Water Hardness in Lodi, CA

Q: Do I need a water softener in Lodi, CA?

At a citywide weighted average of 111 PPM, Lodi has relatively soft water. A water softener is generally not necessary.

Q: How many water systems serve Lodi, CA?

Lodi, California has 12 matched water systems across 2 zip codes.

California · 2 zip codes · 12 matched water systems

40 PPM

2.3 GPG

Soft

0Soft60120180300+

Verified — State Lab Tested

City avg (weighted): 111 PPM

Dataset updated March 9, 202612 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading

City Of Stockton

CA3910012

Water source: surface water

Source year: 2025

Serves: 191,302

USGS environmental estimate: 260 PPM

Source context

How this city reading is built

This city reading is a weighted rollup across 12 matched water systems and 2 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis

6 verified treated-water sources

12 matched systems total for this city; 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 in Lodi

These systems are matched to Lodi, CA. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.

12 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.

Water System	Source	Hardness	Pop. Served	Data Source
City Of Stockton CA3910012	surface water	40 PPM Soft USGS estimate: 260 PPM	191,302	Verified — State Lab Tested(2025)
California Water Service - Stockton CA3910001	surface water	67 PPM Slightly Hard USGS estimate: 192 PPM	176,266	Verified — State Lab Tested(2024)
Tracy, City Of CA3910011	surface water	63 PPM Slightly Hard USGS estimate: 320 PPM	96,609	Verified — State Lab Tested(2024)
Manteca, City Of CA3910005	surface water	320 PPM Very Hard	84,928	High Confidence — USGS Monitoring
Lodi, City Of CA3910004	surface water	14 PPM Soft USGS estimate: 194 PPM	68,272	Verified — State Lab Tested(2024)

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.

Zip Codes in Lodi, CA

95240111 95242111

What This Means For You

Recommendations are based on the displayed 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 Lodi, CA.

Submit Your Data

Frequently Asked Questions

How hard is the water in Lodi, CA?

The citywide weighted average water hardness in Lodi, CA is 111 PPM (6.5 GPG), classified as slightly hard. This is based on 12 matched water systems. The gauge highlights City Of Stockton, a verified treated-water system, because individual systems can differ from the citywide average.

Do I need a water softener in Lodi, CA?

At 111 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Lodi, CA 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 Lodi, CA?

Lodi, California is served by 12 matched water systems across 2 zip codes.

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