Maryland Water Quality
According to EPA Safe Drinking Water Information System (SDWIS), Maryland has 481 active community water systems in this extract. PlainEnviro's health-based slice lists 556 violation records across 50 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.
Health-based violation records for 481 community water systems in Maryland. Source: EPA Safe Drinking Water Information System (SDWIS).
Water Systems with Most Health-Based Records
| # | Water System | Health-Based Records | Health |
|---|---|---|---|
| 1 | ECHO VALLEY MHP North East | 41 | Yes |
| 2 | TOWN OF NORTH EAST North East | 26 | Yes |
| 3 | SPRINGFIELD HOSPITAL DISTRIBUTION Sykesville | 22 | Yes |
| 4 | GOLDEN KAY APARTMENTS Elkton | 21 | Yes |
| 5 | TOWN OF PERRYVILLE Perryville | 16 | Yes |
| 6 | PHELPS MOBILE HOME VILLA Gaithersburg | 14 | Yes |
| 7 | CITY OF HAVRE DE GRACE Havre De Grace | 10 | Yes |
| 8 | CITY OF POCOMOKE CITY Pocomoke City | 9 | Yes |
| 9 | GLEN MEADOWS RETIREMENT COMMUNITY Glen Arm | 8 | Yes |
| 10 | CEDAR MOBILE HOME PARK Columbia | 8 | Yes |
| 11 | PERRY POINT V.A. MEDICAL CENTER Perry Point | 8 | Yes |
| 12 | TOWN OF ST. MICHAELS St Michaels | 8 | Yes |
| 13 | TOWN OF SNOW HILL Snow Hill | 8 | Yes |
| 14 | RIDGEVIEW MHP Rising Sun | 8 | Yes |
| 15 | TEBBSTON ON MAGOTHY Westminster | 7 | Yes |
| 16 | FREEDOM DISTRICT Westminster | 7 | Yes |
| 17 | IRISH CREEK MHP Ellicott City | 7 | Yes |
| 18 | TOWN OF BETTERTON Betterton | 6 | Yes |
| 19 | MIDLAND-LONACONING Lonaconing | 5 | Yes |
| 20 | LIBERTY MOBILE HOME PARK Federalsburg | 5 | Yes |
| 21 | RELIANCE MOBILE HOME PARK | 5 | Yes |
| 22 | FORT DETRICK Frederick | 5 | Yes |
| 23 | WHITE OAK MOBILE HOME PARK Swanton | 5 | Yes |
| 24 | CHRISTMAS TREE FARM TRAILER PARK Leonardtown | 5 | Yes |
| 25 | COUNTRY VILLAGE MOBILE HOME PARK Clarksburg | 5 | Yes |
| 26 | NAYLOR MILL VILLAGE MOBILE HOME PARK Fruitland | 5 | Yes |
| 27 | HYDETOWN PARK EAST White Hall | 5 | Yes |
| 28 | THE OAKS OF THONOTOSASSA MHP Potomac | 4 | Yes |
| 29 | VILLAGE GREEN MOBILE HOME PARK Crofton | 4 | Yes |
| 30 | HOLLY COVE HARBOR MOBILE HOME PARK Federalsburg | 4 | Yes |
| 31 | CITY OF WESTMINSTER Westminster | 4 | Yes |
| 32 | TOWN OF CECILTON Cecilton | 4 | Yes |
| 33 | BAY COUNTRY ESTATES MOBILE HOME PARK Rising Sun | 4 | Yes |
| 34 | GILBERTS MOBILE HOME PARK Middletown | 4 | Yes |
| 35 | PINEY CREEK CORPORATION Chester | 4 | Yes |
| 36 | BROOK LANE HEALTH SERVICES | 4 | Yes |
| 37 | CEDARHURST MOBILE HOME PARK Salisbury | 4 | Yes |
| 38 | CITY OF BALTIMORE Baltimore | 4 | Yes |
| 39 | REGENCY PARK ASSISTED LIVING RESIDENCE Gambrills | 4 | Yes |
| 40 | LAVALE SANITARY COMMISSION Lavale | 3 | Yes |
| 41 | TOWN OF WESTERNPORT Westernport | 3 | Yes |
| 42 | TOWN OF PRESTON Preston | 3 | Yes |
| 43 | WOODBINE VILLAGE MOBILE HOME PARK Potomac | 3 | Yes |
| 44 | ROCKBROOK VILLAGE MOBILE HOME PARK Ellicott City | 3 | Yes |
| 45 | SULLIVANS MOBILE HOME PARK COMMUNITY Ellicott City | 3 | Yes |
| 46 | WEST NOTTINGHAM ACADEMY Colora | 3 | Yes |
| 47 | PLEASANT HILL MOBILE HOME PARK Childs | 3 | Yes |
| 48 | TOWN & COUNTRY MOBILE HOME PARK North East | 3 | Yes |
| 49 | INDEPENDENCE VILLAGE Charlotte Hall | 3 | Yes |
| 50 | CLOVERHILL 3 - CONSECUTIVE TO MD0100015 Frederick | 3 | Yes |
Most Common Contaminants in Maryland
| Contaminant | Violations | Systems Affected |
|---|---|---|
| LEAD AND COPPER RULE REVISIONS | 136 | 109 |
| Lead and Copper Rule | 117 | 57 |
| Groundwater Rule | 71 | 11 |
| TTHM | 65 | 13 |
| Total Haloacetic Acids (HAA5) | 44 | 9 |
| Revised Total Coliform Rule | 20 | 10 |
| Arsenic | 20 | 3 |
| Combined Radium (-226 and -228) | 14 | 1 |
| CARBON, TOTAL | 14 | 2 |
| Di(2-ethylhexyl) phthalate | 14 | 1 |
| Nitrate | 9 | 5 |
| Interim Enhanced Surface Water Treatment Rule | 8 | 4 |
| Long Term 2 Enhanced Surface Water Treatment Rule | 6 | 4 |
| Surface Water Treatment Rule | 6 | 6 |
| Lead | 4 | 1 |
Cities with Water Quality Issues
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About This Data
Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in Maryland are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.