Air Quality
Moderate
Water Violations
20
Active Contamination
19
Active Permits
9
Air quality in Jefferson County is rated moderate with a median AQI of 51 (273 days measured in 2025). 9 community water systems serve the area, with 20 recent violations in the last 5 years. 13 industrial facilities report toxic chemical releases totaling 6.0K lbs. 20 contamination sites are tracked, all with completed or ongoing remediation.
Air Quality — Jefferson 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
0Ozone Daysi
273Drinking 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
9Active Systemsi
6Recent Violationsi
20Recent Violations (Last 5 Years)
Historical Violations (Over 5 Years Ago)
RALSTON VALLEY 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.