Daylight through the yearLongest day (Jun 21): 14 h 49 min5:43 am – 8:32 pmShortest day (Dec 21): 9 h 31 min7:18 am – 4:49 pm
Sun todaySunrise –Sunset –
Natural hazardsOverall risk Relatively HighSan Joaquin County, CA, compared with all US countiesHigher-risk hazardsDrought Very HighEarthquake Relatively HighRiver flooding Relatively HighHeat wave Relatively HighSource: FEMA National Risk Index (county level)
Air quality60% of days had good air in 2025219 of 365 days measured146 moderate daysMedian index 46, worst day 93main pollutant: fine particles (PM2.5)Source: US EPA Air Quality Index, San Joaquin County monitors, CA
Drinking waterCity of Stocktonserves 191,302 people from surface water2 health-based violations since 2021latest Apr 2023: trihalomethanes (TTHM), maximum contaminant level2 monitoring or reporting violations since 2021Source: US EPA Safe Drinking Water Information System, largest system serving the town
