612 water systems in Maryland have at least one health-based violation on record. The system with the most health-based violations is Echo Valley MHP in North East with 40 health-based violations. Health-based violations mean a system exceeded an EPA maximum contaminant level or failed required treatment standards.
| Water System | City | Population | Health Violations | Total Violations |
|---|
| Echo Valley MHP |
North East | 60 |
40 | 194 |
| Town of North East |
North East | 8,600 |
24 | 34 |
| Wee Lad & Lassie Early Learning |
Arnold | 40 |
22 | 28 |
| Golden Kay Apartments |
Elkton | 148 |
21 | 106 |
| Wylder Hotel Tilghman Island |
Tilghman Island | 80 |
21 | 27 |
| Springfield Hospital Distribution |
Sykesville | 1,500 |
20 | 26 |
| Central Precision |
Boonsboro | 55 |
20 | 25 |
| Town of Perryville |
Perryville | 4,413 |
14 | 63 |
| Phelps Mobile Home Villa |
Gaithersburg | 98 |
14 | 23 |
| City of Havre De Grace |
Havre De Grace | 14,000 |
10 | 78 |
| Crossroads Station |
Windsor Mill | 25 |
10 | 32 |
| Highland Community Asc./Child. Cntr. N. |
Street | 165 |
10 | 30 |
| Shore Stop #256 Milford |
Salisbury | 150 |
10 | 10 |
| City of Pocomoke City |
Pocomoke City | 4,100 |
9 | 16 |
| Irish Creek MHP |
Ellicott City | 90 |
8 | 172 |
| St Pauls Lutheran Church and School |
Joppa | 150 |
8 | 82 |
| Ridgeview MHP |
Rising Sun | 55 |
8 | 80 |
| Glen Meadows Retirement Community |
Glen Arm | 468 |
8 | 36 |
| Manor Shopping Center |
Phoenix | 2,921 |
8 | 35 |
| Jacobs Well Assisted Living Home |
Bel Air | 31 |
8 | 33 |
| Cedar Mobile Home Park |
Columbia | 300 |
8 | 27 |
| Town of St. Michaels |
St Michaels | 2,650 |
8 | 16 |
| Town of Snow Hill |
Snow Hill | 2,409 |
8 | 16 |
| Perry Point V.A. Medical Center |
Perry Point | 2,000 |
8 | 16 |
| Perdue Farms Inc. - Feed Mill |
Salisbury | 400 |
8 | 15 |
| Austin Plaza North |
Millington | 112 |
8 | 13 |
| Childtime of Churchville/Aberdeen |
Bel Air | 115 |
7 | 33 |
| Eagle's Nest Golf and Country Club |
Phoenix | 70 |
7 | 33 |
| Tebbston on Magothy |
Westminster | 52 |
7 | 33 |
| Princess Royale Hotel Distribution |
Ocean City | 80 |
7 | 24 |
| Harford Academy |
Bel Air | 292 |
7 | 19 |
| Freedom District |
Westminster | 24,867 |
7 | 16 |
| Plumpton Park Zoo Snack Bar |
Rising Sun | 100 |
7 | 7 |
| Most Blessed Sacrament School |
Berlin | 244 |
6 | 20 |
| Town of Betterton |
Betterton | 481 |
6 | 16 |
| Monkton Country Day Care & Preschool |
Monkton | 40 |
6 | 16 |
| Reisterstown Lumber Company |
Reisterstown | 75 |
6 | 15 |
| Edrich Lumber Company |
Windsor Mill | 60 |
6 | 10 |
| Mt. Harmony United Methodist Church |
Owings | 155 |
6 | 6 |
| Bucks |
Berlin | 103 |
6 | 6 |
| Jarrettsville Carroll Fuel |
Jarrettsville | 102 |
6 | 6 |
| Pinkney Park |
Centreville | 40 |
6 | 6 |
| Shore Stop #270 Milton |
Salisbury | 25 |
6 | 6 |
| Hunt Valley Golf & Country Club |
Phoenix | 200 |
5 | 40 |
| Hillendale Country Club |
Phoenix | 315 |
5 | 39 |
| Midland-Lonaconing |
Lonaconing | 5,000 |
5 | 26 |
| Capozzolos Motel |
Clarksburg | 25 |
5 | 24 |
| Hydetown Park East |
White Hall | 29 |
5 | 23 |
| Ocean Downs, LLC |
Berlin | 235 |
5 | 22 |
| Nazarene Day Care Center |
Colora | 100 |
5 | 22 |
| Christmas Tree Farm Trailer Park |
Leonardtown | 100 |
5 | 21 |
| Shelter Cove Yacht and Marina Inc |
North East | 59 |
5 | 21 |
| White Oak Mobile Home Park |
Swanton | 32 |
5 | 17 |
| Cathcart Rail (Appalachian Tank Car Ser) |
Elk Mills | 28 |
5 | 14 |
| Naylor Mill Village Mobile Home Park |
Fruitland | 180 |
5 | 12 |
| Liberty Mobile Home Park |
Federalsburg | 40 |
5 | 11 |
| Fort Detrick |
Frederick | 7,900 |
5 | 10 |
| Plumpton Park Zoo Grounds |
Rising Sun | 100 |
5 | 10 |
| Chesapeake Landing Restaurant |
Saint Michaels | 320 |
5 | 8 |
| Smokey Glen Farm - Picnic Pavillion |
Gaithersburg | 400 |
5 | 7 |
| Falling Branch Brewery |
Street | 105 |
5 | 7 |
| Fair Meadows |
Bel Air | 50 |
4 | 58 |
| City of Baltimore |
Baltimore | 1,600,000 |
4 | 48 |
| Harford Community College - Main Campus |
Bel Air | 2,500 |
4 | 28 |
| Susquehanna Inn |
Conowingo | 79 |
4 | 26 |
| West Nottingham Presbyterian Church |
Colora | 56 |
4 | 26 |
| Town of Cecilton |
Cecilton | 477 |
4 | 19 |
| Our House Job Training Center for Youth |
Brookeville | 30 |
4 | 18 |
| Harford Technical High School |
Bel Air | 1,187 |
4 | 16 |
| Liberty Marina |
Edgewater | 112 |
4 | 16 |
| A.I.M. Corporation |
Parkton | 80 |
4 | 15 |
| Grauls Superthrift Market |
Parkton | 25 |
4 | 15 |
| Bloch & Guggenheimer Co. |
Hurlock | 250 |
4 | 14 |
| St. John the Evangelist Catholic School |
Hydes | 230 |
4 | 14 |
| Union Memorial Umc |
Davidsonville | 50 |
4 | 14 |
| Stockton Head Start |
Stockton | 68 |
4 | 13 |
| Gilberts Mobile Home Park |
Middletown | 75 |
4 | 12 |
| Hyatt Park #1 |
Ijamsville | 75 |
4 | 12 |
| Pohanka Ford of Salisbury |
Salisbury | 60 |
4 | 12 |
| Village Green Mobile Home Park |
Crofton | 220 |
4 | 11 |
| Cedarhurst Mobile Home Park |
Salisbury | 220 |
4 | 11 |
| Tidewater Direct LLC |
Centreville | 150 |
4 | 10 |
| T.E.C. Building Partnership |
Ijamsville | 25 |
4 | 10 |
| City of Westminster |
Westminster | 35,256 |
4 | 8 |
| Stevenson University |
Stevenson | 1,313 |
4 | 8 |
| Friendly Farms |
Upperco | 55 |
4 | 8 |
| Harford Center Inc. |
Havre De Grace | 150 |
4 | 7 |
| Breit - 4840/4844 Winchester Boulevard |
Lutherville | 61 |
4 | 7 |
| Honey's Pawn Run Tavern |
Oakland | 25 |
4 | 6 |
| Brown Cleary Building (Calvert Animal) |
Owings | 150 |
4 | 4 |
| Townhill Hotel B and B |
Little Orleans | 26 |
4 | 4 |
| River Bend Membership Corporation |
Hagerstown | 2,500 |
3 | 64 |
| Circle of Care Early Learners |
Elkton | 40 |
3 | 48 |
| Christian Child Care Center of Whiteford |
Whiteford | 200 |
3 | 36 |
| The Oaks of Thonotosassa MHP |
Potomac | 330 |
3 | 33 |
| Concourse Commercial Condo, Inc. |
Potomac | 100 |
3 | 33 |
| Saint James School |
Hagerstown | 200 |
3 | 29 |
| Independence Village |
Charlotte Hall | 88 |
3 | 29 |
| Jefferson Patterson Park and Museum |
St. Leonard | 35 |
3 | 25 |
| Wssc-Western Branch |
Upper Marlboro | 32 |
3 | 24 |