The Power of Information

National Drinking Water Database

Combined Radium (-226 & -228) in Iowa

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

The Most Polluted Communities in Iowa

324 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
1Lacina Meadows Residential Subdivision
Iowa City, IA
3810 of 108.87 pCi/L
(3.7 to 11 pCi/L)
2Bayard Water Supply
Bayard, IA
53610 of 105.88 pCi/L
(3.28 to 8.2 pCi/L)
3Iowa City Regency Mobile Home Community
North Libe, IA
7008 of 95.77 pCi/L
(0 to 9.2 pCi/L)
4South High Point Well Assn 2
Iowa City, IA
265 of 55.76 pCi/L
(5.1 to 6.2 pCi/L)
5Conroy Water Supply
Conroy, IA
3206 of 65.43 pCi/L
(3.6 to 5.8 pCi/L)
6Pershing Utilities Corp
Knoxville, IA
4852 of 25.4 pCi/L
(5.1 to 5.7 pCi/L)
7Woodland Ridge Subdivision
Iowa City, IA
501 of 15.4 pCi/L
(5.4 pCi/L)
8Pleasant Creek Estates - Palo
Fairfax, IA
459 of 95.33 pCi/L
(3.9 to 6.3 pCi/L)
9Lehigh Water Supply
Lehigh, IA
49710 of 105.28 pCi/L
(1.3 to 11.2 pCi/L)
10Hartford Water Works
Hartford, IA
7595 of 55.2 pCi/L
(4.6 to 5.5 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 Iowa

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

Violation TypeNumber of Violations
Over maximum contaminant level, Average53
Failure to monitor regularly15
Over maximum contaminant level, Single Sample2
Failure to monitor: Check/Repeat/Confirmation sampling2