Safest Drinking Water in South Carolina 2026
South Carolina has 5 public water systems serving 1,436,371 people. The safest system is Greenville Water (2310001) in Greenville with a score of 100/100.
Top 5 Water Systems in South Carolina
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Greenville Water (2310001) | Greenville | 396,265 | Surface water | 0 | A (100) |
| 2 | Charleston Water System (sc1010001) | Charleston | 327,422 | Surface water | 0 | A (100) |
| 3 | Gsw&sa (sc2620004) | Conway | 247,550 | Surface water | 0 | A (100) |
| 4 | Columbia City of (sc4010001) | Columbia | 319,500 | Surface water | 3 | F (38) |
| 5 | Bjw&sa (0720003) | Okatie | 145,634 | Surface water | 4 | F (16) |
Water quality data for South Carolina is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Greenville Water (2310001) in Greenville has the highest Water Safety Score in South Carolina at 100/100 (Grade A), serving 396,265 people.
South Carolina has 5 public water systems serving 1,436,371 people. The average Water Safety Score is 71/100.
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.