Air Quality
Moderate
Water Violations
104
Active Contamination
29
Active Permits
7
Air quality in Jefferson County is rated moderate with a median AQI of 51 (273 days measured in 2025). 30 community water systems serve the area, with 104 recent violations in the last 5 years. 4 industrial facilities report toxic chemical releases totaling 45.53 lbs. 29 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
30Active Systemsi
41Recent Violationsi
104Recent Violations (Last 5 Years)
HILLCREST VILLAGE MHP
BERKELEY VILLAGE MOBILE HOME PARK
DENVER CASCADE MHP
OLDE STAGE WD
TABLE MESA VILLAGE MHP
LOOKOUT MOUNTAIN WD
ST MARYS GLACIER WSD
DEER CREEK WD
BLUE MOUNTAIN WD
GOLDEN TERRACE VILLAGE
GOLDEN TERRACE WEST
PUEBLO GRANDE VILLAGE
CIMARRON VILLAGE
Historical Violations (Over 5 Years Ago)
GREEN ACRES MHP
PEAKVIEW MHP
ELDORADO MUNICIPAL SYSTEM
GRACE MAR WUA
KNOLLWOOD MD
ARAPAHOE MHP
SIERRA VISTA HOA
4 WAY RANCH MD 2
GOLDEN TERRACE SOUTH
WHEAT RIDGE WATER DISTRICT
MESA CORTINA WSD
BUFFALO RIDGE ESTATES
BARR LAKE RVP
Industrial Monitoringi
Toxic Release Inventory (TRI)i
TRIWastewater & Stormwater Permits (NPDES)i
NPDESContamination 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.