Safest Drinking Water in Massachusetts 2026
Massachusetts has 5 public water systems serving 1,283,333 people. The safest system is Worcester Dpwp, Water Supply Division in Worcester with a score of 97/100.
Top 5 Water Systems in Massachusetts
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Worcester Dpwp, Water Supply Division | Worcester | 206,518 | Surface water | 0 | A (97) |
| 2 | Cambridge Water Department | Cambridge | 118,214 | Surface water | 0 | A (91) |
| 3 | Boston Water and Sewer Commission (mwra) | Boston | 675,647 | Surface water | 1 | B (87) |
| 4 | Lowell Regional Water Utility | Lowell | 115,000 | Surface water | 3 | F (55) |
| 5 | Springfield Water and Sewer Commission | Springfield | 167,954 | Surface water | 27 | F (40) |
Water quality data for Massachusetts is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Worcester Dpwp, Water Supply Division in Worcester has the highest Water Safety Score in Massachusetts at 97/100 (Grade A), serving 206,518 people.
Massachusetts has 5 public water systems serving 1,283,333 people. The average Water Safety Score is 74/100.
The Water Safety Score (0-100) is based on health violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring violations (10%). Higher scores mean cleaner, safer water.
Water Safety Score: health violations (40%), contaminant exceedances (30%), enforcement history (20%), monitoring violations (10%).
The this entity category groups every U.S. public drinking-water safety entity sharing this attribute. The list above is the data; the paragraphs below explain what the grouping means against the broader the EPA Safe Drinking Water Information System (SDWIS) distribution and how to read the relative rankings within the category.
For readers using this category as a starting point, the per-entity detail pages linked from the table above carry the underlying the EPA Safe Drinking Water Information System (SDWIS) data in full. The category-level view is the filter; the per-entity pages are the actual answer.
Source: EPA Ground Water and Drinking Water, 2026.