Air Quality
Moderate
Water Violations
76
Active Contamination
24
Active Permits
8
Air quality in Jefferson County is rated moderate with a median AQI of 51 (273 days measured in 2025). 50 community water systems serve the area, with 76 recent violations in the last 5 years. 24 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
50Active Systemsi
40Recent Violationsi
76Recent Violations (Last 5 Years)
CREEKSIDE SOUTH ESTATES METRO DISTRICT
KIMBERLY HILLS MHP
LAMPLIGHTER MHP
THORNTON ESTATES
SIERRA BONITA ESTATES
COUNTRYSIDE OF LONGMONT
GRAND MEADOW OF LONGMONT MHP
LONGVIEW MHP
SEDALIA WSD
SPRING VALLEY MD NO 1
CANTERBURY PARK
CANYON RIDGE
LAMPLIGHTER RHP
THE SPRINGS MHP
SADDLEBACK RV
ELEVADO ESTATES LLC
SHERIDAN MHP
GREEN MOUNTAIN WSD
Historical Violations (Over 5 Years Ago)
COMMERCE HEIGHTS
WIKIUP MHP
COUNTRYSIDE VILLAGE OF DENVER
RIVERDALE PEAKS II MD
CONSOLIDATED MUTUAL MAPLE GROVE
INSPIRATION VALLEY MHP
CONSOLIDATED MUTUAL WATER COMPANY
MEADOWBROOK WD
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.