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Water Hardness in 34990

Palm City, Florida · Martin County

343 PPM
20.1 GPG
Very Hard
0Soft60120180300+
High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 6 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 6 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
4 USGS-backed sources
6 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 34990

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.

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.
Martin Co Utilities
FL4431891
Very Hard
351 PPMgroundwater104,105 servedEstimated - County Avg
South Martin Regional Utilities
FL4430624
Very Hard
351 PPMgroundwater27,000 servedEstimated - County Avg
Stuart, City Of - Water Plant
FL4430259
Very Hard
292 PPMgroundwater16,841 servedHigh Confidence - USGS Monitoring
Harbour Ridge
FL4565002
Very Hard
292 PPMgroundwater1,573 servedHigh Confidence - USGS Monitoring
Golden Hills Mhp
FL6424623
Very Hard
292 PPMgroundwater323 servedHigh Confidence - USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

349943433495320034984200349563423499734434996343349573433495220034987200349832003345534434986200

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 Palm City, FL (34990).

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Frequently Asked Questions

Is the water hard in Palm City, FL (34990)?

The average water hardness in 34990 is 343 PPM (20.1 GPG), which is classified as very hard.

Do I need a water softener in 34990?

With hardness of 343 PPM, a water softener is recommended for homes in 34990.

Is hard water in 34990 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 34990?

Zip code 34990 in Palm City, Florida is served by 6 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.

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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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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.

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