The Power of Information

National Drinking Water Database

Alpha particle activity in Delaware

Alpha particles are a form of radiation released from mining waste pollutants and natural sources. [read more]

The Most Polluted Communities in Delaware

200 water utilities reported detecting Alpha particle activity 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 level

RankSystem Population Served Positive test results of total reported tests Average Level
1Sussex Manor Mobile Home Park
Laurel, DE
2791 of 18.42 pCi/L
(8.42 pCi/L)
2New Castle Water Department
New Castle, DE
6,0002 of 23.09 pCi/L
(0.17 to 6.02 pCi/L)
3Glen Acres
Seaford, DE
932 of 23.01 pCi/L
(1.98 to 4.05 pCi/L)
4Pinnacle Rehabilitation & Health Center
Smyrna, DE
2564 of 42.8 pCi/L
(2.2 to 3.27 pCi/L)
5Woodland Trailer Court
Bear, DE
412 of 22.13 pCi/L
(1.98 to 2.27 pCi/L)
6Briarwood Manor Mhp
Pittsford, DE
2962 of 22.07 pCi/L
(0.66 to 3.48 pCi/L)
7Garrison Lake District
Dover, DE
6,4265 of 51.73 pCi/L
(0.63 to 3.12 pCi/L)
8Hedgerow Hollow Trailer Park
Smyrna, DE
1472 of 21.73 pCi/L
(1.05 to 2.4 pCi/L)
9Green Acres
Dover, DE
2134 of 41.64 pCi/L
(0.4 to 3.32 pCi/L)
10Smyrna Water Department
Smyrna, DE
10,0015 of 51.53 pCi/L
(0.18 to 5.49 pCi/L)

Health Based Limits for Alpha particle activity

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.15 pCi/L

Violation Summary for Alpha particle activity in Delaware

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

Violation TypeNumber of Violations
Failure to monitor regularly2