Environment
Foothills High — Environment & Air Quality
Air quality, drinking-water safety and environmental hazards within 1–5 miles of Foothills High in San Marcos, California.
Latest Air Quality Index
34
Good · monitor 21.3 km away
PM2.5 annual5.0 µg/m³
Water health violations 10yr0
TRI sites within 1 mi0
Air Quality
EPA AirNow + AQS · 2024
34
AQI latest — Good
34
AQI 7-day avg
0
Days unhealthy in last 90
5.0
PM2.5 annual µg/m³ (EPA NAAQS limit: 9.0)
35.5
Ozone annual ppb
13.1
NO₂ annual ppb
Public Water System
VALLECITOS WD · PWS CA3710002
0
Health-based violations (10yr)
0
Acute violations (10yr)
113,500
Population served
4H
Most recent violation type
2025-07-02
Nearby Environmental Hazards
EPA Superfund (NPL), TRI release sites, brownfields (2024)
0
TRI sites within 1 mile
19
TRI sites within 5 miles
13.7 mi
Nearest Superfund (NPL)
CAMP PENDLETON MARINE CORPS BASE
2.5 mi
Nearest brownfield
256 W MISSION ROAD CITY OF SAN MARCOS CA
Sources: school_air_quality + school_air_quality_daily (EPA AQS / AirNow), school_water_safety (EPA SDWIS), school_env_hazards (EPA NPL / TRI / Brownfields).