WH

Water Hardness in Mariposa, CA

California · 1 zip codes · 6 matched water systems

25 PPM
1.5 GPG
Soft
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 20266 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

Source context

How this city reading is built

This city reading is a weighted rollup across 6 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis
6 USGS-backed sources
6 matched systems total for this city; USGS monitoring is used where treated-water reports are unavailable.
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
March 9, 2026
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 Mariposa

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

6 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.
Mariposa Public Utility Dist
CA2210001
Soft
25 PPMsurface water2,000 servedHigh Confidence — USGS Monitoring
Ponderosa Basin Mutual Wtr Co
CA2210002
Soft
25 PPMgroundwater798 servedHigh Confidence — USGS Monitoring
Yosemite West Water System
CA2210924
Soft
25 PPMgroundwater420 servedHigh Confidence — USGS Monitoring
Mariposa Pines Mutual
CA2210906
Soft
25 PPMgroundwater284 servedHigh Confidence — USGS Monitoring
Mpwd-Coulterville Csa 1
CA2210901
Soft
25 PPMgroundwater193 servedHigh Confidence — USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Zip Codes in Mariposa, CA

9533825

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 Mariposa, CA.

Submit Your Data

Frequently Asked Questions

How hard is the water in Mariposa, CA?

The citywide weighted average water hardness in Mariposa, CA is 25 PPM (1.5 GPG), classified as soft. This is based on 6 matched water systems.

Do I need a water softener in Mariposa, CA?

At 25 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Mariposa, 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 Mariposa, CA?

Mariposa, California is served by 6 matched water systems across 1 zip code.

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.

10 min read

How to Test Water Hardness at Home

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

8 min read