Riverbank Water Hardness & Quality Report (2026)
Water Hardness
4.6 grains per gallon
Source
mixed
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
188.5 mg/L
Est. Daily Cost
$0.21
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 Riverbank, your appliances are currently losing 11% efficiency due to mineral buildup.
| Appliance | In Riverbank | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7 yrs | 8.5 yrs | -18% |
| Washing Machine | 10.7 yrs | 12 yrs | -11% |
| Water Heater | 12.4 yrs | 15 yrs | -17% |
Regional Water Comparison
How Riverbank compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Riverbank, California | 79.5 mg/L | 4.3 ppt | 🟡 Moderately Hard | mixed |
| Oakdale, California | 142 mg/L | 6.1 ppt | 🟠 Hard | mixed |
| Modesto, California | 177.5 mg/L | 7.1 ppt | 🟠 Hard | mixed |
| Ceres, California | 42 mg/L | 3.2 ppt | 🟢 Soft | mixed |
| Salida, California | 134.5 mg/L | 5.9 ppt | 🟠 Hard | mixed |
National Benchmark
How Riverbank compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Riverbank | 79.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Riverbank's Water Unique?
Local geology and source profile
Riverbank, California, in Stanislaus County on the Stanislaus River in the northern San Joaquin Valley near Modesto — home to a historic downtown and once a significant Army ammunition depot site — receives its municipal water from the City of Riverbank Utilities Department, drawing from the Stanislaus River through a surface water intake and supplementary local groundwater wells in the Stanislaus County alluvium. The Stanislaus River flows westward from the Sierra Nevada foothills through New Melones Reservoir before entering the San Joaquin Valley floor, where Riverbank's intake collects water enriched by Sierra snowmelt.
The moderately soft 79.5 mg/L hardness and TDS of 188.5 mg/L reflect the Stanislaus River's Sierra Nevada origin. New Melones Reservoir collects water from the Stanislaus River headwaters draining granitic and metamorphic terrain of the central Sierra Nevada — ancient Precambrian and Mesozoic crystalline rocks (Tuolumne Batholith granodiorite, metamorphic schist and amphibolite) with minimal carbonate content. Sierra snowmelt traveling through these hard rock terrains picks up very little calcium or magnesium, producing characteristically soft reservoir water. The local San Joaquin Valley alluvial groundwater component adds modest mineral content, resulting in a moderately soft finished supply.
At 79.5 mg/L, Riverbank's water is moderately soft — comfortable for everyday household use in this Central Valley community. Soap lathers well, appliances scale slowly over many months, and the dishwasher produces clean glassware with minimal rinse aid. Semi-annual descaling of kettles and coffee machines is adequate for this softness level. The low PFAS level of 4.3 ppt is favorable for a Stanislaus County community — the Riverbank Army Ammunition Plant site has undergone environmental remediation, and current PFAS levels in Riverbank's supply remain below regional averages.
Geology & Source: Riverbank in Stanislaus County draws from the Stanislaus River and local San Joaquin Valley groundwater — the Stanislaus originates in the Sierra Nevada through New Melones Reservoir, carrying relatively soft Sierra snowmelt water — Sierra granitic and metamorphic watershed character blended with Central Valley alluvial groundwater produces moderately soft water at 79.5 mg/L.