The Power of Information

National Drinking Water Database


Alpha particle activity (excl radon and uranium) in South Dakota


Alpha particles are a form of radiation associated with radioactive mining waste pollutants and natural sources. [read more]

The Most Polluted Communities in South Dakota

97 water utilities reported detecting Alpha particle activity (excl radon and uranium) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Alpha particle activity (excl radon and uranium) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Shirt Tail Gulch Development
Deadwood, SD
554 of 421.18 pCi/L
(17.8 to 22.6 pCi/L)
2Edgemont
Edgemont, SD
8674 of 419.29 pCi/L
(17.55 to 21.9 pCi/L)
3Midland
Midland, SD
1804 of 418.9 pCi/L
(11.9 to 26 pCi/L)
4New Underwood
New Underwood, SD
6164 of 418.28 pCi/L
(11.1 to 22.8 pCi/L)
5Rainbow Water Company
Piedmont, SD
1624 of 417.9 pCi/L
(11.7 to 23.3 pCi/L)
6Colonial Pine Hills
Rapid City, SD
1,2604 of 415.2 pCi/L
(7.9 to 28.3 pCi/L)
7Buffalo Gap
Buffalo Gap, SD
1641 of 114.6 pCi/L
(14.6 pCi/L)
8Sunset Ranch
SD
1101 of 114 pCi/L
(14 pCi/L)
9Saint Onge Sewer & Water Co
St Onge, SD
2551 of 113.9 pCi/L
(13.9 pCi/L)
10Corson Village Sanitary District
Corson, SD
503 of 313.8 pCi/L
(10.9 to 16 pCi/L)

Health Based Limits for Alpha particle activity (excl radon and uranium)

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 pCi/L
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.0.15 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.15 pCi/L
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.15 pCi/L

Violation Summary for Alpha particle activity (excl radon and uranium) in South Dakota

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

Violation TypeNumber of Violations
Over maximum contaminant level, Average34
Failure to monitor regularly8