Water quality for ZIP code 85378
ZIP 85378 covers Surprise and Sun City in Maricopa County, Arizona, one of 135 ZIP codes in the county. 217 active public water systems serve the county; 139 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Maricopa County
99 systems, largest first| System | Serves | Status | Rules violated, 3 yr |
|---|---|---|---|
| Mesa City of Mesa |
466,000 | 3 | |
| Gilbert, Town of Gilbert |
247,600 | 9 | |
| Chandler City of Chandler |
247,328 | 4 | |
| Scottsdale City of Scottsdale |
241,361 | 2 | |
| Glendale City of Glendale |
234,766 | 3 | |
| Peoria City of Peoria |
187,676 | 4 | |
| Tempe City of Tempe |
165,000 | 0 | |
| Epcor Agua Fria Surprise |
128,040 | 5 | |
| Avondale City of Avondale |
96,130 | 2 | |
| Queen Creek Town of Queen Creek |
95,502 | 1 | |
| Liberty Water Lpsco Litchfield Park |
57,070 | 1 | |
| Goodyear Water Department Goodyear |
50,001 | 4 | |
| Surprise City of Mountain Vista Surprise |
40,007 | 1 | |
| EL Mirage City of El Mirage |
39,884 | 4 | |
| Epcor Sun City Sun City |
38,016 | 0 | |
| City of Buckeye Valencia Town Division Buckeye |
30,377 | 3 | |
| Epcor Chaparral City Fountain Hills |
26,026 | 2 | |
| Epcor Sun City West Sun City West |
25,796 | 0 | |
| Desert Oasis Surprise |
23,963 | 1 | |
| Epcor Anthem Anthem |
23,826 | 3 | |
| City of Buckeye Sonora Sundance Town Of Buckeye-sono |
21,405 | 2 | |
| Pima Utilities Chandler |
20,000 | 7 | |
| Arizona Water CO White Tanks White Tanks |
18,858 | 2 | |
| Epcor North East Agua Fria Phoenix |
14,723 | 2 | |
| Epcor Paradise Valley/scottsdale Paradise Valley |
14,107 | 2 |
Non-community systems in Maricopa County (117: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Maricopa County, the county this ZIP code lies in, largest 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.
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 Arizona 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.