California — 48th District
119th Congress · 47 ZIP codes · Avg score 70/100 · Grade B · Updated 2026-03-22
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-03-22
Top Contaminants
ZIP Codes in This District
47 ZIP codes tracked in California's 48th District.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 92074 | Poway | 99 | A | 0 |
| 2 | 92088 | Fallbrook | 95 | A | 0 |
| 3 | 92091 | Rancho Santa Fe | 95 | A | 0 |
| 4 | 92028 | Fallbrook | 90 | A | 0 |
| 5 | 91906 | Campo | 89 | A | 5 (1 health) |
| 6 | 92070 | Santa Ysabel | 87 | A | 10 (1 health) |
| 7 | 92064 | Poway | 85 | A | 0 |
| 8 | 92061 | Pauma Valley | 84 | B | 5 |
| 9 | 92040 | Lakeside | 81 | B | 6 |
| 10 | 92082 | Valley Center | 81 | B | 0 |
| 11 | 92060 | Palomar Mountain | 80 | B | 6 |
| 12 | 92589 | Temecula | 80 | B | 7 |
| 13 | 92591 | Temecula | 80 | B | 7 |
| 14 | 92592 | Temecula | 80 | B | 7 |
| 15 | 92593 | Temecula | 80 | B | 7 |
| 16 | 92026 | Escondido | 78 | B | 0 |
| 17 | 92027 | Escondido | 78 | B | 0 |
| 18 | 92536 | Aguanga | 75 | B | 0 |
| 19 | 92590 | Temecula | 75 | B | 7 |
| 20 | 92004 | Borrego Springs | 74 | B | 4 |
| 21 | 91917 | Dulzura | 73 | B | 0 |
| 22 | 92003 | Bonsall | 73 | B | 0 |
| 23 | 91903 | Alpine | 66 | C | 31 (11 health) |
| 24 | 91905 | Boulevard | 66 | C | 0 |
| 25 | 91916 | Descanso | 66 | C | 0 |
| 26 | 91934 | Jacumba | 66 | C | 0 |
| 27 | 91935 | Jamul | 66 | C | 41 (23 health) |
| 28 | 91948 | Mount Laguna | 66 | C | 0 |
| 29 | 91980 | Tecate | 66 | C | 0 |
| 30 | 91987 | Tecate | 66 | C | 0 |
| 31 | 92059 | Pala | 66 | C | 0 |
| 32 | 92066 | Ranchita | 66 | C | 0 |
| 33 | 92072 | Santee | 66 | C | 10 (8 health) |
| 34 | 92143 | San Ysidro | 66 | C | 0 |
| 35 | 91901 | Alpine | 65 | C | 31 (11 health) |
| 36 | 92019 | El Cajon | 65 | C | 0 |
| 37 | 92071 | Santee | 65 | C | 10 (8 health) |
| 38 | 92086 | Warner Springs | 65 | C | 2 |
| 39 | 92065 | Ramona | 61 | C | 28 (6 health) |
| 40 | 91963 | Potrero | 55 | C | 47 (39 health) |
| 41 | 91990 | Potrero | 55 | C | 47 (39 health) |
| 42 | 92036 | Julian | 46 | D | 21 (12 health) |
| 43 | 91962 | Pine Valley | 45 | D | 29 (15 health) |
| 44 | 92563 | Murrieta | 42 | D | 7 (7 health) |
| 45 | 92564 | Murrieta | 42 | D | 7 (7 health) |
| 46 | 92562 | Murrieta | 37 | F | 7 (7 health) |
| 47 | 91931 | Guatay | 33 | F | 34 (31 health) |
Overview
California's 48th District serving an estimated 1,968,484 residents encompasses 47 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (70/100).
423 EPA violations have been recorded across this district's water systems. 226 are health-based violations. About 55% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Combined Radium — 86 violations
- Barium — 86 violations
- Consumer Confidence Report Rule — 77 violations
- Lead — 61 violations
- Haloacetic Acids (HAA5) — 17 violations
Housing Context
Homes in this district were built on average around 1983 (~43 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.
Lead Alert: 6 ZIP codes in this district exceed the EPA action level for lead. Consider using a certified lead-removal filter.
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 47 ZIP codes in California's 48th District.