All water systems in Maryland
3,216 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Brooke Grove Retirement Village Montgomery County |
390 | 0 | 0 | |
|
Cattail Creek Country Club Howard County |
390 | 0 | 0 | |
|
Calvert Elementary Cecil County |
389 | 1 | 0 | |
|
Dominos Pizza and Subway Hampstead Carroll County |
385 | 0 | 0 | |
|
Mt. Hope/ Nanjemoy Elementary School Charles County |
385 | 0 | 0 | |
|
Lake Haven Mobile Home Park Worcester County |
384 | 1 | 0 | |
|
Jarrettsville Plaza Shopping Center Harford County |
383 | 0 | 0 | |
|
Cavalier Country Calvert County |
381 | 0 | 0 | |
|
Cardinal Hickey Academy Calvert County |
380 | 0 | 0 | |
|
Chester River Yacht Club Kent County |
380 | 0 | 0 | |
|
Little Flower School St. Mary's County |
380 | 1 | 0 | |
|
Maryvale Preparatory School Baltimore County |
380 | 1 | 0 | |
|
Plim Plaza Hotel Distribution Worcester County |
380 | 1 | 0 | |
|
Providence School Cecil County |
380 | 0 | 0 | |
|
White Rock Yachting Center Well #1 Anne Arundel County |
380 | 0 | 0 | |
|
Old Forge Elementary School Washington County |
378 | 1 | 0 | |
|
Benedict Charles County |
376 | 1 | 0 | |
|
Mayo Elementary Anne Arundel County |
375 | 1 | 0 | |
|
Kings Manor White Plains Water Co, INC Charles County |
372 | 1 | 0 | |
|
Leeds Elementary Cecil County |
372 | 0 | 0 | |
|
Carroll Manor Elementary School Baltimore County |
370 | 0 | 0 | |
|
Greenbrier Elementary School Washington County |
370 | 1 | 0 | |
|
Town of Kitzmiller Garrett County |
370 | 0 | 0 | |
|
Glenwood Community Center Howard County |
366 | 2 | 0 | |
|
Dunkin Donuts Woodbine Howard County |
363 | 0 | 0 | |
|
Highs of Fulton Howard County |
363 | 0 | 0 | |
|
Calvert Cliffs Nuclear Office Building Calvert County |
362 | 0 | 0 | |
|
Royal Farms Store Howard County |
362 | 0 | 0 | |
|
Shores of Calvert Calvert County |
361 | 0 | 0 | |
|
Friendship Baptist Church Howard County |
357 | 0 | 0 | |
|
Ringgold Church of Christ Washington County |
357 | 0 | 0 | |
|
Paradise Mennonite School Washington County |
355 | 1 | 0 | |
|
St. James Academy Baltimore County |
355 | 0 | 0 | |
|
Urbana Vfd Frederick County |
355 | 0 | 0 | |
|
Tiffanee & CO Bakery/goodwill Harford County |
354 | 0 | 0 | |
|
ST Ignatius Church and ST Thomas Manor Charles County |
353 | 1 | 0 | |
|
Hardees and Kent Island Queen Anne's County |
351 | 0 | 0 | |
|
Monocacy Elementary School Montgomery County |
351 | 2 | 1 | |
|
Bloomington Garrett County |
350 | 1 | 0 | |
|
Calvert Beach Decatur Street Calvert County |
350 | 1 | 0 | |
|
Carroll Fuel (urbana Pike) Frederick County |
350 | 0 | 0 | |
|
Gerstell Academy Carroll County |
350 | 0 | 0 | |
|
Lake Shore Elementary Anne Arundel County |
350 | 1 | 1 | |
|
Mechanicsville Elementary St. Mary's County |
350 | 0 | 0 | |
|
St. Leonard Calvert County |
350 | 0 | 0 | |
|
St. Stephen School Baltimore County |
350 | 3 | 0 | |
|
Summerhill Mobile Home Park Anne Arundel County |
350 | 2 | 0 | |
|
Tri-State Christian Academy Cecil County |
350 | 3 | 0 | |
|
West Friendship Elementary School Howard County |
350 | 0 | 0 | |
|
Redeemer Classical Christian School Baltimore County |
346 | 1 | 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.