Public Water Systems
3,215 active public water systems in MD, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.
| System Name | Location | Population | Violations | PFAS |
| Ava Wanas Montessori School | Sykesville, MD | 45 | 32 | - |
| Carrollton Church of God | Finksburg, MD | 45 | 2 | - |
| Faith Community Bible Church | Fork, MD | 45 | 1 | - |
| Emmanuel Baust Ucc | Westminster, MD | 45 | 10 | - |
| All Smiles Dental Care | Westminster, MD | 45 | 0 | - |
| North East Quarry | North East, MD | 45 | 35 | - |
| Victorious Kids / Master's Child Church | Indian Head, MD | 45 | 30 | - |
| Marbury Church of God | Marbury, MD | 45 | 52 | - |
| Lifestream Church of Nazarene | Waldorf, MD | 45 | 2 | - |
| Countryside Christian Church | Cambridge, MD | 45 | 90 | - |
| Miss Loretta's Early Learning Center | Keymar, MD | 45 | 1 | - |
| Beckleys Camping Center | Thurmont, MD | 45 | 22 | - |
| Green Valley Animal Hospital | Ljamsville, MD | 45 | 0 | - |
| New Market Grange #362 | Monrovia, MD | 45 | 6 | - |
| Sod Run Wastewater Treatment Plant | Bel Air, MD | 45 | 52 | - |
| S.h.a. - Churchville Maintenance Shop | Millersville, MD | 45 | 1 | - |
| Trinity Freewill Baptist Church | Darlington, MD | 45 | 4 | - |
| 31850 Millington Road | Millington, MD | 45 | 3 | - |
| Placid Harbor and Iam Educ Center | Hollywood, MD | 45 | 0 | - |
| Seabreeze Restaurant | Mechanicsville, MD | 45 | 0 | - |
| Smoke House BBQ | Mechanicsville, MD | 45 | 0 | - |
| Ag Center -Co-Op Extension Office | MD | 45 | 19 | - |
| Christian Community Child Care Center | Salisbury, MD | 45 | 18 | - |
| Island Resort Campground | Newark, MD | 45 | 9 | - |
| Silver Oak Academy | Keymar, MD | 44 | 11 | - |
| Relax Inn | MD | 44 | 16 | - |
| Swann Haven Mobile Home Park | Chester, MD | 44 | 280 | - |
| Calvary Temple | Gambrills, MD | 44 | 0 | - |
| Our Lady of Grace Church | Parkton, MD | 44 | 96 | - |
| Fairview Um Church | Phoenix, MD | 44 | 1 | - |
| Dejon Vineyard | Hydes, MD | 44 | 3 | - |
| Ship's Point Business Park LLC | Lusby, MD | 44 | 4 | - |
| Winfield Medical Center | Sykesville, MD | 44 | 4 | - |
| Red Run Condos | McHenry, MD | 44 | 3 | - |
| Fast Eddies Pit Beef | Fallston, MD | 44 | 5 | - |
| Willow Springs Golf Course | Catonsville, MD | 44 | 13 | - |
| Bureau of Highways Cooksville | Ellicott City, MD | 44 | 2 | - |
| Eastman Specialties Corporation | Kingsport, MD | 44 | 37 | - |
| Ridge Rider - Well A | Witchita Kansas, MD | 43 | 12 | - |
| Little Orleans Grocery/ Bills Place | Little Orleans, MD | 43 | 24 | - |
| Kids Farm Childcare - Davidsonville | Davidsonville, MD | 43 | 76 | - |
| The Picantillo | Pasadena, MD | 43 | 13 | - |
| Park Inn Inc | Westminster, MD | 43 | 1 | - |
| Dough Run ( Formerly Monkton Grille) | Odenton, MD | 43 | 2 | - |
| Fairview A.m.e. Church | Forest Hill, MD | 43 | 6 | - |
| Fort Frederick State Park - Picnic Area | Big Pool, MD | 43 | 2 | - |
| Oldtown Volunteer Fire Department | Oldtown, MD | 42 | 3 | - |
| Gingerville Community Pool | Edgewater, MD | 42 | 5 | - |
| Shady Side Soft Serve | Shady Side, MD | 42 | 8 | - |
| Wooddell and Passaro Dental | Davidsonville, MD | 42 | 1 | - |