All water systems in Maryland
3,216 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Winfield Elementary Carroll County |
700 | 0 | 0 | |
|
Rolling Acres St. Mary's County |
699 | 1 | 0 | |
|
ST Michaels Catholic Church Howard County |
697 | 2 | 1 | |
|
Prospect Mill Elementary Harford County |
691 | 0 | 0 | |
|
Mount Aetna Washington County |
688 | 0 | 0 | |
|
Calvert Middle School Prince Frederick · Calvert County |
675 | 1 | 1 | |
|
Martingham Utilities Cooperative Talbot County |
675 | 0 | 0 | |
|
Town of Chesapeake City [formerly South] Cecil County |
673 | 0 | 0 | |
|
Piney Point St. Mary's County |
672 | 1 | 0 | |
|
Glenwood Library Howard County |
671 | 0 | 0 | |
|
Catoctin Mountain Nat. Park-Misty Mount Frederick County |
668 | 0 | 0 | |
|
Folly Quarter Middle School Howard County |
667 | 1 | 0 | |
|
Mount Savage School Cumberland · Allegany County |
665 | 0 | 0 | |
|
Piney Point Elementary School St. Mary's County |
665 | 0 | 0 | |
|
Davidsonville Elementary Anne Arundel County |
650 | 0 | 0 | |
|
East Coast Fuel, LLC Wicomico County |
650 | 0 | 0 | |
|
Lettie Marshall Dent Elementary St. Mary's County |
650 | 0 | 0 | |
|
Sandymount Elementary Carroll County |
650 | 0 | 0 | |
|
Forest Hill Elementary School Harford County |
637 | 1 | 0 | |
|
Patuxent Elementary School Calvert County |
637 | 0 | 0 | |
|
Bayshore Campground Kent County |
636 | 1 | 0 | |
|
Town of Millington Kent County |
630 | 2 | 0 | |
|
Chesapeake Christian Fellowship Anne Arundel County |
625 | 1 | 0 | |
|
Town of Sharptown Wicomico County |
625 | 1 | 0 | |
|
Frontiertown Community Ctr + SW Sites Worcester County |
624 | 0 | 0 | |
|
Kemptown Elementary Frederick County |
623 | 0 | 0 | |
|
Town of Friendsville Garrett County |
622 | 1 | 0 | |
|
Frontiertown Lazy River Bathhouse Worcester County |
620 | 0 | 0 | |
|
St. Clements Shores St. Mary's County |
620 | 1 | 0 | |
|
Frontiertown Bathhouse # 1 Worcester County |
618 | 0 | 0 | |
|
Frontiertown Bathhouse # 3 Worcester County |
618 | 0 | 0 | |
|
Jacksonville Elementary Baltimore County |
618 | 0 | 0 | |
|
Charlotte Hall St. Mary's County |
615 | 1 | 0 | |
|
Plum Point Elementary School Calvert County |
615 | 0 | 0 | |
|
The Shoppes at Waysons Corner Anne Arundel County |
615 | 0 | 0 | |
|
Town Center Amoco Calvert County |
615 | 0 | 0 | |
|
Hunters Brooke/falcon Ridge Subd Charles County |
614 | 2 | 0 | |
|
Immaculate Conception Roman Cath Chur St. Mary's County |
614 | 0 | 0 | |
|
Fallston Library Harford County |
610 | 0 | 0 | |
|
Huntingtown Elementary School Calvert County |
609 | 0 | 0 | |
|
Shore Stop #219 Worcester County |
609 | 1 | 0 | |
|
T.c. Martin Elementary School Charles County |
609 | 0 | 0 | |
|
Holy Family Cath. Church Anne Arundel County |
607 | 0 | 0 | |
|
Mardela Goose Creek INC Wicomico County |
607 | 0 | 0 | |
|
Camp Louise Washington County |
606 | 0 | 0 | |
|
Dash in Owings Calvert County |
606 | 0 | 0 | |
|
Jefferson Market Frederick County |
606 | 0 | 0 | |
|
Elk Neck Elementary Cecil County |
605 | 1 | 0 | |
|
Highs #1 Whiteford Harford County |
605 | 1 | 0 | |
|
U5 Foods Bethlehem Caroline County |
604 | 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.