Maryland — 3rd District
119th Congress · 48 ZIP codes · Avg score 61/100 · Grade C · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 48 ZIP codes in Maryland's 3rd District: the district earns a grade C (61/100). 82 EPA violations on record, 12 health-based.
Top Contaminants
ZIP Codes in This District
48 ZIP codes tracked in Maryland's 3rd District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 21402 | Annapolis | 83 | B | 1 |
| 2 | 21404 | Annapolis | 83 | B | 1 |
| 3 | 21405 | Annapolis | 83 | B | 1 |
| 4 | 21411 | Annapolis | 83 | B | 1 |
| 5 | 21412 | Annapolis | 83 | B | 1 |
| 6 | 21240 | Baltimore | 81 | B | 11 (2 health) |
| 7 | 21090 | Linthicum Heights | 77 | B | 3 (1 health) |
| 8 | 21144 | Severn | 77 | B | 2 (1 health) |
| 9 | 21108 | Millersville | 74 | B | 5 (1 health) |
| 10 | 21401 | Annapolis | 73 | B | 1 |
| 11 | 21409 | Annapolis | 73 | B | 1 |
| 12 | 21146 | Severna Park | 72 | B | 3 (1 health) |
| 13 | 21041 | Ellicott City | 69 | C | 5 (1 health) |
| 14 | 21403 | Annapolis | 68 | C | 1 |
| 15 | 20723 | Laurel | 65 | C | 0 |
| 16 | 21268 | Baltimore | 64 | C | 11 (2 health) |
| 17 | 20701 | Annapolis Junction | 63 | C | 0 |
| 18 | 21056 | Gibson Island | 63 | C | 0 |
| 19 | 21076 | Hanover | 63 | C | 0 |
| 20 | 21077 | Harmans | 63 | C | 0 |
| 21 | 21044 | Columbia | 62 | C | 6 |
| 22 | 21045 | Columbia | 62 | C | 6 |
| 23 | 21046 | Columbia | 62 | C | 6 |
| 24 | 20794 | Jessup | 59 | C | 6 (1 health) |
| 25 | 21042 | Ellicott City | 59 | C | 5 (1 health) |
| 26 | 21032 | Crownsville | 55 | C | 0 |
| 27 | 21060 | Glen Burnie | 55 | C | 0 |
| 28 | 21061 | Glen Burnie | 55 | C | 0 |
| 29 | 21075 | Elkridge | 55 | C | 0 |
| 30 | 21225 | Brooklyn | 55 | C | 0 |
| 31 | 21043 | Ellicott City | 54 | D | 5 (1 health) |
| 32 | 20759 | Fulton | 53 | D | 0 |
| 33 | 20763 | Savage | 53 | D | 0 |
| 34 | 20777 | Highland | 53 | D | 0 |
| 35 | 21029 | Clarksville | 53 | D | 0 |
| 36 | 21062 | Glen Burnie | 53 | D | 0 |
| 37 | 21104 | Marriottsville | 53 | D | 0 |
| 38 | 21123 | Pasadena | 53 | D | 0 |
| 39 | 21737 | Glenelg | 53 | D | 0 |
| 40 | 21738 | Glenwood | 53 | D | 0 |
| 41 | 21797 | Woodbine | 53 | D | 0 |
| 42 | 21012 | Arnold | 50 | D | 0 |
| 43 | 21036 | Dayton | 40 | D | 0 |
| 44 | 21150 | Simpsonville | 40 | D | 0 |
| 45 | 21723 | Cooksville | 40 | D | 0 |
| 46 | 21765 | Lisbon | 40 | D | 0 |
| 47 | 21794 | West Friendship | 40 | D | 0 |
| 48 | 21122 | Pasadena | 35 | F | 0 |
Overview
Maryland's 3rd District encompasses 48 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (61/100).
82 EPA violations have been recorded across this district's water systems. 12 are health-based violations. About 44% 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 - 20 violations
- Surface Water Treatment Rule - 16 violations
- Consumer Confidence Report Rule - 16 violations
- Stage 1 DBP Rule - 9 violations
- Nickel - 8 violations
Housing Context
Homes in this district were built on average around 1984 (~42 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 48 ZIP codes in Maryland's 3rd District.