# St. Louis Water Systems by My Home Water System

> Published water hardness for St. Louis, MO, copied from the utility's own reports, and a way to request a written water treatment quote from one local company. Not a water utility.

## Water facts, as published
- Total hardness, City of St. Louis Water Division: Average 129 ppm, range 80-206 ppm (Calendar year 2025). Source: ST. LOUIS CITY WATER - A HISTORY OF EXCELLENCE (2025 Consumer Confidence Report), https://www.stlwater.com/ccr.pdf
- USGS class, our reading of the published figures: moderately hard to very hard. Classes: https://www.usgs.gov/water-science-school/science/hardness-water
- The St. Louis report lists chloramine as a treatment additive, at 1.67 to 3.46 ppm in 2025. Source: St. Louis Water Division Consumer Confidence Report, https://www.stlwater.com/ccr.pdf
- The Chain of Rocks plant draws from the Mississippi River and the Howard Bend plant from the Missouri River. Source: St. Louis Water Division Consumer Confidence Report, https://www.stlwater.com/ccr.pdf
- Yes. The city report lists precipitative softening as part of treatment. Source: St. Louis Water Division Consumer Confidence Report, https://www.stlwater.com/ccr.pdf
- Sources last checked: 2026-10-27

## Pages
- [St. Louis water and quotes](https://stlouiswatersystems.com/): the answer, the sources, common questions
- [Water data as JSON](https://stlouiswatersystems.com/water.json)
- [Water softeners](https://www.myhomewatersystem.com/water-softeners/), [whole-home filtration](https://www.myhomewatersystem.com/whole-home-filtration/), [reverse osmosis](https://www.myhomewatersystem.com/reverse-osmosis/)
- [Hard water by city](https://www.myhomewatersystem.com/hard-water-by-city/): published hardness for every city we cover

## Status
- Not taking requests yet. No prices are published; quotes come after an assessment at the home.
- Run by My Home Water System, operated by Aidren LLC.