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Water Hardness in 95383

Twain Harte, California · Tuolumne County

21 PPM
1.2 GPG
Soft
0Soft60120180300+
Verified - State Lab Tested

Dataset updated March 9, 2026Matched to 8 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 8 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
3 verified treated-water sources
8 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 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 Serving 95383

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.

8 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.
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
Twain Harte Community Services District
CA5510005
Slightly Hard
81 PPMsurface water2,378 servedHigh Confidence - USGS Monitoring
Del Oro Water Company - Strawberry Div.
CA5510007
Soft
15 PPMsurface water1,295 servedVerified - State Lab Tested
Source water: 81 PPM
Sierra Village Mutual Water Co
CA5500074
Slightly Hard
81 PPMgroundwater361 servedHigh Confidence - USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

953462095372139533512953101395379139523319953701995224199524757952511995221199524619

What This Means For You

Use this ZIP reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.

MethodologyData sourcesHow 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 Twain Harte, CA (95383).

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Frequently Asked Questions

Is the water hard in Twain Harte, CA (95383)?

The average water hardness in 95383 is 21 PPM (1.2 GPG), which is classified as soft.

Do I need a water softener in 95383?

At 21 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 95383 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 95383?

Zip code 95383 in Twain Harte, California is served by 8 water systems.

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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