Rockport Water Hardness & Quality Report (2026)
Water Hardness
21.6 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
1098.7 mg/L
Est. Daily Cost
$0.99
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 Rockport, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Rockport | 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 Rockport compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rockport, Texas | 369.5 mg/L | 10.9 ppt | 🔴 Very Hard | mixed |
| Portland, Texas | 268 mg/L | 8.7 ppt | 🔴 Very Hard | mixed |
| Corpus Christi, Texas | 183 mg/L | 6.9 ppt | 🔴 Very Hard | mixed |
| Robstown, Texas | 339.5 mg/L | 10.2 ppt | 🔴 Very Hard | mixed |
| Port Lavaca, Texas | 258.5 mg/L | 8.5 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Rockport compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rockport | 369.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Rockport's Water Unique?
Local geology and source profile
Rockport, Texas, in Aransas County — the Aransas County seat adjacent to Fulton and Aransas Pass on the Texas Gulf Coast south of Corpus Christi — receives its water from the City of Rockport Water Department, drawing from the Lake Corpus Christi-Mary Rhodes Pipeline and local mixed sources through the south Texas coast distribution.
The extremely hard 369.5 mg/L hardness and very high TDS of 1,098.7 mg/L reflect the Aransas County supply's extreme Gulf Coast evaporitic character — the Eocene Wilcox Group and Quaternary Gulf Coast alluvium are calcareous-saline formations in the south Texas Coastal Plain; the proximity to the Gulf of Mexico and the shallow saline aquifer zones means Rockport's water supply acquires extreme mineral and ion loading from the highly evaporative coastal geology (compare Fulton TX: 365/1082 in Aransas County comparable; Aransas Pass TX: 373/1115 in San Patricio County comparable; Rockport consistent extremely hard from the same Aransas County Gulf Coast supply). The South Texas Gulf Coast supply — Eocene Wilcox Group (calcareous — primary hardness contributor), Quaternary Gulf Coast alluvium (calcareous saline — secondary contributor), and Holocene Texas Coast coastal sediment (saline — TDS contributor).
At 369.5 mg/L with TDS 1,099, Rockport's water is extremely hard — a whole-house water softener is essential. A reverse osmosis system is strongly recommended for drinking due to very high TDS. The PFAS level of 10.9 ppt is very high — a certified filter with PFAS removal is strongly recommended. Review the City of Rockport's annual water quality report.
Geology & Source: Rockport in Aransas County draws from the Rockport Water on the Aransas-Corpus Christi supply (Aransas County, south Texas coast) — the south Texas Gulf Coastal Plain at Aransas County draws from Eocene Wilcox Group (calcareous) and Quaternary Gulf Coast alluvium (calcareous saline) — Texas Aransas County Gulf Coast supply produces extremely hard water at 369.5 mg/L with TDS 1098.7 mg/L.