# DC Water Systems by My Home Water System

> Published water hardness for Washington, DC, 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, DC Water: Average 139 ppm (8 grains per gallon), range 84-194 ppm (Calendar year 2025). Source: 2026 Drinking Water Quality Report (DC Water), summarizing 2025 water quality test results, https://www.dcwater.com/waterreport
- USGS class, our reading of the published figures: moderately hard to very hard. Classes: https://www.usgs.gov/water-science-school/science/hardness-water
- For most of the year, the Washington Aqueduct uses chloramine to keep DC water disinfected. Source: DC Water 2026 Drinking Water Quality Report, https://www.dcwater.com/waterreport
- DC water comes from the Potomac River, treated by the Washington Aqueduct and bought by DC Water. Source: DC Water 2026 Drinking Water Quality Report, https://www.dcwater.com/waterreport
- For a short time each spring, the Aqueduct switches from chloramine to chlorine only. Source: DC Water 2026 Drinking Water Quality Report, https://www.dcwater.com/waterreport
- Sources last checked: 2026-10-27

## Pages
- [Washington water and quotes](https://dcwatersystems.com/): the answer, the sources, common questions
- [Water data as JSON](https://dcwatersystems.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.