WH

Water Hardness in 92251

Imperial, California · Imperial County

310 PPM
18.1 GPG
Very Hard
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
1 verified treated-water source
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 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 92251

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.
El Centro, City Of
CA1310004
Very Hard
388 PPMsurface water43,772 servedEstimated - Nearby Data
Calexico, City Of
CA1310002
Very Hard
388 PPMsurface water40,357 servedEstimated - Nearby Data
Brawley, City Of
CA1310001
Very Hard
285 PPMsurface water26,862 servedHigh Confidence - USGS Monitoring
Imperial, City Of
CA1310006
Slightly Hard
87 PPMsurface water21,591 servedEstimated - Nearby Data
Calipatria State Prison
CA1310800
Slightly Hard
87 PPMsurface water4,800 servedEstimated - Nearby Data
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

9227331592243320922813189223131892259317922493219222731892233318922753189193427292004272

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 Imperial, CA (92251).

Submit Your Data

Frequently Asked Questions

Is the water hard in Imperial, CA (92251)?

The average water hardness in 92251 is 310 PPM (18.1 GPG), which is classified as very hard.

Do I need a water softener in 92251?

With hardness of 310 PPM, a water softener is recommended for homes in 92251.

Is hard water in 92251 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 92251?

Zip code 92251 in Imperial, California is served by 8 water systems.

Learn More About Your Water

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

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

Well Water Hardness: Why It's Usually Hard & How to Treat It

Well water is almost always harder than city water. Learn why, how to test your well, and the best treatment options for hard well water.

8 min read