Water quality for ZIP code 93257
ZIP 93257 covers Porterville, East Porterville, Poplar-Cotton Center, Woodville, and Woodville Farm Labor Camp in Tulare County, California, one of 40 ZIP codes in the county. 290 active public water systems serve the county; 121 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Tulare County
90 systems, nearest firstNon-community systems in Tulare County (199: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Tulare County, the county this ZIP code lies in, nearest to the ZIP code's centre first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.