Water quality for ZIP code 20664
ZIP 20664 covers Rock Point and Cobb Island in Charles County, Maryland, one of 22 ZIP codes in the county. 172 active public water systems serve the county; 96 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Charles County
48 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Banks Odee |
65 | 1 | 2.8 mi | |
| Cliffton on the Potomac |
744 | 2 | 3.0 mi | |
| Swan Point |
945 | 1 | 3.6 mi | |
| Thunderbird Motel |
60 | 2 | 4.0 mi | |
| Matthews Manor |
45 | 1 | 4.7 mi | |
| Thunderbird Apartments |
40 | 1 | 8.0 mi | |
| Bel Alton |
311 | 2 | 8.6 mi | |
| Chapel Point Wds/ Jude House/ Comm Ctr |
280 | 1 | 8.7 mi | |
| Newtown Village |
170 | 1 | 9.8 mi | |
| Newtown Estates Tip Hill Water Co. |
110 | 1 | 10.0 mi | |
| Mariellen Park |
184 | 1 | 10.7 mi | |
| Ellenwood |
229 | 1 | 11.5 mi | |
| Independence Village |
88 | 1 | 12.3 mi | |
| Town of la Plata |
11,535 | 0 | 12.5 mi | |
| Hawthorne Water Supply, INC |
60 | 1 | 13.6 mi | |
| Parkway Subdivision Water Company |
50 | 1 | 14.1 mi | |
| Garden Estates Central Water |
55 | 2 | 14.9 mi | |
| Mount Carmel Woods |
175 | 1 | 14.9 mi | |
| Oakwood |
45 | 1 | 15.5 mi | |
| Pine Hill Water Company |
140 | 1 | 15.5 mi | |
| Turkey Hill Water Company |
150 | 2 | 15.5 mi | |
| White Plains 1 Mhp/smittys |
100 | 1 | 15.6 mi | |
| White Plains 2 Mhp/jack Blair |
70 | 1 | 15.6 mi | |
| Kings Manor White Plains Water Co, INC |
372 | 1 | 15.9 mi | |
| West White Plains |
50 | 1 | 16.1 mi |
Non-community systems in Charles County (123: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Charles County, the county this ZIP code lies in, nearest to the ZIP code's centre first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
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. Retrieved from ECHO on Oct 11, 2026.