Arizona

Cochise County drinking water quality

105 active public water systems serve 130,495 people in Cochise County. 19 are compliant, 86 had at least one EPA violation in the past three years, 7 are designated serious violators, and 7 carry a health flag.

Active systems 105 53 community systems

People served 130K by public water systems

Systems with violations 86 82% of active systems, past 3 years

Serious violators 7 7 systems carry a health flag

Needs attention

Pomerene Dwid AZ0402012 · Pomerene · Community water system · Serves 1,618 5 rules violated in the past three years

Tombstone City of AZ0402033 · Tombstone · Community water system · Serves 1,545 4 rules violated in the past three years. Unresolved: Public Notice Rule and Revised PN Rule.

San Simon Dwid AZ0402027 · San Simon · Community water system · Serves 312 6 rules violated in the past three years. Unresolved: Public Notice Rule and Revised PN Rule and Consumer Confidence Rule.

Western Refining Speedway 2962 AZ0402128 · Sierra Vista · Transient non-community system · Serves 162 2 rules violated in the past three years. Unresolved: Revised Total Coliform Rule and Public Notice Rule and Revised PN Rule.

Double Adobe School AZ0402076 · Double Adobe · Non-Transient non-community system · Serves 63 6 rules violated in the past three years. Unresolved: Public Notice Rule and Revised PN Rule.

The Brite Spot AZ0402392 · Palominas · Transient non-community system · Serves 57 2 rules violated in the past three years. Unresolved: Revised Total Coliform Rule and Public Notice Rule and Revised PN Rule.

Tombstone Investors, LLC AZ0402413 · Tombstone · Transient non-community system · Serves 50 3 rules violated in the past three years. Unresolved: Revised Total Coliform Rule and Public Notice Rule and Revised PN Rule.

Naco Water CO Main AZ0402024 · Naco · Community water system · Serves 658 1 rule violated in the past three years. Unresolved: Revised Total Coliform Rule.

Coronado Elementary AZ0402102 · Coranado School · Non-Transient non-community system · Serves 446 1 rule violated in the past three years. Unresolved: Revised Total Coliform Rule.

Monte Vista Water Company AZ0402043 · Douglas · Community water system · Serves 150 8 rules violated in the past three years. Unresolved: Revised Total Coliform Rule.

1 more systems with a serious violator or health flag designation are in the lists below.

Community water systems

53 systems, largest first

System	Serves	Rules violated, 3 yr	Unresolved
Bella Vista City Water System Sierra Vista	20,045	1	0
Douglas City of Douglas	16,656	2	0
US Army Fort Huachuca Fort Huachuca	15,603	2	0
Pueblo del Sol Water Company Sierra Vista	12,804	4	0
Arizona Water CO Sierra Vista Sierra Vista	9,233	1	0
Arizona Water CO Bisbee Bisbee	8,590	2	0
Benson, City of Water System Benson	5,355	3	1
City of Willcox Willcox	3,236	6	0
ST David Dwid St David	2,192	4	0
Bella Vista Water South Sierra Vista	2,178	1	1
East Slope Water Company Sierra Vista	2,012	0	0
Town of Huachuca City Huachuca City	1,750	5	0
Bisbee Douglas Intl Airport Bisbee	1,700	3	1
Southland Utilities Golden Acres Sierra Vista	1,635	1	0
Pomerene Dwid Pomerene	1,618	5	0
Southern Sunrise WC Cochise Horseshoe Sierra Vista	1,588	0	0
Tombstone City of Tombstone	1,545	4	1
Mescal Lakes Water System Benson	1,398	2	1
Clear Springs Utility Main Sunsites	1,385	2	1
Whetstone Dwid Huachuca City	940	1	0
Elfrida Wid Elfrida	800	6	0
Naco Water CO Main Naco	658	1	1
East Slope Water West Sierra Vista	655	0	0
Southern Sunrise WC Miracle Valley Bisbee	620	0	0
Northern Sunrise WC Coronado Tombstone	553	0	0
Bowie Wid Bowie	453	3	0
CS Winchester Water Company Willcox	402	3	0
Whetstone Ranch Water System Benson	398	4	0
CS Holiday Water Company Tombstone	395	3	0
Sierra Vista MH Village Sierra Vista	328	3	0
Northern Sunrise WC Mustang Crystal Sierra Vista	315	0	0
San Simon Dwid San Simon	312	6	2
Dragoon Water Company Dragoon	286	1	1
Willow Lakes Property Owners Assoc Benson	190	5	1
Monte Vista Water Company Douglas	150	8	1
Cloud Nine Water Company Sierra Vista	143	1	0
Naco Water CO Bisbee Bisbee	138	1	1
CS Sunizona Water Company Sunizona	136	2	1
Empirita Water Company Benson	120	3	0
Stratman Water Company St David	105	4	0
Sweet Springs Mobile Home Park St David	85	1	0
Cochise College Park Water Assoc Douglas	83	0	0
Twin Buttes Rv, LLC Douglas	79	4	1
Naco Estates Naco	75	5	1
Sulger Water Company 2 Sierra Vista	67	1	0
McNeal Water Company Mcneal	66	6	0
Ashley Rose MHP Huachuca City	50	3	0
Whetstone Village MHP Unknown	50	1	0
Clear Springs Utility Well 6 Pearce	48	1	1
Ntm Aviation Mcneal	47	4	0

Non-community systems (52: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

System	Serves	Rules violated, 3 yr	Unresolved
Adot San Simon Rest Area San Simon	2,500	0	0
Cochise County Community College Distric Douglas	1,120	0	0
Adot Texas Canyon Rest Area Texas Canyon	1,006	0	0
Apple Annies Orchard Willcox	675	3	1
Aspb Kartchner Caverns Benson	483	3	0
Douglas Border Patrol Station Douglas	450	3	0
Coronado Elementary Coranado School	446	1	1
Palominas Elementary Palominas	421	3	0
Fiesta Canning CO INC Mcneal	300	1	0
Valley View Elementary Hereford	231	2	0
Chiricahua Natl Monument Bonita CG Willcox	200	1	0
Fort Bowie National Historic Site Bowie	200	1	0
Mountain View RV Park Huachuca City	200	0	0
Adot San Simon Port of Entry San Simon	175	0	0
Western Refining Speedway 2962 Sierra Vista	162	2	2
Quail Ridge RV Park Fairbank	144	1	0
The Pharm Willcox	140	3	0
Amerind Foundation Dragoon	135	1	0
Coronado Memorial Sierra Vista	135	2	0
Benson Arizona KOA Kampground Benson	120	0	0
Cochise Elementary School Willcox	105	1	0
AZ Electric Power Apache Willcox	100	2	0
Bowie Travel Center Bowie	100	1	0
Pearce Elementary School Pearce	100	3	0
Valley Union High School Elfrida	100	4	0
Red Barn Campground Benson	98	0	0
Usfs Cnf Cave Creek Portal	90	0	0
Double Adobe RV Park Double Adobe	82	1	0
Apache Nitrogen Products St David	70	0	0
Double Adobe School Double Adobe	63	6	1
Desert Oasis Campground Mcneal	60	3	0
Blm San Pedro House Sierra Vista	58	4	0
Johnson Camp Mine Water Dragoon	58	1	0
The Brite Spot Palominas	57	2	2
Holy Trinity Monastery St David	55	0	0
Parker Lakeview Estates Parker Canyon Lake	54	2	0
Ash Creek Elementary School Sunizona	50	3	0
Dairy Queen Sierra Vista	50	1	0
Fort Willcox RV Park Willcox	50	2	0
Morning Star Cafe Hereford	50	1	0
Sierra Vista Airport Sierra Vista	50	1	1
Tombstone Investors, LLC Tombstone	50	3	2
Tombstone Territories RV Huachuca City	45	1	1
Usfs Cnf Douglas Ranger Station Douglas	45	2	0
Portal Store Portal	40	1	0
Southwestern Research Station Portal	40	3	0
McNeal Elementary School Mcneal	38	3	0
High Low RV Park Benson	30	0	0
Usfs Cnf Lake View Parker	30	1	0
Chevron Freeway Willcox	25	1	0
The Nature Conservancy Ramsey Canyon	25	1	1
Diamond Mountain Retreat Bowie	23	1	1

Inactive systems (83, 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. Retrieved from ECHO on Oct 11, 2026.

Cochise County drinking water quality

Needs attention

Community water systems

Compliant

Violations in the past 3 years

Serious violator

Health flag

Inactive system