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.
Health effects: Acute high-dose exposure to chlorinated water can cause eye and nose irritation, stomach discomfort, and nausea. Chronic exposure above the MRDL is primarily a concern because elevated chlorine accelerates formation of trihalomethanes and haloacetic acids, which are associated with increased cancer risk over time.
Systems with a Chlorine (MRDL) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Antelope Union High School Yuma · Yuma County |
250 | 8 | 0 | |
|
LA Cholla Airpark Tucson · Pima County |
250 | 2 | 1 | |
|
Leupp Contract Boarding School Bia Leupp · County |
250 | 3 | 0 | |
|
Seba Dalkai Boarding School Bia Seba Dalkai · County |
250 | 4 | 2 | |
|
Yucca Water Association Yucca · Mohave County |
250 | 4 | 1 | |
|
CS Mohawk Utility Company Tacna · Yuma County |
243 | 8 | 0 | |
|
Arizonian RV Resort Apache Junction · Pinal County |
225 | 6 | 1 | |
|
Camp Mohave Bullhead City · Mohave County |
224 | 6 | 1 | |
|
Chinle Usd 24 Administration Center Chinle · County |
220 | 5 | 3 | |
|
Saint Phillips Plaza Tucson · Pima County |
220 | 2 | 0 | |
|
Wide Ruins Community Boarding School Bia Wide Ruins · County |
215 | 4 | 1 | |
|
New River School New River · Maricopa County |
211 | 4 | 2 | |
|
CS West Village Water Company Flagstaff · Coconino County |
210 | 7 | 0 | |
|
GW Saguaro Dist Water CO Rincon Tucson · Pima County |
209 | 3 | 0 | |
|
Picacho Elementary School District Picacho · Pinal County |
200 | 5 | 0 | |
|
Rim Trail Dwid Payson · Gila County |
200 | 9 | 3 | |
|
Silverbell Mining, LLC Marana · Pima County |
200 | 3 | 0 | |
|
Cibola Water Improvement District Cibola · La Paz County |
197 | 8 | 2 | |
|
Seven Canyons of Sedona Sedona · Yavapai County |
195 | 4 | 2 | |
|
Cottonwood Day School Bia Cottonwood · County |
185 | 3 | 0 | |
|
Snowbird RV Park Fort Mohave · Mohave County |
180 | 6 | 1 | |
|
The Oaks Mobile Home Park Superior · Pinal County |
180 | 2 | 0 | |
|
Kinlichee Community School Bia Kinlichee · County |
174 | 5 | 2 | |
|
Hunters Point Boarding School Bia Hunters Point · County |
173 | 7 | 1 | |
|
Mohawk Valley School District Roll · Yuma County |
171 | 7 | 0 | |
|
CS Lake Verde Water Company Camp Verde · Yavapai County |
169 | 4 | 0 | |
|
Rillito Water Users Assoc Rillito · Pima County |
165 | 4 | 2 | |
|
Beaver Dam WC System 2 Mesquite City · Mohave County |
162 | 5 | 0 | |
|
The Grand Acres Nogales · Santa Cruz County |
153 | 4 | 1 | |
|
Tanque Verde Guest Ranch Tucson · Pima County |
150 | 2 | 0 | |
|
Kohls Ranch Water Company Kohls Ranch · Gila County |
141 | 9 | 2 | |
|
American Ranch Dwid Prescott · Yavapai County |
140 | 5 | 0 | |
|
Chilchinbeto Community Day School Bia Chilchinbeto · County |
138 | 2 | 0 | |
|
Pine Springs Day School Bia Houck, North Of · County |
122 | 4 | 2 | |
|
Beverly Gardens Trailer Park Prescott · Yavapai County |
120 | 4 | 0 | |
|
Turquoise Triangle RV Park Cottonwood · Yavapai County |
120 | 3 | 0 | |
|
Verde Glen Dwid Payson · Gila County |
117 | 7 | 3 | |
|
Cienega Water Company INC Parker · La Paz County |
108 | 8 | 2 | |
|
Chino Valley Town Complex Chino Valley · Yavapai County |
107 | 3 | 0 | |
|
Adot Border Patrol Sonoita · Santa Cruz County |
100 | 5 | 0 | |
|
Beaver Creek Store Beaver Creek · Yavapai County |
100 | 5 | 3 | |
|
Bellemont Water Company Bellemont · Coconino County |
100 | 7 | 2 | |
|
Caballeros Water Company Wickenburg · Maricopa County |
100 | 3 | 0 | |
|
Central AZ College Aravaipa Winkelman · Pinal County |
100 | 3 | 1 | |
|
Usmc Air Station Cannon Complex Yuma · Yuma County |
100 | 3 | 0 | |
|
Signal Peak Water Company Coolidge · Pinal County |
99 | 4 | 0 | |
|
Sahuarita Village Water Company Sahuarita · Pima County |
93 | 5 | 1 | |
|
G & L Mobile Park Yuma · Yuma County |
90 | 6 | 1 | |
|
Rio Verde RV Park Cottonwood · Yavapai County |
90 | 2 | 1 | |
|
Hopeville Water System Buckeye · Maricopa County |
89 | 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.