Grand Terrace Water Hardness & Quality Report (2026)
Water Hardness
11.5 grains per gallon
Source
mixed
pH Level
8.4
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
627.2 mg/L
Est. Daily Cost
$0.52
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 Grand Terrace, your appliances are currently losing 26% efficiency due to mineral buildup.
| Appliance | In Grand Terrace | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.1 yrs | 8.5 yrs | -64% |
| Washing Machine | 6.3 yrs | 12 yrs | -48% |
| Water Heater | 7.7 yrs | 15 yrs | -49% |
Regional Water Comparison
How Grand Terrace compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Grand Terrace, California | 196.5 mg/L | 7.6 ppt | 🔴 Very Hard | mixed |
| Colton, California | 82 mg/L | 4.2 ppt | 🟡 Moderately Hard | mixed |
| Loma Linda, California | 115.5 mg/L | 5.2 ppt | 🟡 Moderately Hard | mixed |
| San Bernardino, California | 166 mg/L | 6.7 ppt | 🟠 Hard | mixed |
| Bloomington, California | 142 mg/L | 6 ppt | 🟠 Hard | mixed |
National Benchmark
How Grand Terrace compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Grand Terrace | 196.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Grand Terrace home
Shop water softeners on Amazon.com →
What Makes Grand Terrace's Water Unique?
Local geology and source profile
Grand Terrace, California, in San Bernardino County — a San Bernardino County city adjacent to Colton and Loma Linda in the Inland Empire in California — receives its water from the Riverside Highland Water, drawing from the San Bernardino basin or State Water Project (San Bernardino County) through the Inland Empire distribution.
The hard 196.5 mg/L hardness and TDS of 627.2 mg/L reflect the Inland Empire San Bernardino County supply's hard calcareous character — the Cretaceous San Bernardino Mountains granodiorite and Pleistocene Colton Formation produce hard water compounded by the semi-arid Inland Empire evaporative concentration (compare Pedley CA: 227/771 in Riverside County harder on the Colorado River draw; Grand Terrace softer from more local San Bernardino basin). The San Bernardino basin at Grand Terrace — Cretaceous granodiorite (slightly calcareous — primary hardness contributor), Pleistocene Colton Formation (calcareous — secondary contributor), and desert evaporative concentration (calcareous — TDS contributor).
At 196.5 mg/L with TDS 627, Grand Terrace's water is hard. A water softener is recommended to prevent scale buildup. A reverse osmosis system is advisable for drinking water. The PFAS level of 7.6 ppt warrants a certified drinking water filter — the San Bernardino County Inland Empire military and industrial corridor contribute to Grand Terrace's elevated readings.
Geology & Source: Grand Terrace in San Bernardino County draws from the Riverside Highland Water on the San Bernardino basin (San Bernardino County, Inland Empire, California) — the San Bernardino basin at Grand Terrace is developed in Cretaceous San Bernardino Mountains granodiorite (slightly calcareous) and Pleistocene Colton Formation (calcareous) — California San Bernardino County Inland Empire Cretaceous-Pleistocene supply produces hard water at 196.5 mg/L with TDS 627.2 mg/L.