Where does the water in 94132 come from?

Water for zip code 94132 in San Francisco, California is provided by 1 water system. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 94132

San Francisco, California · San Francisco County

9 PPM

0.5 GPG

Soft

0Soft60120180300+

Verified — State Lab Tested

Dataset updated March 9, 2026Matched to 1 water systemTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 1 matched water system. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis

1 verified treated-water source

1 matched system total for this ZIP; treated-water reports are prioritized when available.

Water source profile

Primarily surface water

Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.

Data recency

Report years 2024

Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 94132

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

1 water system

PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.

Water System	Source	Hardness	Pop. Served	Data Source
Sfpuc City Distribution Division CA3810011	surface water	9 PPM Soft USGS estimate: 208 PPM	848,019	Verified — State Lab Tested(2024)

Sfpuc City Distribution Division

CA3810011

Soft

9 PPMsurface water848,019 servedVerified — State Lab Tested

Source water: 208 PPM

Nearby Zip Codes

941169 941279 941129 941229 941319 94015241 94014241 941149 941349 941179 941219 941109

What This Means For You

Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Your Water Is Soft

Your water hardness is in the soft range. You likely don't need a water softener. Enjoy your naturally soft water!

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for San Francisco, CA (94132).

Submit Your Data

Frequently Asked Questions

Is the water hard in San Francisco, CA (94132)?

The average water hardness in 94132 is 9 PPM (0.5 GPG), which is classified as soft.

Do I need a water softener in 94132?

At 9 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 94132 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 94132?

Zip code 94132 in San Francisco, California is served by 1 water system.

Learn More About Your Water

Water Hardness Scale: PPM and GPG Chart

Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.

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How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

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