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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

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Active public water systems in Santa Cruz County, Arizona
#Water systemCountyPopulation servedTypeSource
1Nogales City ofSanta Cruz22,000CommunityGroundwater
2Liberty Water Rio RicoSanta Cruz17,960CommunityGroundwater
3Valle Verde Water Company - EastSanta Cruz2,331CommunityGroundwater
4Epcor - TubacSanta Cruz2,076CommunityGroundwater
5Baca Float Water CompanySanta Cruz1,090CommunityGroundwater
6Patagonia Water DepartmentSanta Cruz819CommunityGroundwater
7Az State Pks Patagonia LakeSanta Cruz564Transient non-communityGroundwater
8Town & Country - PrestonSanta Cruz430CommunityGroundwater
9Santa Cruz County FairgroundsSanta Cruz297Transient non-communityGroundwater
10De Anza Trail RvSanta Cruz200Transient non-communityGroundwater
11Tumacacori National Historic ParkSanta Cruz170Transient non-communityGroundwater
12Sonoita Valley (South) Water CompanySanta Cruz169CommunityGroundwater
13The Grand AcresSanta Cruz153CommunityGroundwater
14Elgin SchoolSanta Cruz150Non-transient non-communityGroundwater
15Sonoita Mercantile Water SystemSanta Cruz125Transient non-communityGroundwater
16Ac'S Truck StopSanta Cruz110Transient non-communityGroundwater
17Kino Ranch 2Santa Cruz109CommunityGroundwater
18Gen Properties LLCSanta Cruz100Transient non-communityGroundwater
19Adot Border PatrolSanta Cruz100Non-transient non-communityGroundwater
20Wisdom CafeSanta Cruz100Transient non-communityGroundwater
21Avalon Gardens Water SystemSanta Cruz100CommunityGroundwater
22Parcel 1 WaterSanta Cruz100Transient non-communityGroundwater
23Mountain View Rv RanchSanta Cruz100CommunityGroundwater
24Cs Santa Cruz Water CoSanta Cruz82CommunityGroundwater
25Trujillo Trail DwidSanta Cruz75CommunityGroundwater
26Valle Verde Water Company - WestSanta Cruz74Non-transient non-communityGroundwater
27Crisantes Greenhouse Water SystemSanta Cruz60Non-transient non-communityGroundwater
28Sonoita Valley (North) Water CompanySanta Cruz49CommunityGroundwater
29Smithsonian Inst IiSanta Cruz35Transient non-communityGroundwater
30Usfs Cnf Bog SpringsSanta Cruz35Transient non-communityGroundwater
31Sonoita Springs Water CompanySanta Cruz30Transient non-communityGroundwater
32Patagonia Rv ParkSanta Cruz28Transient non-communityGroundwater
33Casas Arroyo Association Inc.Santa Cruz27CommunityGroundwater
34Patagonia Sonoita Creek PreserveSanta Cruz25Transient non-communityGroundwater
35Usfs-Cnf Nogales AdminSanta Cruz25Transient non-communityGroundwater
36Old Tumacacori BarSanta Cruz25Transient non-communityGroundwater
37Red Rock Acres HoaSanta Cruz23CommunityGroundwater

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).