Air Quality
Good
Water Violations
13
Active Contamination
None
Active Permits
42
Air quality in Johnston County is rated good with a median AQI of 42 (273 days measured in 2025). 16 community water systems serve the area, with 13 recent violations in the last 5 years. 1 contamination site are tracked, all with completed or ongoing remediation.
Air Quality — Johnston 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
194Ozone Daysi
79Drinking 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
16Active Systemsi
2Recent Violationsi
13Recent Violations (Last 5 Years)
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.
No active contamination sites.