States/AZ

Sewer overflows in Arizona

Sewer overflow record — reported spills, the worst utilities, and how often overflows reached waterways in Arizona.

Reported events
264
Total volume
432K gal
Reached waterways
0(0%)
Latest event
Jun 12, 2026

Worst utilities in Arizona

Ranked by number of reported overflow events.

#UtilityEventsVolumeReached water
1CITY OF PHOENIX - 91ST AVENUE Collection System40432K gal0
2USDOI NPS - GRAND CANYON NP310 gal0
3CITY OF YUMA - DEPARTMENT OF PUBLIC WORKS150 gal0
4CITY OF COTTONWOOD140 gal0
5TOWN OF PRESCOTT VALLEY130 gal0
6CITY OF BUCKEYE120 gal0
7CITY OF CASA GRANDE120 gal0
8CITY OF PEORIA90 gal0
9APACHE JUNCTION SEWER DISTRICT80 gal0
10CITY OF MESA - WATER RESOURCES70 gal0
11CITY OF BULLHEAD CITY70 gal0
12NORTHERN GILA COUNTY SANITARY DISTRICT - DBA GREEN60 gal0
13CITY OF TOLLESON60 gal0
14TOWN OF MARANA60 gal0
15CITY OF BUCKEYE50 gal0
16CITY OF EL MIRAGE50 gal0
17CITY OF FLAGSTAFF - WILDCAT HILL WWTP50 gal0
18CITY OF GLOBE40 gal0
19CITY OF GOODYEAR40 gal0
20CITY OF MESA - WATER RESOURCES40 gal0
21CITY OF GOODYEAR30 gal0
22TOWN OF FLORENCE30 gal0
23TOWN OF CAVE CREEK30 gal0
24CITY OF PHOENIX20 gal0
25TOWN OF GILA BEND20 gal0
26CITY OF BISBEE20 gal0
27TOWN OF JEROME10 gal0
28USDOI NPS - GRAND CANYON NP10 gal0
29FLAGSTAFF UTILITIES DIVISION10 gal0
30CITY OF AVONDALE10 gal0

Biggest spills in Arizona

The largest single reported overflow events.