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Water Hardness in 11570

Rockville Centre, New York · Nassau County

43 PPM
2.5 GPG
Soft
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 25 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 25 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
25 USGS-backed sources
25 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
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
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 11570

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.

25 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.
Liberty Utilities New York - Lynbrook
NY2902835
Soft
32 PPMgroundwater220,000 servedHigh Confidence — USGS Monitoring
Liberty Utilities New York - Merrick
NY2902840
Soft
32 PPMgroundwater135,000 servedHigh Confidence — USGS Monitoring
Wa Of Western Nassau
NY2902830
Soft
58 PPMgroundwater120,000 servedHigh Confidence — USGS Monitoring
Town Of Hempstead Water Department
NY2900000
Soft
32 PPMgroundwater110,000 servedHigh Confidence — USGS Monitoring
Jericho Wd
NY2902831
Soft
32 PPMgroundwater58,000 servedHigh Confidence — USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

115654311563431151043115524311572431151843115504311575431101043115204311580431155743

What This Means For You

Recommendations are based on the displayed ZIP 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 Rockville Centre, NY (11570).

Submit Your Data

Frequently Asked Questions

Is the water hard in Rockville Centre, NY (11570)?

The average water hardness in 11570 is 43 PPM (2.5 GPG), which is classified as soft.

Do I need a water softener in 11570?

At 43 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 11570 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 11570?

Zip code 11570 in Rockville Centre, New York is served by 25 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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