Windsor Water Hardness & Quality Report (2026)
Water Hardness
10.2 grains per gallon
Source
mixed
pH Level
8.2
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
535.5 mg/L
Est. Daily Cost
$0.46
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 Windsor, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Windsor | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.9 yrs | 8.5 yrs | -54% |
| Washing Machine | 7.2 yrs | 12 yrs | -40% |
| Water Heater | 8.6 yrs | 15 yrs | -43% |
Regional Water Comparison
How Windsor compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Windsor, California | 174 mg/L | 7.1 ppt | 🟠 Hard | mixed |
| Santa Rosa, California | 95.5 mg/L | 4.8 ppt | 🟡 Moderately Hard | mixed |
| Rohnert Park, California | 123.5 mg/L | 5.6 ppt | 🟠 Hard | mixed |
| Petaluma, California | 48.5 mg/L | 3.4 ppt | 🟢 Soft | mixed |
| Agua Caliente, California | 29 mg/L | 2.9 ppt | 🟢 Soft | mixed |
National Benchmark
How Windsor compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Windsor | 174 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Windsor's Water Unique?
Local geology and source profile
Windsor, California, in Sonoma County — a major north Bay Area Sonoma County wine country community (Windsor is a significant Sonoma County town — a north Bay Area suburban and wine country community adjacent to Healdsburg and Santa Rosa; Windsor is situated in the heart of the Russian River Valley and Dry Creek Valley wine regions, two of the most important American Viticultural Areas for Pinot Noir and Zinfandel in California; Windsor has grown significantly as a bedroom community for Santa Rosa and the broader Sonoma County wine country corridor), home of a significant wine industry workforce, a diverse Sonoma County community with a significant Hispanic-American (particularly Mexican-American) agricultural and wine industry worker population and a growing professional and wine country lifestyle population, adjacent to Santa Rosa and Healdsburg in the north Sonoma County corridor, home of the Sonoma County Airport (Charles M. Schulz–Sonoma County Airport), and a north Bay Area community shaped by its wine country location — draws its municipal water supply via the Town of Windsor Water Division (Sonoma Water). Water hardness in Windsor measures 174 mg/L — classified as hard.
Windsor's hard supply reflects the north Bay Area Sonoma County Russian River watershed supply's calcareous-moderate character. The Russian River at Windsor–Sonoma County drains the Franciscan Complex greywacke (calcareous-poor). Sonoma Water treatment with distribution variation produces the hard 174 mg/L.
At 174 mg/L, Windsor residents face regular hard water challenges. Monthly descaling and water softeners are recommended. Town of Windsor Water Division consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from the Russian River watershed via the Town of Windsor Water Division (Sonoma Water) — the Sonoma County north Bay Area Windsor corridor (Franciscan Complex calcareous-poor greywacke — the calcareous-poor north Bay Area Sonoma County Russian River watershed; effective treatment); hard supply at 174 mg/L in Sonoma County.