Safest Drinking Water in Indiana 2026
Indiana has 5 public water systems serving 1,658,293 people. The safest system is Indiana American Water - Northwest in Greenwood with a score of 100/100.
Top 5 Water Systems in Indiana
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Indiana American Water - Northwest | Greenwood | 210,510 | Surface water | 0 | A (100) |
| 2 | South Bend Water Works | South Bend | 115,000 | Ground water | 0 | A (100) |
| 3 | Evansville Water Utility | Evansville | 182,444 | Surface water | 0 | A (94) |
| 4 | Citizens Water - Indianapolis | Indianapolis | 880,345 | Surface water | 0 | B (87) |
| 5 | Fort Wayne - 3 Rivers Filtration Plant | Fort Wayne | 269,994 | Surface water | 3 | F (50) |
Water quality data for Indiana is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Indiana American Water - Northwest in Greenwood has the highest Water Safety Score in Indiana at 100/100 (Grade A), serving 210,510 people.
Indiana has 5 public water systems serving 1,658,293 people. The average Water Safety Score is 86/100.
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.