All water systems in Maryland
3,216 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Riva Trace Baptist Church Anne Arundel County |
815 | 1 | 0 | |
|
Mountaindale Convenience Store # 2 Frederick County |
812 | 0 | 0 | |
|
Royal Farm Store #1 Harford County |
812 | 0 | 0 | |
|
Maryland Manor Mobile Home Park Anne Arundel County |
810 | 0 | 0 | |
|
Royal Farms Store #32 Anne Arundel County |
809 | 0 | 0 | |
|
Dunkin Donuts Anne Arundel County |
808 | 0 | 0 | |
|
Calvert County Fairground Calvert County |
807 | 0 | 0 | |
|
Royal Farms #62 Carroll County |
806 | 0 | 0 | |
|
Seven Eleven # 21067 Charlotte Hall St. Mary's County |
805 | 0 | 0 | |
|
Point Lookout State Park North St. Mary's County |
803 | 0 | 0 | |
|
Stethem ED Cntr & James Craik Elementary Charles County |
801 | 0 | 0 | |
|
Dollar General (no. 14630) Anne Arundel County |
800 | 0 | 0 | |
|
Hoopers Restaurant Worcester County |
800 | 0 | 0 | |
|
Seven-Eleven Hampstead Carroll County |
800 | 0 | 0 | |
|
St. Marys Bryantown Catholic School Charles County |
791 | 0 | 0 | |
|
Swallow Falls State Park Garrett County |
791 | 0 | 0 | |
|
Cedarville Mobile Home Park Prince George's County |
780 | 0 | 0 | |
|
Mary Miller LLC Frederick County |
780 | 0 | 0 | |
|
Fairmount Somerset County |
750 | 0 | 0 | |
|
Lyons Creek Estates Anne Arundel County |
750 | 0 | 0 | |
|
Salisbury Christian School Wicomico County |
750 | 0 | 0 | |
|
Town of Preston Caroline County |
750 | 1 | 0 | |
|
Southern Middle School Calvert County |
745 | 0 | 0 | |
|
Cliffton on the Potomac Charles County |
744 | 2 | 0 | |
|
Mardela Middle/high School Wicomico County |
735 | 1 | 0 | |
|
McDonalds of Lisbon Howard County |
735 | 0 | 0 | |
|
Hagerstown Speedway Washington County |
732 | 0 | 0 | |
|
St. John the Evangelist Catholic School Baltimore County |
730 | 4 | 0 | |
|
Rising Sun Elementary Cecil County |
726 | 0 | 0 | |
|
Town of Oxford Talbot County |
726 | 1 | 0 | |
|
Buttonwood Beach RV Resort Cecil County |
725 | 0 | 0 | |
|
Fairlee Kent County |
725 | 1 | 0 | |
|
Glenstone Museum Montgomery County |
725 | 0 | 0 | |
|
Port Deposit Cecil County |
725 | 0 | 0 | |
|
Piccowaxen Middle School Charles County |
722 | 0 | 0 | |
|
Runway Liquors Talbot County |
720 | 0 | 0 | |
|
Dunkin Gambrills Anne Arundel County |
718 | 0 | 0 | |
|
Hunting Quarters St. Mary's County |
715 | 1 | 0 | |
|
Savory Deli and Market Harford County |
714 | 0 | 0 | |
|
Harford Community College Harford County |
713 | 2 | 0 | |
|
Lower Shore Tourism Center Worcester County |
713 | 0 | 0 | |
|
Royal Farms Store #56 Anne Arundel County |
708 | 0 | 0 | |
|
Mt. Harmony Elementary School Calvert County |
706 | 0 | 0 | |
|
Town of Queenstown Queen Anne's County |
705 | 4 | 0 | |
|
Harriet Elizabeth Brown Community Center Calvert County |
700 | 0 | 0 | |
|
Jiffy Mart Finksburg Carroll County |
700 | 0 | 0 | |
|
Northrop Grumman Systems Corporation Cecil County |
700 | 1 | 0 | |
|
Patapsco State Park ( McKeldin A) Carroll County |
700 | 0 | 0 | |
|
Rodney Scout Camp Cecil County |
700 | 1 | 0 | |
|
Runnymede Elementary Carroll County |
700 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules currently in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Maryland records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.