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Water Hardness in 78648

Luling, Texas · Caldwell County

283 PPM
16.5 GPG
Very Hard
0Soft60120180300+
High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 4 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 4 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
3 USGS-backed sources
4 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 78648

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.

4 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.
City Of Lockhart
TX0280001
Very Hard
283 PPMsurface water18,800 servedHigh Confidence - USGS Monitoring
City Of Luling
TX0280002
Very Hard
283 PPMsurface water7,364 servedHigh Confidence - USGS Monitoring
Maxwell Sud
TX0280003
Very Hard
283 PPMsurface water5,823 servedEstimated - County Avg
Warm Springs Rehab Hospital
TX0890005
Very Hard
283 PPMgroundwater166 servedHigh Confidence - USGS Monitoring

Nearby Zip Codes

78661283786581678638238786321678622283786702387864428378655283786162827812216786562837895940

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 Luling, TX (78648).

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Frequently Asked Questions

Is the water hard in Luling, TX (78648)?

The average water hardness in 78648 is 283 PPM (16.5 GPG), which is classified as very hard.

Do I need a water softener in 78648?

With hardness of 283 PPM, a water softener is recommended for homes in 78648.

Is hard water in 78648 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 78648?

Zip code 78648 in Luling, Texas is served by 4 water systems.

Learn More About Your Water

How to Test Water Hardness at Home

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Water Hardness Scale: PPM and GPG Chart

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

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