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National Drinking Water Database


Arsenic (total) in Arizona


Arsenic contaminates drinking water due to mining runoff, erosion of natural deposits, emissions from glass and electronics processing and the use of arsenical compounds as wood preservatives and pesticides. [read more]

The Most Polluted Communities in Arizona

501 water utilities reported detecting Arsenic (total) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Arsenic (total) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Tacna Water Co
Yuma, AZ
2401 of 130 ppb
(30 ppb)
2Montezuma Rimrock Wc, Llc
Rim Rock, AZ
4561 of 128 ppb
(28 ppb)
3Humboldt Water System
Sedona, AZ
6001 of 127 ppb
(27 ppb)
4Little Park Water Co
Sedona, AZ
1612 of 226.5 ppb
(26 to 27 ppb)
5Usmc-Air Station-Main
Yuma, AZ
6,3241 of 126 ppb
(26 ppb)
6Camp Verde Water Sys-Ver
Camp Verde, AZ
1201 of 126 ppb
(26 ppb)
7City of Apache Junction
Apache Jinction, AZ
12,0639 of 1025.8 ppb
(0 to 30 ppb)
8Cordes Lake-Verde Vi
Tempe, AZ
2,3001 of 125.8 ppb
(25.8 ppb)
9Abra Wc
Paulden, AZ
1,3111 of 125.5 ppb
(25.5 ppb)
10Verde Lakes Wtr-Stillwater
Camp Verde, AZ
6801 of 125 ppb
(25 ppb)

Health Based Limits for Arsenic (total)

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.0 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.<0.01 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.0.02 ppb
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.0.02 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.2 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.10 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.10 ppb

Violation Summary for Arsenic (total) in Arizona

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Arizona since 2004

Violation TypeNumber of Violations
Failure to monitor regularly242
Over maximum contaminant level, Average165
Over maximum contaminant level, Single Sample45