Santa Cruz County, Arizona — public water systems
At a glance
37 active public water systems are filed under Santa Cruz County, Arizona in EPA's SDWIS records, together reporting 49,946 people served. The largest is City of Nogales, which reports serving 22,000 people. 17 are community water systems serving people where they live; the other 20 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
37
Population served
49.9K
Community systems
17
Groundwater share
100%
How does Santa Cruz County compare with other Arizona counties?
Santa Cruz County has the 13th-most active public water systems among the 56 counties listed for active Arizona systems in EPA records; among the 19 with 3 or more systems, the median has 63. Its systems report 49,946 people served in total, the 11th-largest county figure in the state and 0.6% of the statewide total. The average system here reports serving 1,350 people, well below the Arizona average of 4,369. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Santa Cruz County's drinking water come from?
By primary water source, Santa Cruz County's active systems draw on groundwater (37, 100%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 95% and 4.7% across Arizona. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, City of Nogales, draws primarily on groundwater.
What kinds of water systems operate in Santa Cruz County?
Santa Cruz County's active systems break down as 17 community systems (46%), 4 non-transient non-community systems (11%) and 16 transient non-community systems (43%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as public/private partnership (35%), private (32%), local government (16%) and federal government (11%).
Water systems in Santa Cruz County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Nogales City of | Santa Cruz | 22,000 | Community | Groundwater |
| 2 | Liberty Water Rio Rico | Santa Cruz | 17,960 | Community | Groundwater |
| 3 | Valle Verde Water Company - East | Santa Cruz | 2,331 | Community | Groundwater |
| 4 | Epcor - Tubac | Santa Cruz | 2,076 | Community | Groundwater |
| 5 | Baca Float Water Company | Santa Cruz | 1,090 | Community | Groundwater |
| 6 | Patagonia Water Department | Santa Cruz | 819 | Community | Groundwater |
| 7 | Az State Pks Patagonia Lake | Santa Cruz | 564 | Transient non-community | Groundwater |
| 8 | Town & Country - Preston | Santa Cruz | 430 | Community | Groundwater |
| 9 | Santa Cruz County Fairgrounds | Santa Cruz | 297 | Transient non-community | Groundwater |
| 10 | De Anza Trail Rv | Santa Cruz | 200 | Transient non-community | Groundwater |
| 11 | Tumacacori National Historic Park | Santa Cruz | 170 | Transient non-community | Groundwater |
| 12 | Sonoita Valley (South) Water Company | Santa Cruz | 169 | Community | Groundwater |
| 13 | The Grand Acres | Santa Cruz | 153 | Community | Groundwater |
| 14 | Elgin School | Santa Cruz | 150 | Non-transient non-community | Groundwater |
| 15 | Sonoita Mercantile Water System | Santa Cruz | 125 | Transient non-community | Groundwater |
| 16 | Ac'S Truck Stop | Santa Cruz | 110 | Transient non-community | Groundwater |
| 17 | Kino Ranch 2 | Santa Cruz | 109 | Community | Groundwater |
| 18 | Gen Properties LLC | Santa Cruz | 100 | Transient non-community | Groundwater |
| 19 | Adot Border Patrol | Santa Cruz | 100 | Non-transient non-community | Groundwater |
| 20 | Wisdom Cafe | Santa Cruz | 100 | Transient non-community | Groundwater |
| 21 | Avalon Gardens Water System | Santa Cruz | 100 | Community | Groundwater |
| 22 | Parcel 1 Water | Santa Cruz | 100 | Transient non-community | Groundwater |
| 23 | Mountain View Rv Ranch | Santa Cruz | 100 | Community | Groundwater |
| 24 | Cs Santa Cruz Water Co | Santa Cruz | 82 | Community | Groundwater |
| 25 | Trujillo Trail Dwid | Santa Cruz | 75 | Community | Groundwater |
| 26 | Valle Verde Water Company - West | Santa Cruz | 74 | Non-transient non-community | Groundwater |
| 27 | Crisantes Greenhouse Water System | Santa Cruz | 60 | Non-transient non-community | Groundwater |
| 28 | Sonoita Valley (North) Water Company | Santa Cruz | 49 | Community | Groundwater |
| 29 | Smithsonian Inst Ii | Santa Cruz | 35 | Transient non-community | Groundwater |
| 30 | Usfs Cnf Bog Springs | Santa Cruz | 35 | Transient non-community | Groundwater |
| 31 | Sonoita Springs Water Company | Santa Cruz | 30 | Transient non-community | Groundwater |
| 32 | Patagonia Rv Park | Santa Cruz | 28 | Transient non-community | Groundwater |
| 33 | Casas Arroyo Association Inc. | Santa Cruz | 27 | Community | Groundwater |
| 34 | Patagonia Sonoita Creek Preserve | Santa Cruz | 25 | Transient non-community | Groundwater |
| 35 | Usfs-Cnf Nogales Admin | Santa Cruz | 25 | Transient non-community | Groundwater |
| 36 | Old Tumacacori Bar | Santa Cruz | 25 | Transient non-community | Groundwater |
| 37 | Red Rock Acres Hoa | Santa Cruz | 23 | Community | Groundwater |
Santa Cruz County water systems: frequently asked questions
How many public water systems are in Santa Cruz County, Arizona?
EPA's SDWIS records file 37 active public water systems under Santa Cruz County, Arizona: 17 community systems (46%), 4 non-transient non-community systems (11%) and 16 transient non-community systems (43%).
Who supplies drinking water in Santa Cruz County, AZ?
The largest community water systems filed under Santa Cruz County are City of Nogales (22,000 people served), Liberty Water Rio Rico (17,960 people served) and Valle Verde Water Company - East (2,331 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Santa Cruz County's drinking water come from groundwater or surface water?
Of the 37 active public water systems in Santa Cruz County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, City of Nogales, uses groundwater.
Where can I find a water quality report for Santa Cruz County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 17 community systems are filed under Santa Cruz County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Santa Cruz County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More Arizona water systems
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Santa Cruz County, Arizona”, https://aquacensus.com/water-systems/arizona/santa-cruz (data as of October 1, 2026).