# Madison Water Systems by My Home Water System

> Published water hardness for Madison, WI, 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
- Hardness, citywide, Madison Water Utility: 18-20 grains per gallon (Undated FAQ). Source: Madison Water Utility: Water Quality Frequently Asked Questions, https://www.cityofmadison.com/water/water-quality/faq
- Hardness, Unit Well 6, Madison Water Utility: 450 mg/L (26 grains per gallon) (Calendar year 2025). Source: Unit Well #6 water quality report, https://www.cityofmadison.com/water/documents/water-quality/Well06QualityReport.pdf
- Hardness, Unit Well 14, Madison Water Utility: 580 mg/L (34 grains per gallon) (Calendar year 2025). Source: Unit Well #14 water quality report, https://www.cityofmadison.com/water/documents/water-quality/Well14QualityReport.pdf
- USGS class, our reading of the published figures: very hard. Classes: https://www.usgs.gov/water-science-school/science/hardness-water
- Hardness differs from well to well. The 22 well reports we read give 270 to 580 mg/L, and nine of them are harder than the citywide FAQ figure.
- Madison Water Utility disinfects with chlorine and says it does not use chloramine. Source: Madison Water Utility water quality FAQ, https://www.cityofmadison.com/water/water-quality/faq
- Madison water is all groundwater, pumped by 21 active wells from a deep sandstone aquifer under the city. Source: Madison Water Utility water quality report, https://www.cityofmadison.com/water/documents/water-quality/WaterQualityEnglish.pdf
- Each Madison well serves its own part of town, and the utility publishes a separate quality report for each well, so water differs by neighborhood. Source: Madison Water Utility water quality report, https://www.cityofmadison.com/water/documents/water-quality/WaterQualityEnglish.pdf
- Sources last checked: 2026-10-27

## Pages
- [Madison water and quotes](https://madisonwatersystems.com/): the answer, the sources, common questions
- [Water data as JSON](https://madisonwatersystems.com/water.json)
- [Madison water by well](https://madisonwatersystems.com/by-area/): where each area or utility serves, its own figures and treatment
- [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.