Arizona

Pima County drinking water quality

193 active public water systems serve 1,136,697 people in Pima County. 66 are compliant, 127 had at least one EPA violation in the past three years, 2 are designated serious violators, and 5 carry a health flag.

Active systems 193 142 community systems

People served 1.1M by public water systems

Systems with violations 127 66% of active systems, past 3 years

Serious violators 2 5 systems carry a health flag

Needs attention

Rancho Sierrita Well Assoc AZ0410286 · Tucson · Community water system · Serves 51 3 rules violated in the past three years. Unresolved: Revised Total Coliform Rule and Lead and Copper Rule.

Siete Casas Joint Venture AZ0410242 · Tucson · Community water system · Serves 25 2 rules violated in the past three years. Unresolved: Revised Total Coliform Rule and Public Notice Rule and Revised PN Rule.

Marana Dwid Culver AZ0410070 · Marana · Community water system · Serves 709 4 rules violated in the past three years. Unresolved: Ground Water Rule.

Tucson Racquet & Fitness Club AZ0410222 · Tucson · Non-Transient non-community system · Serves 330 3 rules violated in the past three years. Unresolved: Revised Total Coliform Rule.

Calportland Rillito Cement Plant AZ0420011 · Rillito · Non-Transient non-community system · Serves 184 4 rules violated in the past three years. Unresolved: Revised Total Coliform Rule and Lead and Copper Rule.

Community water systems

142 systems, largest first

System	Serves	Rules violated, 3 yr	Unresolved
Halcyon Acres 2 Tucson	144	0	0
Orchard Valley Mobile Home Park Catalina	130	3	0
Marana Municipal Palo Verde Marana	128	0	0
Rancho Tierra Blanca Poa Marana	126	0	0
Mobile Home Properties Sahuarita	114	3	1
Catalina Village Tucson	107	3	1
GW Saguaro Dist Water CO Lyn Lee Marana	106	0	0
Thim Utility Company Rancho Vista Tucson	105	1	0
Crossroads Park MHP Tucson	100	1	1
Kahlua Well Coop Vail	99	0	0
GW Saguaro Dist Water CO Amber Ann Three Points	93	1	1
Sahuarita Village Water Company Sahuarita	93	5	1
Desert Paradise MHP LLC Tubac	90	5	2
Wells Fargo Water Company Tucson	86	1	1
GW Ocotillo Water Sierrita Foothills Sahuarita	79	0	0
Catalina Country Estates Tucson	77	1	0
Metropolitan Dwid Lazy B Tucson	77	2	0
Lazy Acres MHP Sahuarita	75	1	1
Rincon Mesa Landowners Tucson	75	2	1
Riverside Apartments Tucson	75	3	1
Carolanne Drive HOA Tucson	72	2	0
High Chaparral Water Coop Tucson	72	1	0
Pocketknife Water Coop Vail	70	1	0
Thim Utility Company Parkin Tucson	69	2	0
Cammies Foothills Vista MHC Tucson	62	1	0
Worden Water Company Three Points	60	6	0
GW Saguaro Dist Water CO Tortolita Tucson	57	0	0
Pita Water Company Amado	54	2	0
Shae Water Company Amado	54	3	1
Summit Water Coop Tucson	53	0	0
Sierra Court MHC LLC Tucson	52	2	1
Wildcat One Well Coop Vail	52	2	0
Rancho Sierrita Well Assoc Tucson	51	3	2
Santa Rita Heights MHP Sahuarita	50	2	1
Pico Vista Community Well Tucson	49	1	1
Klafter Well Coop Tucson	45	1	0
Superstition Water Coop Vail	45	0	0
Garigans Gulch Water Coop Vail	35	0	0
Coronado Forest Drive Water Coop Catalina	34	3	1
Wilmot Water Users Group Tucson	30	0	0
Gator Water Company Tucson	29	1	1
Siete Casas Joint Venture Tucson	25	2	2

Non-community systems (51: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

System	Serves	Rules violated, 3 yr	Unresolved
University of Arizona Tucson	50,000	0	0
Tucson Medical Center Tucson	3,000	4	1
UA Tech Park Rita Road Tucson	3,000	2	0
Marana High School Marana	2,450	1	0
Marana Estes Elementary School Marana	2,000	1	0
Vail School District Elementary School Vail	1,680	3	0
Saguaro National Park Tucson	1,440	2	0
Salpointe Catholic High School Tucson	1,300	0	0
Tucson Country Day School Tucson	800	0	0
Asarco Mission Unit Green Valley	586	0	0
Usfs Cnf Sabino Canyon Stop 8 Sabino Canyon	550	0	0
Thim Utility Corporation VFW Three Points	413	0	0
Usfs Cnf Loma Linda Mount Lemmon	350	1	0
Usfs Cnf Ski Lodge Mount Lemmon	350	0	0
AZ State Parks Catalina Mountain Catalina	330	1	0
Tucson Racquet & Fitness Club Tucson	330	3	1
Camp Whispering Pines Mount Lemon	240	0	0
Saint Phillips Plaza Tucson	220	2	0
Santa Catalina Catholic Church Tucson	212	2	0
Pcnr Colossal Cave Tucson	210	1	0
Camp Lawton Mount Lemmon	200	2	0
Caterpillar INC Green Valley	200	0	0
Latter Day Saints Church Summerhaven	200	4	1
Silverbell Mining, LLC Marana	200	3	0
Calportland Rillito Cement Plant Rillito	184	4	2
Greenfields Country Day School Tucson	163	6	0
Bayer R&d Services LLC Marana Marana	160	2	0
Caballo Loco Ranch Sasabe	150	3	1
Pcnr Gilbert Ray Tmp Tucson	150	2	0
Tanque Verde Guest Ranch Tucson	150	2	0
Lil Abners Steakhouse Tucson	100	0	0
Pcnr Motor Sports Tucson	100	0	0
Pcnr Picture Rocks Tucson	100	1	0
Hot Rod Water Vail	90	3	0
Pcnr Fairgrounds Tucson	87	0	0
Tucson Ready Mix Orange Grove Tucson	80	0	0
Campbell Avenue Farms Tucson	65	0	0
White Stallion Guest Ranch Tucson	60	1	0
Marana Municipal Airport Marana	55	0	0
Buenos Aires National Wildlife Refuge Sasabe	54	7	1
Pcnr Three Point Three Points	52	2	0
Sopori School Park Tucson	50	0	0
Lukeville Border Station Lukeville	45	1	0
Elkhorn Ranch Sasabe	40	1	0
Hitda Training Center Tucson	35	0	0
Sasabe Border Village Sasabe	31	5	1
Soldier Camp Permittees Summerhaven	30	3	0
EL Mesquital Guest Ranch Tucson	25	0	0
Gringo Pass TP Lukeville	25	1	0
Pcnr la Posta Quemada Tucson	25	0	0
Redwood Lodge Tucson	25	1	0

Inactive systems (322, 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.

Pima County drinking water quality

Needs attention

Community water systems

Compliant

Violations in the past 3 years

Serious violator

Health flag

Inactive system