Atwater Water Hardness & Quality Report (2026)
Water Hardness
2 grains per gallon
Source
mixed
pH Level
7.2
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
68.1 mg/L
Est. Daily Cost
$0.09
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 Atwater, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In Atwater | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.5 yrs | 8.5 yrs | — |
| Washing Machine | 12.4 yrs | 12 yrs | — |
| Water Heater | 14.3 yrs | 15 yrs | -5% |
Regional Water Comparison
How Atwater compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Atwater, California | 33.5 mg/L | 2.9 ppt | 🟢 Soft | mixed |
| Livingston, California | 94 mg/L | 4.7 ppt | 🟡 Moderately Hard | mixed |
| Merced, California | 73 mg/L | 4.1 ppt | 🟡 Moderately Hard | mixed |
| Turlock, California | 124 mg/L | 5.6 ppt | 🟠 Hard | mixed |
| Los Banos, California | 159.5 mg/L | 6.6 ppt | 🟠 Hard | mixed |
National Benchmark
How Atwater compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Atwater | 33.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Atwater's Water Unique?
Local geology and source profile
Atwater, California, in Merced County — a major central California San Joaquin Valley city (Atwater is a significant Merced County city — a central California Valley community adjacent to Castle Air Force Base (the former Castle AFB was decommissioned in 1995 and converted to Castle Airport — now home of the Castle Air Museum (one of the most significant aviation history museums in the United States — the Castle Air Museum has a remarkable collection of Cold War-era bombers and military aircraft, including several aircraft that cannot be found anywhere else)); Atwater is primarily an agricultural service community in the heart of the Merced County San Joaquin Valley), a diverse Merced County community with a significant Hispanic-American (particularly Mexican-American), Hmong-American, and working-class agricultural population, adjacent to Merced in the Merced County agricultural corridor, and a community defined by its Central Valley agricultural landscape — draws its municipal water supply from the San Joaquin Valley groundwater via the City of Atwater Water Division. Water hardness in Atwater measures 33.5 mg/L — classified as very soft.
Atwater's very soft supply reflects the Merced County central California San Joaquin Valley Sierra Nevada alluvial fan aquifer's calcareous-poor character. The San Joaquin Valley aquifer at Atwater draws from the Quaternary calcareous-poor Sierran alluvial fan deposits (calcareous-poor granitic alluvium). City of Atwater treatment produces the very soft 33.5 mg/L.
With hardness at 33.5 mg/L, Atwater residents enjoy very soft water. City of Atwater Water Division consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the San Joaquin Valley Basin (Merced Irrigation District) via the City of Atwater Water Division — the Merced County central California San Joaquin Valley Atwater corridor (Quaternary calcareous-poor Sierra Nevada granite alluvium and Pleistocene calcareous-poor Modesto Formation — the calcareous-poor central California San Joaquin Valley Sierra Nevada alluvial fan; effective treatment); very soft supply at 33.5 mg/L in Merced County.