Air Quality
Good
Water Violations
52
Active Contamination
3
Active Permits
9
Air quality in Douglas County is rated good with a median AQI of 49 (273 days measured in 2025). 11 community water systems serve the area, with 52 recent violations in the last 5 years. 3 contamination sites are tracked, all with completed or ongoing remediation.
Air Quality — Douglas 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
36Ozone Daysi
237Drinking 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
11Active Systemsi
29Recent Violationsi
52Recent Violations (Last 5 Years)
CONSOLIDATED BELL MTN RANCH MD
CASTLE PINES VILLAGE MD
CASTLE ROCK TOWN OF
LOUVIERS WSD
SILVER HEIGHTS WSD
ACADEMY WSD
Historical Violations (Over 5 Years Ago)
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.