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Water Hardness in 95354

Modesto, California · Stanislaus County

218 PPM
12.8 GPG
Hard
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 13 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 13 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
10 USGS-backed sources
13 matched systems total for this ZIP; 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 Serving 95354

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.

13 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.
Modesto, City Of
CA5010010
Soft
27 PPMsurface water218,771 servedHigh Confidence — USGS Monitoring
Turlock, City Of
CA5010019
Very Hard
417 PPMsurface water72,682 servedHigh Confidence — USGS Monitoring
Ceres, City Of
CA5010028
Very Hard
417 PPMsurface water54,513 servedHigh Confidence — USGS Monitoring
Riverbank, City Of
CA5010018
Hard
223 PPMgroundwater24,834 servedHigh Confidence — USGS Monitoring
Patterson, City Of
CA5010017
Very Hard
779 PPMgroundwater23,304 servedEstimated — Nearby Data
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

953512189535521895350218953572189530722195328224953672219535621895326219953582199536822195382221

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 Modesto, CA (95354).

Submit Your Data

Frequently Asked Questions

Is the water hard in Modesto, CA (95354)?

The average water hardness in 95354 is 218 PPM (12.8 GPG), which is classified as hard.

Do I need a water softener in 95354?

With hardness of 218 PPM, a water softener is recommended for homes in 95354.

Is hard water in 95354 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 95354?

Zip code 95354 in Modesto, California is served by 13 water systems.

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