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Water Hardness in 78155

Seguin, Texas · Guadalupe County

238 PPM
13.9 GPG
Hard
0Soft60120180300+
Verified - Annual Water Quality Report

Dataset updated March 9, 2026Matched to 9 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 9 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
9 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
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 78155

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.

9 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.
Green Valley Sud
TX0940020
Hard
239 PPMsurface water52,497 servedHigh Confidence - USGS Monitoring
City Of Schertz
TX0940003
Very Hard
263 PPMgroundwater41,948 servedHigh Confidence - USGS Monitoring
Springs Hill Sud
TX0940022
Very Hard
250 PPMsurface water35,472 servedEstimated - County Avg
City Of Seguin
TX0940002
Very Hard
250 PPMsurface water32,736 servedEstimated - County Avg
Crystal Clear Sud
TX0940015
Moderately Hard
150 PPMsurface water20,766 servedVerified - Annual Water Quality Report
Source water: 208 PPM
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

781232387812423878638238781302707812216781082387812156786612837815230078670238786581678154242

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 Seguin, TX (78155).

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Frequently Asked Questions

Is the water hard in Seguin, TX (78155)?

The average water hardness in 78155 is 238 PPM (13.9 GPG), which is classified as hard.

Do I need a water softener in 78155?

With hardness of 238 PPM, a water softener is recommended for homes in 78155.

Is hard water in 78155 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 78155?

Zip code 78155 in Seguin, Texas is served by 9 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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