All water systems in Maryland
3,216 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
MD American Water Greenridge Harford County |
2,351 | 0 | 0 | |
|
Herald Harbor Anne Arundel County |
2,241 | 0 | 0 | |
|
Saint Marys College St. Mary's County |
2,200 | 1 | 0 | |
|
Town of Rising Sun Cecil County |
2,200 | 1 | 0 | |
|
Town of Westernport Allegany County |
2,200 | 4 | 1 | |
|
Mountain Hill Water Company Cecil County |
2,154 | 0 | 0 | |
|
Town of Hurlock Dorchester County |
2,150 | 1 | 0 | |
|
Mountain Christian Church Harford County |
2,120 | 0 | 0 | |
|
Adventist Healthcare Shady Grove Med Ctr Montgomery County |
2,100 | 0 | 0 | |
|
Johns Hopkins University Baltimore city County |
2,058 | 0 | 0 | |
|
Chesapeake Church Calvert County |
2,050 | 0 | 0 | |
|
Beaches Water Co-Operative Calvert County |
2,000 | 0 | 0 | |
|
Friendsville I-68 Rest Area Restroom Garrett County |
2,000 | 0 | 0 | |
|
I-70 Rest Areas (eastside and Westside) Frederick County |
2,000 | 0 | 0 | |
|
Johns Hopkins Hospital Baltimore city County |
2,000 | 0 | 0 | |
|
Perry Point V.a. Medical Center Cecil County |
2,000 | 0 | 0 | |
|
Town of Myersville Frederick County |
2,000 | 0 | 0 | |
|
Town of Hancock Washington County |
1,921 | 2 | 0 | |
|
Highs Dairy Store Talbot County |
1,909 | 0 | 0 | |
|
Suburban Hospital Montgomery County |
1,900 | 0 | 0 | |
|
Town of Greensboro Caroline County |
1,878 | 1 | 0 | |
|
Town of Oakland Garrett County |
1,850 | 1 | 0 | |
|
Chopticon High School St. Mary's County |
1,845 | 0 | 0 | |
|
Wawa Foods #559 Harford County |
1,823 | 0 | 0 | |
|
Fire and Rescue Center Somerset County |
1,800 | 0 | 0 | |
|
Goose Creek and Westover Food Mart Somerset County |
1,800 | 0 | 0 | |
|
Potomac Heights Charles County |
1,800 | 0 | 0 | |
|
Leonardtown High School St. Mary's County |
1,750 | 0 | 0 | |
|
Town of Rock Hall Kent County |
1,750 | 1 | 1 | |
|
Town of New Windsor Carroll County |
1,732 | 1 | 0 | |
|
Linganore High School Frederick County |
1,722 | 0 | 0 | |
|
Fort Smallwood Park Anne Arundel County |
1,646 | 0 | 0 | |
|
Sideling Hill State Park Exhibit RT 68 W Washington County |
1,603 | 0 | 0 | |
|
Town of Ridgely Caroline County |
1,600 | 0 | 0 | |
|
Lakeside Village Washington County |
1,575 | 1 | 0 | |
|
Knolls of Windsor Frederick County |
1,553 | 0 | 0 | |
|
Castaways Campground Worcester County |
1,550 | 0 | 0 | |
|
Huntingtown High School Calvert County |
1,540 | 0 | 0 | |
|
Glenelg High School Howard County |
1,532 | 1 | 0 | |
|
Wawa #573 Calvert County |
1,516 | 0 | 0 | |
|
UM Saint Joseph Medical Center Baltimore County |
1,515 | 0 | 0 | |
|
Royal Farms #135 Caroline County |
1,512 | 0 | 0 | |
|
Waterside Frederick County |
1,509 | 0 | 0 | |
|
7-Eleven Prince Frederick Calvert County |
1,500 | 0 | 0 | |
|
Bushy Park Es/glenwood MS Complex Howard County |
1,500 | 0 | 0 | |
|
Deep Creek Lake State Park (day Use) Garrett County |
1,500 | 0 | 0 | |
|
N. Dorchester Middle & High Schools Dorchester County |
1,500 | 1 | 0 | |
|
Springfield Hospital Distribution Carroll County |
1,500 | 2 | 0 | |
|
Town of Pittsville Wicomico County |
1,500 | 2 | 1 | |
|
Royal Farms #206 Anne Arundel County |
1,473 | 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.