Nueces County draws from the City of Robstown Water on the Nueces River (Nueces County, south Texas) — the Nueces watershed at Nueces County drains Cretaceous Escondido Formation (calcareous) and Tertiary Midway Group (calcareous) — Texas Nueces County Nueces River Cretaceous calcareous supply produces extremely hard water at 339.5 mg/L with TDS 976.4 mg/L.