# Baltimore Water Systems by My Home Water System

> Published water hardness for Baltimore, MD, 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, annual average of monthly results, Baltimore City DPW (Montebello laboratory): 114 mg/L (monthly range 109-120) (Calendar year 2022). Source: Montebello Water Quality Laboratory Mineral Analyses 2022, https://publicworks.baltimorecity.gov/files/min-anal-2022pdf
- Hardness, annual average of monthly results, Baltimore City DPW (Ashburton laboratory): 80 (monthly range 76-84; the form prints no unit) (Calendar year 2022). Source: Ashburton Water Quality Laboratory Mineral Analyses 2022, https://publicworks.baltimorecity.gov/files/min-anal-2022-ashburton-labpdf
- USGS class, our reading of the published figures: moderately hard. Classes: https://www.usgs.gov/water-science-school/science/hardness-water
- The city's 2023, 2024 and 2025 water quality reports list no hardness figure, and we found no mineral analyses newer than 2022.
- The scale on this page uses the Montebello figures only, because the Ashburton form does not print a unit.
- Baltimore lists chlorine as the additive that disinfects its supply. Source: Baltimore City 2025 Water Quality Report, https://s3.amazonaws.com/baltimorecity.gov.if-us-east-1/s3fs-public/2026-07/2025%20Baltimore%20City%20Water%20Quality%20Report.pdf
- Baltimore water is rain and snowmelt stored in the Liberty, Loch Raven and Prettyboy reservoirs and treated at the Ashburton and Montebello plants. The Susquehanna River is used only in severe drought. Source: Baltimore City 2025 Water Quality Report, https://s3.amazonaws.com/baltimorecity.gov.if-us-east-1/s3fs-public/2026-07/2025%20Baltimore%20City%20Water%20Quality%20Report.pdf
- Sources last checked: 2026-10-27

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