We found 29 public water systems that could serve the same population as Test Area No 3 (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Huntsville Utilities | Huntsville | 219,168 | 90 | 0 |
| Madison County Water Department | Huntsville | 85,947 | 76 | 1 |
| Madison Water Works & Sewer | Madison | 39,051 | 62 | 29 |
| Harvest-monrovia Water System | Harvest | 32,109 | 63 | 1 |
| Us Army Aviation & Missile Command | Redstone Arsenal | 28,500 | 71 | 53 |
| Owens Crossroads Water Authority | County of Madison | 7,161 | 0 | 8 |
| New Hope Water System | New Hope | 5,544 | 0 | 3 |
| Triana Water Works | Triana | 2,412 | 0 | 12 |
| Gurley Water System | Gurley | 1,113 | 0 | 10 |
| Big Cove Water & Fire Prot Aut | County of Madison | 885 | 0 | 0 |
| Buckhorn High | County of Madison | 530 | 0 | 0 |
| Crestwood Estates Water Service | Madison | 339 | 0 | 0 |
| Myricks Motel | County of Madison | 225 | 0 | 0 |
| Murphy Plaza Inc. | County of Madison | 200 | 0 | 0 |
| Mountain View Trailer Court | County of Madison | 147 | 0 | 0 |
| Mountain View Restaurant | County of Madison | 130 | 0 | 0 |
| Shady Brook Mhp | County of Madison | 120 | 0 | 0 |
| Mountain Lake Resort Sd | Gurley | 102 | 0 | 0 |
| Karen Trailer Court | County of Madison | 90 | 0 | 0 |
| Town & Country Mobile Village | County of Madison | 90 | 0 | 0 |
| Rustic Acres Trailer Court | County of Madison | 39 | 0 | 0 |
| Bentley Subdivision Water Sym | County of Madison | 36 | 0 | 0 |
| Morning Star Day Care | County of Madison | 34 | 0 | 0 |
| Hillcrest Motor Court | County of Madison | 32 | 0 | 0 |
| Redstone Arsenal Visitor Center | County of Madison | 32 | 0 | 0 |
| Aqua-mate Pure Water System | County of Madison | 32 | 0 | 0 |
| Colonial Grand At Research Park | County of Madison | 32 | 0 | 0 |
| Colonial Grand At Edgewater | County of Madison | 32 | 0 | 0 |
| Colonial Grand At Madison | County of Madison | 32 | 0 | 0 |