Maryland — 4th District
119th Congress · 52 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 52 ZIP codes in Maryland's 4th District: the district earns a grade C (55/100). 6 EPA violations on record, 3 health-based.
Top Contaminants
ZIP Codes in This District
52 ZIP codes tracked in Maryland's 4th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 20709 | Laurel | 83 | B | 0 |
| 2 | 20725 | Laurel | 83 | B | 0 |
| 3 | 20726 | Laurel | 83 | B | 0 |
| 4 | 20717 | Bowie | 82 | B | 2 (1 health) |
| 5 | 20718 | Bowie | 82 | B | 2 (1 health) |
| 6 | 20719 | Bowie | 82 | B | 2 (1 health) |
| 7 | 20707 | Laurel | 78 | B | 0 |
| 8 | 20708 | Laurel | 78 | B | 0 |
| 9 | 20769 | Glenn Dale | 63 | C | 0 |
| 10 | 20799 | Capitol Heights | 63 | C | 0 |
| 11 | 20743 | Capitol Heights | 55 | C | 0 |
| 12 | 20745 | Oxon Hill | 55 | C | 0 |
| 13 | 20746 | Suitland | 55 | C | 0 |
| 14 | 20747 | District Heights | 55 | C | 0 |
| 15 | 20784 | Hyattsville | 55 | C | 0 |
| 16 | 20785 | Hyattsville | 55 | C | 0 |
| 17 | 20697 | Southern Md Facility | 53 | D | 0 |
| 18 | 20703 | Lanham | 53 | D | 0 |
| 19 | 20710 | Bladensburg | 53 | D | 0 |
| 20 | 20712 | Mount Rainier | 53 | D | 0 |
| 21 | 20731 | Capitol Heights | 53 | D | 0 |
| 22 | 20738 | Riverdale | 53 | D | 0 |
| 23 | 20741 | College Park | 53 | D | 0 |
| 24 | 20749 | Fort Washington | 53 | D | 0 |
| 25 | 20750 | Oxon Hill | 53 | D | 0 |
| 26 | 20752 | Suitland | 53 | D | 0 |
| 27 | 20757 | Temple Hills | 53 | D | 0 |
| 28 | 20770 | Greenbelt | 53 | D | 0 |
| 29 | 20775 | Upper Marlboro | 53 | D | 0 |
| 30 | 20790 | Capitol Heights | 53 | D | 0 |
| 31 | 20791 | Capitol Heights | 53 | D | 0 |
| 32 | 20797 | Southern Md Facility | 53 | D | 0 |
| 33 | 20866 | Burtonsville | 53 | D | 0 |
| 34 | 20706 | Lanham | 50 | D | 0 |
| 35 | 20735 | Clinton | 50 | D | 0 |
| 36 | 20744 | Fort Washington | 50 | D | 0 |
| 37 | 20748 | Temple Hills | 50 | D | 0 |
| 38 | 20753 | District Heights | 50 | D | 0 |
| 39 | 20705 | Beltsville | 45 | D | 0 |
| 40 | 20722 | Brentwood | 45 | D | 0 |
| 41 | 20740 | College Park | 45 | D | 0 |
| 42 | 20781 | Hyattsville | 45 | D | 0 |
| 43 | 20783 | Hyattsville | 45 | D | 0 |
| 44 | 20704 | Beltsville | 40 | D | 0 |
| 45 | 20737 | Riverdale | 40 | D | 0 |
| 46 | 20742 | College Park | 40 | D | 0 |
| 47 | 20768 | Greenbelt | 40 | D | 0 |
| 48 | 20771 | Greenbelt | 40 | D | 0 |
| 49 | 20782 | Hyattsville | 40 | D | 0 |
| 50 | 20787 | Hyattsville | 40 | D | 0 |
Overview
Maryland's 4th District encompasses 52 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (55/100).
6 EPA violations have been recorded across this district's water systems. 3 are health-based violations. About 6% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Stage 2 DBP Rule - 6 violations
Housing Context
Homes in this district were built on average around 1969 (~57 years old). Older homes may have lead pipes or solder - consider a water filter if your home predates 1986.
Data Sources
- Water quality violations: EPA Safe Drinking Water Information System (SDWIS)
- Congressional district boundaries: U.S. Census Bureau, 119th Congress
- Housing age: U.S. Census Bureau American Community Survey
Updated daily. Data covers 52 ZIP codes in Maryland's 4th District.