Water Hardness in Jamestown, CA

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

At a citywide weighted average of 23 PPM, Jamestown has relatively soft water. A water softener is generally not necessary.

Q: How many water systems serve Jamestown, CA?

Jamestown, California has 7 matched water systems across 1 zip code.

California · 1 zip codes · 7 matched water systems

9 PPM

0.5 GPG

Soft

0Soft60120180300+

Verified — State Lab Tested

City avg (weighted): 23 PPM

Dataset updated March 9, 20267 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading

Tud - Upper Basin Water System

CA5510012

Water source: surface water

Source year: 2025

Serves: 13,280

USGS environmental estimate: 81 PPM

Source context

How this city reading is built

This city reading is a weighted rollup across 7 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis

3 verified treated-water sources

7 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 2023-2025

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 Jamestown

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

7 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
Tud - Upper Basin Water System CA5510012	surface water	9 PPM Soft USGS estimate: 81 PPM	13,280	Verified — State Lab Tested(2025)
Tud - Sonora/Jamestown Water System CA5510001	surface water	16 PPM Soft USGS estimate: 81 PPM	11,054	Verified — State Lab Tested(2025)
Cdcr - Sierra Conservation Center CA5510851	surface water	69 PPM Slightly Hard	3,571	Estimated — Nearby Data
Del Oro Water Company - Strawberry Div. CA5510007	surface water	15 PPM Soft USGS estimate: 81 PPM	1,295	Verified — State Lab Tested(2023)
Rawhide Mutual Water Company CA5500071	groundwater	244 PPM Hard	269	Estimated — Nearby Data

Tud - Upper Basin Water System

CA5510012

Soft

9 PPMsurface water13,280 servedVerified — State Lab Tested

Source water: 81 PPM

Tud - Sonora/Jamestown Water System

CA5510001

Soft

16 PPMsurface water11,054 servedVerified — State Lab Tested

Source water: 81 PPM

Cdcr - Sierra Conservation Center

CA5510851

Slightly Hard

69 PPMsurface water3,571 servedEstimated — Nearby Data

Del Oro Water Company - Strawberry Div.

CA5510007

Soft

15 PPMsurface water1,295 servedVerified — State Lab Tested

Source water: 81 PPM

Rawhide Mutual Water Company

CA5500071

Hard

244 PPMgroundwater269 servedEstimated — Nearby Data

Showing the first 5 systems. Expand to review all matched systems.

Zip Codes in Jamestown, CA

9532723

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 Jamestown, CA.

Submit Your Data

Frequently Asked Questions

How hard is the water in Jamestown, CA?

The citywide weighted average water hardness in Jamestown, CA is 23 PPM (1.3 GPG), classified as soft. This is based on 7 matched water systems. The gauge highlights Tud - Upper Basin Water System, a verified treated-water system, because individual systems can differ from the citywide average.

Do I need a water softener in Jamestown, CA?

At 23 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Jamestown, 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 Jamestown, CA?

Jamestown, California is served by 7 matched water systems across 1 zip code.

Learn More About Your Water

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