Air Quality
Moderate
Water Violations
5
Air quality in Harris County is rated moderate with a median AQI of 63 (274 days measured in 2025). 19 community water systems serve the area, with 5 recent violations in the last 5 years.
Air Quality — Harris 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
172Ozone Daysi
81Drinking 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
19Active Systemsi
14Recent Violationsi
5Recent Violations (Last 5 Years)
Historical Violations (Over 5 Years Ago)
BRAZORIA COUNTY MUD 21
BRAZORIA COUNTY MUD 22
FORT BEND COUNTY MUD 30
CINCO MUD 12
FORT BEND COUNTY WCID 3
FORT BEND COUNTY MUD 117
