The Power of Information

National Drinking Water Database

Combined Radium (-226 & -228) in Arizona

Radium is a radioactive element usually found around uranium deposits. [read more]

The Most Polluted Communities in Arizona

24 water utilities reported detecting Combined Radium (-226 & -228) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Combined Radium (-226 & -228) level

RankSystem Population Served Positive test results of total reported tests Average Level
1Aspc Apache
Winslow, AZ
3351 of 13.4 pCi/L
(3.4 pCi/L)
2City of Holbrook
Holbrook, AZ
5,0003 of 41.28 pCi/L
(0 to 1.9 pCi/L)
3Winchester Trails
Showlow, AZ
2501 of 21.05 pCi/L
(0 to 2.1 pCi/L)
4Ponderosa Park Water Impr
Prescott, AZ
5003 of 51.02 pCi/L
(0 to 2.3 pCi/L)
5A Petersen Water Co
Clay Springs, AZ
702 of 21 pCi/L
(0.4 to 1.6 pCi/L)
6Sherman Pines Water Co
Prescott, AZ
902 of 30.93 pCi/L
(0 to 1.8 pCi/L)
7City of Tempe
Tempe, AZ
160,0002 of 20.75 pCi/L
(0.3 to 1.2 pCi/L)
8Sweetwater Ranch
1801 of 10.5 pCi/L
(0.5 pCi/L)
9City of Lake Havasu
Lake Havasu City, AZ
43,0002 of 20.36 pCi/L
(0.09 to 0.62 pCi/L)
10Los Cerros Wc, Inc.
Tucson, AZ
2,0371 of 20.25 pCi/L
(0 to 0.5 pCi/L)

Health Based Limits for Combined Radium (-226 & -228)

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 pCi/L
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.5 pCi/L

Violation Summary for Combined Radium (-226 & -228) 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 regularly116