All water systems in Maryland
3,216 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Sunderland Elementary School Calvert County |
481 | 0 | 0 | |
|
Town of Betterton Kent County |
481 | 0 | 0 | |
|
Town of Cecilton Cecil County |
477 | 2 | 1 | |
|
Lothian Elementary Anne Arundel County |
476 | 0 | 0 | |
|
Oakville Elementary School St. Mary's County |
475 | 0 | 0 | |
|
B.t.r. Hampstead (black and Decker) Carroll County |
472 | 1 | 0 | |
|
Darnestown Swim and Raquet Club Montgomery County |
470 | 0 | 0 | |
|
Huntingtown Professional Center, LLC Calvert County |
470 | 2 | 0 | |
|
Glen Meadows Retirement Community Baltimore County |
468 | 2 | 0 | |
|
Liberty Elementary Frederick County |
466 | 0 | 0 | |
|
Henson Boy Scout Reservation Dorchester County |
465 | 0 | 0 | |
|
North Harford Elementary Harford County |
464 | 2 | 0 | |
|
Patuxent Presbyterian Church St. Mary's County |
464 | 0 | 0 | |
|
The Calverton School Calvert County |
461 | 3 | 0 | |
|
Misty Meadows 1 / Highland Hills M.h.p. Cecil County |
460 | 0 | 0 | |
|
Prettyboy Elementary School Baltimore County |
460 | 0 | 0 | |
|
St. Ignatius of Loyola Catholic Church Frederick County |
455 | 0 | 0 | |
|
Town of Clear Spring Washington County |
455 | 1 | 0 | |
|
7-Eleven Thurmont#28960 Frederick County |
450 | 0 | 0 | |
|
Bar T Mountainside Frederick County |
450 | 1 | 1 | |
|
Christian Life Center Frederick County |
450 | 0 | 0 | |
|
Dollar General #13896 Cecil County |
450 | 1 | 0 | |
|
Dynard Elementary School St. Mary's County |
450 | 0 | 0 | |
|
Echo Hill Camp Kent County |
450 | 0 | 0 | |
|
Gaither Manor Apartments Carroll County |
450 | 1 | 0 | |
|
Patuxent Mobile Estates Anne Arundel County |
450 | 0 | 0 | |
|
Southern Calvert Baptist Church Calvert County |
450 | 1 | 0 | |
|
St. Andrews School Anne Arundel County |
450 | 1 | 0 | |
|
Worcester Technical HS & CO Boe Office Worcester County |
450 | 1 | 0 | |
|
Malcolm Elementary School Charles County |
446 | 0 | 0 | |
|
Southern Maryland Christian Academy Charles County |
445 | 1 | 0 | |
|
Churchville Elementary School Harford County |
441 | 1 | 0 | |
|
Chapel District Elementary Talbot County |
440 | 1 | 0 | |
|
The Barnesville School Montgomery County |
440 | 1 | 0 | |
|
Harbor View Cecil County |
437 | 0 | 0 | |
|
Seventh District Elementary Baltimore County |
437 | 0 | 0 | |
|
Mount Airy Christian Academy Howard County |
435 | 0 | 0 | |
|
Cross Point Subdivision Calvert County |
434 | 0 | 0 | |
|
Echo Hill Outdoor School Kent County |
434 | 0 | 0 | |
|
Frontiertown Theme Park Worcester County |
430 | 0 | 0 | |
|
Queen Annes Rest Stop 301 Queen Anne's County |
430 | 0 | 0 | |
|
Rockbridge Academy Anne Arundel County |
425 | 0 | 0 | |
|
South Carroll Swim Club Carroll County |
425 | 0 | 0 | |
|
The Valley Inn Baltimore County |
425 | 0 | 0 | |
|
Yellowfin Steak and Fish House Anne Arundel County |
425 | 0 | 0 | |
|
Camp Puhtok for Boys and Girls Baltimore County |
420 | 0 | 0 | |
|
Sunnybrook Baltimore County |
416 | 1 | 0 | |
|
Circle D Farm Club House Howard County |
415 | 0 | 0 | |
|
Elkridge Estates of Roland Park Baltimore County |
414 | 0 | 0 | |
|
Metropolitan of Baltimore Baltimore city County |
414 | 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.