Water hardness in Rockport
10.5 gpg hard
Tap water in Rockport is hard: 10.5 gpg (179 mg/L · 10 °dH · 17.9 °fH).
Source: City of Rockport 2023 Annual Drinking Water Quality Report (2023) · data checked 2026-11-03
Range across supply zones: 136–244 mg/L.
The City of Rockport's 2023 water quality report lists hardness as CaCO3 at an average of 179 ppm (10.5 gpg). Results ran from 136 to 244 ppm (8.0 to 14.3 gpg), so the water is hard to very hard depending on the sample. The report does not break the figure down by area. Expect scale on water heaters and fixtures; a softener is worth considering.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 10.5 gpg |
|---|---|
| Utility | City of Rockport (Water Storage and Distribution) |
How Rockport compares
- Tap water in Rockport is 15 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 603 of 1372 in the United States (1 = hardest); 56 % of these cities have softer water.
- In Texas it is number 23 of 60 cities; the regional median is 8.6 gpg.
- Nearest city with clearly harder water: Corpus Christi, 42 km away (13.8 gpg).
Ranking of the hardest and softest water in the United States →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Rockport
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Rockport water hard or soft?
It is hard: 179 mg/L as CaCO₃ (10.5 gpg, 10 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rockport safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
How many grains per gallon is Rockport water?
10.5 gpg, equal to 10 °dH, 17.9 °fH or 179 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rockport?
For 179 mg/L (10 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Rockport?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: City of Rockport 2023 Annual Drinking Water Quality Report (2023). Method: figure published by the water supplier. City of Rockport 2023 Annual Drinking Water Quality Report · Outdated figure? Tell us