Water Hardness in 78666
San Marcos, Texas · Hays County
Based on treated water data from the utility's Consumer Confidence Report (CCR) — the annual water quality report your provider is required to publish.
Our Estimate
Weighted average from 12 water systems.
What This Means For You
Moderately Hard Water
Your water is moderately hard. You're likely seeing scale buildup on fixtures, spotty dishes, and may notice dry skin or hair. A water softener or conditioner can help.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | How 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 San Marcos, TX (78666).
Water Systems Serving 78666
Nearby Zip Codes
Frequently Asked Questions
Is the water hard in San Marcos, TX (78666)?
The average water hardness in 78666 is 150 PPM (8.8 GPG), which is classified as moderately hard.
Do I need a water softener in 78666?
With hardness of 150 PPM, a water softener is worth considering for homes in 78666.
How many water systems serve 78666?
Zip code 78666 in San Marcos, Texas is served by 12 water systems.
Learn More About Your Water
Do You Need a Water Softener? (Based on Your Water Hardness)
A data-driven guide to help you decide if a water softener is worth the investment based on your actual water hardness level.
10 min readSalt-Based vs Salt-Free Water Softener: Which Do You Need?
Salt-based softeners remove hardness minerals. Salt-free conditioners prevent scale but don't soften. Here's how to choose based on your water hardness level.
10 min readBest Shower Filters for Hard Water (2026 Reviews)
We tested KDF, Vitamin C, and carbon shower filters for hard water. Here are the filters that actually reduce mineral buildup on hair and skin.
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