# Boston Water Systems by My Home Water System

> Published water hardness for Boston, MA, 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
- Typical total hardness, MWRA (for Boston Water and Sewer Commission): Approximately 16 mg/L, or 1 grain per gallon (Undated web page). Source: Frequently Asked Questions About Drinking Water (MWRA), https://www.mwra.com/your-water-system/drinking-water-quality/frequently-asked-questions-about-mwra-tap-water
- Total hardness, monthly reading, MWRA (for Boston Water and Sewer Commission): 14.3 mg/L at the Carroll Water Treatment Plant (July 2026 sampling). Source: Water Quality Update: An Analysis of July 2026 Sampling Data (MWRA), https://www.mwra.com/media/file/wq-update-072026
- USGS class, our reading of the published figures: soft. Classes: https://www.usgs.gov/water-science-school/science/hardness-water
- The MWRA's July 2026 update describes hardness as about 15 to 20 mg/L, or about 1 grain per gallon.
- MWRA, which supplies Boston, disinfects with monochloramine, a compound of chlorine and ammonia. Source: MWRA 2025 Annual Water Quality Test Results, https://www.mwra.com/node/8620
- Boston water comes from MWRA's Quabbin and Wachusett reservoirs in central Massachusetts and is delivered by the Boston Water and Sewer Commission. Source: MWRA 2025 Annual Water Quality Test Results, https://www.mwra.com/node/8620
- MWRA says a chlorine smell is more likely in summer, when water is warmer, and that algae in its reservoirs can cause an earthy taste in spring and fall. Source: MWRA tap water FAQ, https://www.mwra.com/your-water-system/drinking-water-quality/frequently-asked-questions-about-mwra-tap-water
- Sources last checked: 2026-10-27

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