Arizona
Santa Cruz County drinking water quality
37 active public water systems serve 50,154 people in Santa Cruz County. 5 are compliant, 32 had at least one EPA violation in the past three years, 3 are designated serious violators, and 7 carry a health flag.
Needs attention
Community water systems
17 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Nogales City of Nogales |
22,000 | 7 | 0 | |
|
Liberty Water Rio Rico Rio Rico |
17,960 | 3 | 0 | |
|
Valle Verde Water Company East Nogales |
2,397 | 4 | 0 | |
|
Epcor Tubac Tubac |
2,076 | 0 | 0 | |
|
Baca Float Water Company Tubac |
1,162 | 1 | 0 | |
|
Patagonia Water Department Patagonia |
819 | 1 | 0 | |
|
Town & Country Preston Nogales |
430 | 6 | 5 | |
|
Kino Ranch 2 Nogales |
173 | 4 | 0 | |
|
Sonoita Valley (south) Water Company Sonoita |
172 | 4 | 2 | |
|
The Grand Acres Nogales |
153 | 4 | 1 | |
|
Avalon Gardens Water System Tubac |
100 | 2 | 2 | |
|
Mountain View RV Ranch Green Valley |
100 | 2 | 0 | |
|
CS Santa Cruz Water CO Fort Huachuca |
82 | 5 | 0 | |
|
Trujillo Trail Dwid Tubac |
78 | 3 | 0 | |
|
Sonoita Valley (north) Water Company Sonoita |
49 | 0 | 0 | |
|
Casas Arroyo Association INC Sonoita |
27 | 4 | 0 | |
|
Red Rock Acres HOA Patagonia |
23 | 2 | 0 |
Non-community systems (20: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
AZ State Pks Patagonia Lake Patagonia |
564 | 0 | 0 | |
|
Santa Cruz County Fairgrounds Sonoita |
297 | 3 | 1 | |
|
DE Anza Trail RV Tubac |
200 | 2 | 0 | |
|
Tumacacori National Historic Park Nogales |
170 | 2 | 0 | |
|
Elgin School Elgin |
150 | 4 | 0 | |
|
Sonoita Mercantile Water System Sonoita |
125 | 3 | 0 | |
|
Ac's Truck Stop Nogales |
110 | 1 | 0 | |
|
Adot Border Patrol Sonoita |
100 | 5 | 0 | |
|
Gen Properties LLC Nogales |
100 | 2 | 0 | |
|
Parcel 1 Water Amado |
100 | 1 | 1 | |
|
Wisdom Cafe Tumacacori |
100 | 3 | 0 | |
|
Valle Verde Water Company West Nogales |
74 | 3 | 0 | |
|
Crisantes Greenhouse Water System Amado |
60 | 6 | 1 | |
|
Smithsonian Inst II Amado |
35 | 2 | 1 | |
|
Usfs Cnf Bog Springs Madera Canyon |
35 | 0 | 0 | |
|
Sonoita Springs Water Company Sonoita |
30 | 3 | 2 | |
|
Patagonia RV Park Patagonia |
28 | 1 | 0 | |
|
Old Tumacacori Bar Tumacacori |
25 | 2 | 0 | |
|
Patagonia Sonoita Creek Preserve Patagonia |
25 | 1 | 0 | |
|
Usfs-Cnf Nogales Admin Nogales |
25 | 0 | 0 |
Inactive systems (33, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.