Jerome Water Hardness & Quality Report (2026)
Water Hardness
3.9 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
131.2 mg/L
Est. Daily Cost
$0.18
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 Jerome, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Jerome | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.4 yrs | 8.5 yrs | -13% |
| Washing Machine | 11.1 yrs | 12 yrs | -8% |
| Water Heater | 12.9 yrs | 15 yrs | -14% |
Regional Water Comparison
How Jerome compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Jerome, Idaho | 67 mg/L | 1.6 ppt | 🟡 Moderately Hard | reservoir |
| Twin Falls, Idaho | 106.5 mg/L | 2.2 ppt | 🟡 Moderately Hard | reservoir |
| Burley, Idaho | 98 mg/L | 2.1 ppt | 🟡 Moderately Hard | reservoir |
| Mountain Home, Idaho | 40 mg/L | 1.2 ppt | 🟢 Soft | reservoir |
| Boise, Idaho | 53.5 mg/L | 1.4 ppt | 🟢 Soft | reservoir |
National Benchmark
How Jerome compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Jerome | 67 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Jerome's Water Unique?
Local geology and source profile
Jerome, Idaho, in Jerome County — the Jerome County seat adjacent to Twin Falls and Burley in the Snake River Plain of south-central Idaho — receives its water from the City of Jerome Water Department, drawing from the Snake River Plain Aquifer through the south-central Idaho distribution.
The soft 67 mg/L hardness and TDS of 131.2 mg/L reflect the Jerome County Snake River Plain Aquifer supply's soft basaltic character — the Miocene Columbia River Basalt is highly insoluble volcanic basalt contributing minimal dissolved minerals to the Snake River Plain groundwater, while Quaternary Snake River alluvium contributes modest calcareous mineral content from its slightly calcareous alluvial sediments (compare Twin Falls ID: 65/126 in Twin Falls County comparable; Burley ID: 68/136 in Cassia County comparable; Jerome consistent soft from the same Jerome County Snake River Plain Miocene basaltic supply). The Snake River Plain Aquifer — Miocene Columbia River Basalt (insoluble — primary dilutant), Quaternary Snake River alluvium (slightly calcareous — primary hardness contributor), and Quaternary Snake River Plain lacustrine sediment (slightly calcareous — minor TDS).
At 67 mg/L with TDS 131, Jerome's water is soft — minimal scale buildup. Annual descaling is appropriate. The PFAS level of 1.6 ppt is very low — an excellent result for south-central Idaho. Review the City of Jerome's annual water quality report.
Geology & Source: Jerome in Jerome County draws from the Jerome Water on the Snake River Plain aquifer (Jerome County, south-central Idaho) — the Snake River Plain at Jerome County draws from Miocene Columbia River Basalt (insoluble) and Quaternary Snake River alluvium (slightly calcareous) — Idaho Jerome County Snake River Plain Miocene basaltic supply produces soft water at 67 mg/L with TDS 131.2 mg/L.