Table of Contents

1. Austin's Water Source: The Colorado River and Limestone Story

2. Understanding Austin's 4.9 GPG Hardness \u2014 and Why It's Remarkable

3. How Austin Compares to Every Other Major Texas City

4. The PFAS Problem: What 8.4 ppt Means for Austin Families

5. UCMR5 Explained: Why Austin Is Being Tested for New Contaminants

6. Beyond Hardness and PFAS: The Full Contaminant Picture

7. Do You Actually Need a Water Softener in Austin?

8. When Austin Homeowners DO Need Water Treatment

9. New Construction and Austin's Growth: Hidden Water Quality Issues

10. The Best Water Treatment Companies Serving Austin

11. How to Read Your Austin Water Quality Report

12. Protecting Your Home: System Recommendations by Situation

13. Frequently Asked Questions

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Austin's Water Source: The Colorado River and Limestone Story

Austin's drinking water comes primarily from surface water sources \u2014 specifically, the Colorado River of Texas and its associated Highland Lakes system, including Lake Travis and Lake Austin. Austin Water, the city's municipal utility, operates three water treatment plants: the Ullrich Water Treatment Plant, the Davis Water Treatment Plant, and the Handcox Water Treatment Plant. Together, these facilities have a combined treatment capacity of approximately 335 million gallons per day (MGD), serving more than 1.1 million customers across Austin and surrounding contract areas.

The geology matters here. The Colorado River flows through the Texas Hill Country, a region dominated by Cretaceous-era limestone and dolomite formations that make up the Edwards Plateau. As river water passes over and through these formations, it picks up dissolved calcium and magnesium \u2014 the minerals responsible for water hardness. But here's what makes Austin different from cities like San Antonio and the DFW suburbs: Austin pulls its water from surface sources (rivers and lakes) rather than deep groundwater wells that have prolonged contact...