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Water Hardness in 95219

Stockton, California · San Joaquin County

112 PPM
6.5 GPG
Slightly Hard
0Soft60120180300+
Verified — State Lab Tested

Dataset updated March 9, 2026Matched to 25 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 25 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis
5 verified treated-water sources
25 matched systems 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 2024-2025
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 95219

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.

25 water systems
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.
City Of Stockton
CA3910012
Soft
40 PPMsurface water191,302 servedVerified — State Lab Tested
Source water: 260 PPM
California Water Service - Stockton
CA3910001
Slightly Hard
67 PPMsurface water176,266 servedVerified — State Lab Tested
Source water: 192 PPM
Tracy, City Of
CA3910011
Slightly Hard
63 PPMsurface water96,609 servedVerified — State Lab Tested
Source water: 320 PPM
Manteca, City Of
CA3910005
Very Hard
320 PPMsurface water84,928 servedHigh Confidence — USGS Monitoring
Lodi, City Of
CA3910004
Soft
14 PPMsurface water68,272 servedVerified — State Lab Tested
Source water: 194 PPM
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

94511105956861119520911195641709524211194561105952071119520611195204111952031119521011194513105

What This Means For You

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

Slightly Hard Water

Your water is slightly hard. You may notice minor spotting on dishes or a slight film on faucets. A water softener is optional but can improve water quality.

Recommended Products

Water Hardness Test Kit
Our PickVarify (150 Strips)Also GreatJNW Direct (150 Strips)
Salt-Free Water Conditioner
Our PickSpringWell Salt-Free Cartridge

Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | How to Test Your 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 Stockton, CA (95219).

Submit Your Data

Frequently Asked Questions

Is the water hard in Stockton, CA (95219)?

The average water hardness in 95219 is 112 PPM (6.5 GPG), which is classified as slightly hard.

Do I need a water softener in 95219?

At 112 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 95219 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 95219?

Zip code 95219 in Stockton, California is served by 25 water systems.

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