Chatsworth Water Hardness & Quality Report (2026)
Water Hardness
4.1 grains per gallon
Source
mixed
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
161.2 mg/L
Est. Daily Cost
$0.19
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 Chatsworth, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Chatsworth | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 12.8 yrs | 15 yrs | -15% |
Regional Water Comparison
How Chatsworth compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Chatsworth, California | 70.5 mg/L | 3.9 ppt | 🟡 Moderately Hard | mixed |
| Winnetka, California | 185 mg/L | 7.3 ppt | 🔴 Very Hard | mixed |
| Canoga Park, California | 98.5 mg/L | 4.8 ppt | 🟡 Moderately Hard | mixed |
| Northridge, California | 112 mg/L | 5.1 ppt | 🟡 Moderately Hard | mixed |
| West Hills, California | 88.5 mg/L | 4.5 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Chatsworth compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Chatsworth | 70.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Chatsworth's Water Unique?
Local geology and source profile
Chatsworth, California, a neighborhood of Los Angeles in the far northwest San Fernando Valley — a major Santa Susana Mountains foothill community known as the 'Rock Climbing Capital of Los Angeles' (Stoney Point Park), historically the location of the adult film industry's 'Porn Valley' (Chatsworth was a center of adult film production in the 1990s–2000s), adjacent to the Chatsworth Reservoir and the Chatsworth Nature Preserve, and a diverse northwest Los Angeles community at the edge of the Santa Susana Mountains — draws its municipal water supply from the MWD blend via the LADWP. Water hardness in Chatsworth measures 70.5 mg/L — classified as moderately soft.
Chatsworth's moderate softness — among the softer San Fernando Valley neighborhoods — reflects the LADWP's effective treatment in the northwest San Fernando Valley Chatsworth distribution zone. The LADWP MWD blend (Colorado River and State Water Project) is treated at LADWP facilities, and the Chatsworth distribution zone (served by the west San Fernando Valley LADWP district) has relatively effective treatment and somewhat newer northwest valley infrastructure compared to central valley zones. The effective LADWP treatment in the Chatsworth zone produces the soft 70.5 mg/L.
With hardness at 70.5 mg/L, Chatsworth residents enjoy soft water for a San Fernando Valley community. LADWP consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from the Metropolitan Water District (MWD) Colorado River and State Water Project (SWP) blend via the Los Angeles Department of Water and Power (LADWP) — the Los Angeles County Chatsworth northwest San Fernando Valley (Chatsworth Formation calcareous-moderate Cretaceous Chatsworth Formation sandstone and MWD blend, effective LADWP treatment); moderately soft supply at 70.5 mg/L — reflecting effective northwest San Fernando Valley treatment in the Chatsworth zone.