National Drinking Water Database
Mallard Lakes - Nassau, DE
Serves 900 people - Test data available: 2004-2007
This drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group (EWG) by the Delaware Health and Social Services- Division of Public Health. It is part of EWG's national database that includes 47,667 drinking water utilities and 20 million test results. Water utilities nationwide detected more than 300 pollutants between 2004 and 2009. More than half of these chemicals are unregulated, legal in any amount. Despite this widespread contamination, the federal government invests few resources to protecting rivers, reservoirs, and groundwater from pollution in the first place. The information below summarizes test results for this utility and lists potential health concerns.
Contaminants Exceeding Health Guidelines
Other Detected Contaminants
Contaminants Not Detected - 150 chemicals
1,1,1,2-Tetrachloroethane, 1,1,1-Trichloroethane, 1,1,2,2-Tetrachloroethane, 1,1,2-Trichloroethane, 1,1-Dichloroethane, 1,1-Dichloroethylene, 1,1-Dichloropropene, 1,2 Dibromo-3-chloropropane (DBCP), 1,2,3-Trichlorobenzene, 1,2,3-Trichloropropane, 1,2,4-Trichlorobenzene, 1,2,4-Trimethylbenzene, 1,2-Dichloroethane, 1,2-Dichloropropane, 1,3,5-Trimethylbenzene, 1,3-Dichloropropane, 2,2-Dichloropropane, 2,4,5-t, 2,4,5-TP (Silvex), 2,4,5-Trichlorophenol, 2,4-d, 2,4-db, 2,4-Dinitrotoluene, 2,6-Dinitrotoluene, 2-Chloroethylvinyl ether, 2-Hexanone, 2-Methyl naphthalene, 3-Hydroxycarbofuran, Acenaphthene, Acenaphthylene, Acetochlor, Acrylonitrile, Alachlor (Lasso), Aldicarb, Aldicarb sulfone, Aldicarb sulfoxide, Aldrin, Allyl Chloride (3-chloro-1-propene), Anthracene, Aroclor 1016, Aroclor 1221, Aroclor 1232, Aroclor 1242, Aroclor 1248, Aroclor 1254, Aroclor 1260, Atrazine, Baygon (Propoxur), Bentazon (Basagran), Benzene, Benzo[a]anthracene, Benzo[a]pyrene, Benzo[b]fluoranthene, Benzo[g,h,i]perylene, Benzo[k]fluoranthene, bis(2-ethylhexyl) phthalate, Bromobenzene, Bromochloromethane, Bromoform, Bromomethane, Butachlor, Butyl Benzylphthalate, Carbaryl, Carbofuran, Carbon tetrachloride, Chloramben, Chlordane, Chloroethane, Chloromethane, Chrysene, cis-1,2-Dichloroethylene, cis-1,3-Dichloropropene, Dacthal, Dalapon, Di(2-Ethylhexyl) adipate, Di(2-ethylhexyl) phthalate, Di-n-butylphthalate, Dibenzofuran, Dibenz[a,h]anthracene, Dibromoacetic acid, Dibromomethane, Dicamba, Dichlorodifluoromethane, Dichlorprop, Dieldrin, Diethylphthalate, Dimethylphthalate, Dinoseb, Endrin, EPTC (Eptam), Ethyl Methacrylate, Ethylene dibromide (EDB), Fluoranthene, Fluorene, Fluorobenzene, Heptachlor, Heptachlor epoxide, Hexachlorobenzene (HCB), Hexachlorobutadiene, Hexachlorocyclopentadiene, Indeno[1,2,3-cd]pyrene, Iodomethane, Isopropylbenzene, Lindane, m- & p- Xylene, m-Dichlorobenzene, Methiocarb, Methomyl, Methoxychlor, Methyl isobutyl ketone, Methyl methacrylate, Metolachlor, Metribuzin, Molinate (Ordram), Monochlorobenzene (Chlorobenzene), Mtbe, n-Butylbenzene, n-Propylbenzene, Naphthalene, Nitrate, Nitrate & nitrite, Nitrite, o-Chlorotoluene, o-Dichlorobenzene, o-Xylene, Oxamyl (Vydate), p-Chlorotoluene, p-Dichlorobenzene, p-Isopropyltoluene, para-para DDE, Pentachlorophenol, Phenanthrene, Picloram, Propachlor, Pyrene, sec-Butylbenzene, Simazine, Styrene, Terbacil, tert-Butylbenzene, Tetrachloroethylene, Total polychlorinated biphenyls (PCBs), Toxaphene, trans-1,2-Dichloroethylene, trans-1,3-Dichloropropene, trans-1,4-Dichloro-2-butene, Trichloroethylene, Trichlorofluoromethane, Vinyl acetate, Vinyl chloride
|20||Total Contaminants Detected (2004 - 2007)|
Copper, Acetone, Methyl ethyl ketone, Tetrahydrofuran, Monochloroacetic acid, Monobromoacetic acid, Bromochloroacetic acid, Xylenes (total), Toluene, Ethylbenzene, Lead (total), Dichloroacetic acid, Trichloroacetic acid, Total haloacetic acids (HAAs), Chloroform, Bromodichloromethane, Dibromochloromethane, Total trihalomethanes (TTHMs), Dichloromethane (methylene chloride), Alpha particle activity
(pesticides, fertilizer, factory farms)
|6||Sprawl and Urban Pollutants|
(road runoff, lawn pesticides, human waste)
|10||Water Treatment and Distribution Byproducts|
(pipes and fixtures, treatment chemicals and byproducts)
Total trihalomethanes (TTHMs), Total haloacetic acids (HAAs), Chloroform, Bromodichloromethane, Dibromochloromethane, Dichloroacetic acid, Trichloroacetic acid, Monochloroacetic acid, Bromochloroacetic acid, Monobromoacetic acid
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)
EPA has not established a maximum legal limit in tapwater for these contaminants
EPA Violation Summary
No violations were reported for this system since 2004.
Information on violations is drawn directly from EPA's national violations database in the Agency's Safe Drinking Water Information System. Analyses by others have raised questions about the quality of the information in EPA's database. For the purposes of this investigation, EWG is not showing below or including in our analyses, those violations for individual water suppliers that occurred on days for which the total number of violations assigned by EPA to that water supplier was greater than 20. This criteria was based on common characteristics of incorrect violations data as identified by water utilities, from a review of EPA's violations data by several hundred utilities prior to the release of EWG's investigation.