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Primary water source for Community Water Systems by size (2010)
| Size of CWS (based on population served) | SW | GW | GWU | Unknown | Total |
|---|---|---|---|---|---|
| Very small (< 500) | 1262 | 13,595 | 178 | 212 | 15,247 |
| Small (501 to 3300) | 1329 | 4,322 | 101 | 120 | 5872 |
| Medium (3301 to 10,000) | 803 | 1219 | 27 | 99 | 2148 |
| Large (10,001 to 100,000) | 922 | 833 | 21 | 202 | 1978 |
| Very large (> 100,000) | 126 | 54 | 3 | 75 | 258 |
| Total | 4,442 | 20,023 | 330 | 710 | 25,503 |
SW surface water; GW groundwater; GWU groundwater under the influence of surface water
