Water hardness in San Francisco
ZIP 94102
San Francisco, California water hardness report with local comparison and next-step guidance.
170 PPM means hard water in this ZIP code
Hard water is likely noticeable here, especially on taps, kettles, showers, and heaters.
This ZIP code is about 67 PPM softer than the California average.
Local reading
Water in San Francisco ZIP francisco-94102 is currently recorded at 170 PPM. That is about 9.9 grains per gallon, which is the format many softener buyers use when comparing systems.
Common household impact and typical response
Limescale on heaters and kettles
If scaling is frequent, compare softeners or maintenance habits before replacing appliances.
Dry skin and soap performance
Hard water can make skin feel tighter and reduce lather. A full-home treatment setup is not always the first step.
What this reading usually means (C)
Hard-water profile. Treatment decisions should prioritize scale control and heater efficiency.
Data quality: Eligible for indexing
Nearby ZIP codes to compare in California
Compare nearby areas to see whether this reading is unusual for the state or fairly typical nearby.
Keep comparing before you buy
A local reading is only the first step. Compare the state page and a few practical guides before deciding whether treatment is worth the money.