The Power of Information

National Drinking Water Database

Combined Radium (-226 & -228) in New Hampshire

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

The Most Polluted Communities in New Hampshire

338 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
1Amazon Park
Rochester, NH
1108 of 811.93 pCi/L
(7.01 to 14.65 pCi/L)
2Shadow Lake Mobile Home Park
Salem, NH
5812 of 125.73 pCi/L
(1.1 to 9.1 pCi/L)
3Danville Four Seasons
Danville, NH
1296 of 65.67 pCi/L
(3.3 to 12.5 pCi/L)
4Silver Bell Mobile Home Park
Rochester, NH
537 of 75.62 pCi/L
(1.2 to 14.62 pCi/L)
5Thornton Central School
2801 of 15.4 pCi/L
(5.4 pCi/L)
6Barton Mobile Home Park
East Kingston, NH
368 of 85.33 pCi/L
(1.1 to 8.3 pCi/L)
7Grappone Honda
401 of 15 pCi/L
(5 pCi/L)
8Boumil Grove Condos
Londonderry, NH
7511 of 114.28 pCi/L
(1.5 to 14.2 pCi/L)
9Dockham Shores Estates
Gilford, NH
1451 of 14.15 pCi/L
(4.15 pCi/L)
10Chandler Terrace
Plaistow, NH
307 of 74.11 pCi/L
(2.2 to 8 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 New Hampshire

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

Violation TypeNumber of Violations
Over maximum contaminant level, Average32
Failure to monitor regularly27