| <all other values> |
| Adkins Race 1 |
| Alder Branch 1 |
| Andover Branch 2 |
| Andover Branch UT 1 |
| Bald Hill Branch 1 |
| Basin Run 1 |
| Bear Creek 2 |
| Beaver Run 1 |
| Beaverdam Creek 2 |
| Big Elk Creek 2 |
| Big Hunting Creek 1 |
| Big Run UT 1 |
| Blackrock Run 1 |
| Blinkhorn Creek 1 |
| Blockston Branch UT 1 |
| Broad Creek 1 |
| Browns Branch 3 |
| Buffalo Run 1 |
| Bynum Run UT 1 |
| Carrolls Branch 1 |
| Casselman River 1 |
| Chaptico Run 1 |
| Choptank River UT 1 |
| Cooks Branch 2 |
| Crabtree Creek 1 |
| Cypress Branch 2 |
| Davis Millpond Branch 1 |
| Deer Creek 7 |
| Deer Creek UT 2 |
| Delaware Run 1 |
| Dividing Creek 1 |
| Dry Run 1 |
| E Fork Langford Creek UT 1 |
| Elklick Run 1 |
| Faulkner Branch 1 |
| Fifteenmile Creek 3 |
| First Mine Branch 1 |
| Forge Branch 1 |
| Forrest Hall Branch 1 |
| Gillis Falls 2 |
| Goshen Run UT 1 |
| Granny Finley Branch 1 |
| Gravel Run 1 |
| Gunpowder Falls 1 |
| Hayden Run 1 |
| Herring Run 1 Caroline Co |
| High Run 1 |
| Highfield Creek 1 |
| Hill Top Fork UT 1 |
| Hillton Run 1 |
| Hog Creek 1 |
| Hoghole Run 1 |
| Hollands Branch 1 |
| Hoyes Run 1 |
| Hunting Creek 1 |
| Island Creek 1 |
| Jadwins Creek 1 |
| Jennie Run 1 |
| Joe Branch 1 |
| Johns Creek 1 |
| Keysers Run 1 |
| Kings Creek 1 |
| Laurel Run UT 1 |
| Little Burnt Branch 1 |
| Little Falls 1 |
| Little Gunpowder Falls 4 |
| Little Mill Creek 1 |
| Little Morgan Run 2 |
| Little North East Creek 1 |
| Lyons Creek 3 |
| Marsh Creek 1 |
| Mataponi Creek UT 1 |
| Mattawoman Creek 1 |
| Mattawoman Creek UT 1 |
| Mattawoman Creek UT 2 |
| Mattawoman Creek UT 3 |
| McIntosh Run 2 |
| Middle Fork Crabtree Creek 1 |
| Middle Run 1 |
| Mill Creek 1 Cecil Co |
| Mill Run 2 Garrett Co |
| Mill Run 3 Charles Co |
| Mill Stream Branch 1 |
| Monroe Run 1 |
| Morgan Run 1 |
| Morgan Run UT 1 |
| Murphy Run 1 |
| N Branch Patapsco River 1 |
| N Branch Patapsco River UT 1 |
| N Branch Patapsco River UT 2 |
| Nanjemoy Creek 1 |
| Nassawango Creek 3 |
| Norwich Creek 2 |
| Old Womans Run 1 |
| Otter Point Creek 1 |
| Patuxent River 1 |
| Peggys Run 1 |
| Piney Branch 2 Carroll Co |
| Piscataway Creek 2 |
| Plum Creek 1 |
| Potomac River UT 1 |
| Potomac River UT 2 |
| Principio Creek 3 |
| Puzzley Run 1 |
| Red Lion Branch 1 |
| Red Run 1 |
| Reeder Run 2 |
| Robins Creek 1 |
| Rock Creek 1 |
| S Branch Bear Creek 1 |
| S Branch Patapsco River 1 |
| S Branch Patapsco River UT 1 |
| Saint Clements Bay UT 1 |
| Saint Clements Creek 1 |
| Saint Marys River 1 |
| Savage River 2 |
| Sideling Hill Creek 1 |
| Skinners Run 1 |
| Skipton Creek UT 1 |
| Smoots Pond Run 1 |
| Southeast Creek 2 |
| Sullivan Branch 1 |
| Swanson Creek 2 |
| Talbot Branch UT 1 |
| Three Bridges Branch 1 |
| Town Creek 1 |
| Tuckahoe River 1 |
| Tull Branch 1 |
| Turkey Branch 1 |
| Wards Run 2 |
| Warehouse Run 1 |
| Watts Creek 1 |
| Weldon Creek 1 |
| Wye East River UT 1 |
| Youghiogheny River UT 1 |
| Zekiah Swamp Run 5 |
| Aquia aquifer |
| Arundel Clay confining unit |
| Basement |
| Calvert aquifer system |
| Calvert confining unit |
| Choptank aquifer |
| Lower Chesapeake confining unit |
| Lower Patapsco aquifer |
| Magothy aquifer |
| Magothy-Patapsco confining unit |
| Manokin aquifer |
| Marlboro Clay confining unit |
| Matawan aquifer |
| Matawan confining unit |
| Matawan-Magothy confining unit |
| Monmouth aquifer |
| Nanjemoy confining unit |
| Ocean City aquifer |
| Patapsco confining unit |
| Patuxent aquifer |
| Piney Point aquifer |
| Pocomoke aquifer |
| Severn confining unit |
| St. Mary's confining unit |
| Surficial Upland aquifer base |
| Surficial aquifer base |
| Upper Chesapeake confining unit 1 |
| Upper Chesapeake confining unit 2 |
| Upper Chesapeake confining unit 3 |
| Upper Patapsco aquifer |
| Waste Gate aquifer |
