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Water Hardness in 93928

Jolon, California · Monterey County

248 PPM
14.5 GPG
Hard
0Soft60120180300+
Verified — State Lab Tested

Dataset updated March 9, 2026Matched to 9 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 9 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
1 verified treated-water source
9 matched systems total for this ZIP; treated-water reports are prioritized when available.
Water source profile
Primarily groundwater
Groundwater commonly picks up calcium and magnesium after contact with rock and soil. This profile is weighted by known population served across matched systems.
Data recency
Report years 2024
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 93928

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.

9 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.
Cwsc Salinas
CA2710010
Hard
244 PPMgroundwater123,679 servedVerified — State Lab Tested
Source water: 250 PPM
Cal Am Water Company - Monterey
CA2710004
Hard
207 PPMsurface water92,450 servedHigh Confidence — USGS Monitoring
Alco Water Service
CA2710001
Very Hard
372 PPMgroundwater56,253 servedHigh Confidence — USGS Monitoring
Marina Coast Water District
CA2710017
Hard
240 PPMgroundwater38,377 servedHigh Confidence — USGS Monitoring
Soledad, City Of
CA2710011
Slightly Hard
115 PPMgroundwater19,455 servedHigh Confidence — USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

9392024793927247939302489393224893960244939242489345237393923247

What This Means For You

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

Hard Water - Treatment Recommended

Your water is hard. Scale buildup is likely affecting your plumbing and appliances, reducing their lifespan and efficiency. A water softener is recommended to protect your home.

Recommended Products

Salt-Based Water Softener
Our PickAFWFilters Fleck 5600SXT 48KAlso GreatWhirlpool WHES40E 40KAlso GreatAFWFilters 64K GrainAlso GreatAFWFilters Iron Pro 2 64KAlso GreatSpringWell Filter + Softener Combo
Salt-Free Water Conditioner
Our PickSpringWell Salt-Free Cartridge
Water Hardness Test Kit
Our PickVarify (150 Strips)Also GreatJNW Direct (150 Strips)
Shower Head Filter
Our PickWeddell DuoAlso GreatAquaBliss SF100Also GreatSprite Pure 7-SettingAlso GreatAqua Earth 20-Stage
Water Softener Salt
Our PickMorton Clean & ProtectAlso GreatDiamond Crystal Bright & Soft

Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | 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 Jolon, CA (93928).

Submit Your Data

Frequently Asked Questions

Is the water hard in Jolon, CA (93928)?

The average water hardness in 93928 is 248 PPM (14.5 GPG), which is classified as hard.

Do I need a water softener in 93928?

With hardness of 248 PPM, a water softener is recommended for homes in 93928.

Is hard water in 93928 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 93928?

Zip code 93928 in Jolon, California is served by 9 water systems.

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