Air Quality
Moderate
Water Violations
39
Active Contamination
60
Active Permits
7
Air quality in Larimer County is rated moderate with a median AQI of 54 (274 days measured in 2025). 13 community water systems serve the area, with 39 recent violations in the last 5 years. 21 industrial facilities report toxic chemical releases totaling 77.1 lbs. 62 contamination sites are tracked, all with completed or ongoing remediation.
Air Quality — Larimer County (2025)i
AQSThe Air Quality Index measures how clean or polluted the air is on a given day. AQI is reported at the county level. A score of 0-50 is considered good; 51-100 is moderate; above 100 may be unhealthy for sensitive groups.
Median AQI
PM2.5 Daysi
37Ozone Daysi
236Drinking Wateri
SDWISPublic water systems registered to serve this area. Community systems (CWS) provide water to residents year-round. Violations indicate a system failed to meet federal drinking water standards.
Community Systemsi
13Active Systemsi
42Recent Violationsi
39Recent Violations (Last 5 Years)
EAST LARIMER COUNTY WD
FT COLLINS CITY OF
NUEVA VIDA MOBILE HOME PARK
PINEWOOD MOBILE HOME PARK
SOLDIER CANYON FILTER PLANT
VILLAS THE MHP
TIMBER RIDGE MHP
CSU MAIN AND WEST HOUSING CAMPUS
Historical Violations (Over 5 Years Ago)
SPRING CANYON WSD
Industrial Monitoringi
Toxic Release Inventory (TRI)i
TRIContamination Sitesi
Contaminated sites tracked by the EPA and state agencies. Superfund sites are the most seriously contaminated locations. Brownfields are former industrial properties being cleaned up for reuse. LUST sites have confirmed leaks from underground storage tanks.