Northern Mariana Islands Soil Drainage Rankings
How well does the soil drain across Northern Mariana Islands? We ranked every USDA survey area by the percentage of land classified as "well drained." Areas at the top of the list have soils where water moves through at a healthy rate — favorable for building, septic, and gardening. Areas at the bottom have more waterlogged or slowly-draining soils that may require engineered solutions.
The best-drained survey area is Islands of Aguijan, Rota, Saipan and Tinian, Commonwealth of the Northern Mariana Islands at 94% well-drained soils. The most drainage-challenged is Islands of Agrigan, Alamagan, Anatahan, Pagan, and Sarigan, Commonwealth of the Northern Mariana Islands at 80%.
| # | Survey Area | Well Drained | Poorly Drained | Dominant Class |
|---|---|---|---|---|
| 1 | Islands of Aguijan, Rota, Saipan and Tinian, Commonwealth of the Northern Mariana Islands | 94% | 1% | Well drained |
| 2 | Islands of Agrigan, Alamagan, Anatahan, Pagan, and Sarigan, Commonwealth of the Northern Mariana Islands | 80% | 0% | Well drained |