Chlorine (MRDL) violations in Arizona
274 active public water systems in Arizona had a Chlorine (MRDL) violation in the past three years, 24 of them in the latest quarter of EPA's data. What Chlorine (MRDL) is and why it matters.
Systems with a Chlorine (MRDL) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Navajo County Public Works Complex Holbrook · Navajo County |
86 | 5 | 1 | |
|
Sweet Springs Mobile Home Park St David · Cochise County |
85 | 1 | 0 | |
|
Triple G Dairy Buckeye · Maricopa County |
84 | 2 | 0 | |
|
Kinlichee Staff Housing Bia Kinlichee · County |
80 | 5 | 1 | |
|
Usfs Knf Tusayan Admin Tusayan · Coconino County |
80 | 6 | 1 | |
|
Arizona Proving Ground Wittmann · Maricopa County |
75 | 5 | 1 | |
|
Beaver Dam WC System 3 Littlefield · Mohave County |
75 | 5 | 0 | |
|
Valle Verde Water Company West Nogales · Santa Cruz County |
74 | 3 | 0 | |
|
Bonita Creek Water Company Payson · Gila County |
67 | 9 | 1 | |
|
Double Adobe School Double Adobe · Cochise County |
63 | 6 | 1 | |
|
Crisantes Greenhouse Water System Amado · Santa Cruz County |
60 | 6 | 1 | |
|
Montezuma Heights Water Camp Verde · Yavapai County |
60 | 2 | 0 | |
|
Katherine Resorts Water Company Bullhead City · Mohave County |
58 | 7 | 0 | |
|
Red Rock (red Valley) Day School Bia Red Valley · County |
55 | 4 | 2 | |
|
Parker South Parker · La Paz County |
45 | 3 | 0 | |
|
CS Old Concho Water Users Concho · Apache County |
40 | 7 | 0 | |
|
Pinyon Plain Mine Coconino County |
35 | 3 | 0 | |
|
Sasabe Border Village Sasabe · Pima County |
31 | 5 | 1 | |
|
Jakes Corner RV Park Payson · Gila County |
30 | 5 | 2 | |
|
Aps Yucca Water Yuma · Yuma County |
27 | 1 | 0 | |
|
Jacob Lake Lodge Jacob Lake · Coconino County |
27 | 3 | 0 | |
|
Navajo National Monument Shonto · County |
25 | 2 | 0 | |
|
Twin Arrows Ntua Twin Arrows · County |
25 | 3 | 2 | |
|
Asarco Hayden Smelter Hayden · Gila County |
24 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Chlorine (MRDL), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Chlorine (MRDL) alone.
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.