Surface Water Treatment Rule (SWTR) violations in Arizona
45 active public water systems in Arizona had a Surface Water Treatment Rule (SWTR) violation in the past three years, 9 of them in the latest quarter of EPA's data. What Surface Water Treatment Rule (SWTR) is and why it matters.
Systems with a Surface Water Treatment Rule (SWTR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Ak-Chin Village Ak-chin Village · County |
11,646 | 6 | 1 | |
|
Williams City of Williams · Coconino County |
3,145 | 7 | 1 | |
|
Tacna Water Improvement District Tacna · Yuma County |
500 | 3 | 0 | |
|
Camp Navajo Bellemont · Coconino County |
350 | 4 | 1 | |
|
Tonto Hills Dwid Tonto Hills · Maricopa County |
350 | 4 | 1 | |
|
AZ State Parks Cattail Cove Lake Havasu City · Mohave County |
170 | 4 | 0 | |
|
Kohls Ranch Water Company Kohls Ranch · Gila County |
141 | 9 | 2 | |
|
Destination at Oak Creek Oak Creek Canyon · Coconino County |
50 | 4 | 2 | |
|
Government Hill Water System Roosevelt · Gila County |
50 | 3 | 0 | |
|
Phoenix City of Phoenix · Maricopa County |
1,695,000 | 2 | 0 | |
|
Gilbert, Town of Gilbert · Maricopa County |
247,600 | 9 | 1 | |
|
Glendale City of Glendale · Maricopa County |
234,766 | 3 | 0 | |
|
Epcor Agua Fria Surprise · Maricopa County |
128,040 | 5 | 0 | |
|
Flagstaff City of Flagstaff · Coconino County |
79,796 | 5 | 0 | |
|
Goodyear Water Department Goodyear · Maricopa County |
50,001 | 4 | 0 | |
|
Epcor Chaparral City Fountain Hills · Maricopa County |
26,026 | 2 | 0 | |
|
Epcor Anthem Anthem · Maricopa County |
23,826 | 3 | 0 | |
|
Apache Junction Water District Apache Junction · Pinal County |
15,610 | 6 | 0 | |
|
Wmatua Miner Flat County |
15,570 | 6 | 1 | |
|
Epcor Paradise Valley/scottsdale Paradise Valley · Maricopa County |
14,107 | 2 | 0 | |
|
Tolleson City of Tolleson · Maricopa County |
9,300 | 4 | 0 | |
|
Usaf Luke Air Force Base Litchfield Park · Maricopa County |
8,440 | 2 | 0 | |
|
Page City of Page · Coconino County |
7,445 | 3 | 1 | |
|
Morenci Water Elec CO Main Morenci · Greenlee County |
4,078 | 5 | 0 | |
|
Carefree Water Company Carefree · Maricopa County |
3,588 | 3 | 0 | |
|
Scua Bylas Bylas · County |
3,160 | 12 | 3 | |
|
Wellton Town of Wellton · Yuma County |
3,000 | 10 | 1 | |
|
Sheraton Phoenix Downtown Morristown · Maricopa County |
1,804 | 4 | 1 | |
|
Tombstone City of Tombstone · Cochise County |
1,545 | 4 | 1 | |
|
AZ State Parks Slide Rock Oak Creek Canyon · Coconino County |
1,500 | 2 | 0 | |
|
Fredonia Town of Fredonia · Coconino County |
1,327 | 5 | 1 | |
|
Katherine Landing Dwtp Katherine Landing · Mohave County |
1,300 | 5 | 0 | |
|
Gcnra Lees Ferry Lees Ferry · Coconino County |
890 | 5 | 1 | |
|
Young Life Lost Canyon Campground Williams · Coconino County |
600 | 1 | 0 | |
|
Saguaro Lake Marina Saguaro Lake · Maricopa County |
450 | 2 | 0 | |
|
Hidden Shores RV Village Imperial Dam · Yuma County |
324 | 3 | 0 | |
|
Antelope Union High School Yuma · Yuma County |
250 | 8 | 0 | |
|
CS Mohawk Utility Company Tacna · Yuma County |
243 | 8 | 0 | |
|
Rim Trail Dwid Payson · Gila County |
200 | 9 | 3 | |
|
Cibola Water Improvement District Cibola · La Paz County |
197 | 8 | 2 | |
|
Mohawk Valley School District Roll · Yuma County |
171 | 7 | 0 | |
|
Apache Lake Marina Resort Apache Lake · Maricopa County |
123 | 5 | 0 | |
|
Lake Roosevelt Water Plant Roosevelt · Gila County |
100 | 4 | 1 | |
|
Pine Water Association Dwid Pine · Gila County |
100 | 7 | 5 | |
|
Bonita Creek Water Company Payson · Gila County |
67 | 9 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Surface Water Treatment Rule (SWTR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Surface Water Treatment Rule (SWTR) 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.