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Superfund Sites in Delaware
26 Superfund sites in 8 cities and 3 counties · Data as of 10/28/2026
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Superfund sites in Delaware at a glance
- With a population of 1,021,191, Delaware has 26 Superfund sites (0.25 per 10,000 people).
- That is about 4.7 times the national rate of 0.05 per 10,000.
- The most common type is Final NPL Site (17, 65%), followed by Deleted NPL Site (8) and Proposed NPL Site (1).
- The largest concentrations are in Dover (2), Millsboro (2) and New Castle (2).
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All Superfund sites in Delaware
26 listed, A to Z
- Army Creek LandfillFinal NPL Site, 11 contaminantsRte 13 + Rte 40, New Castle, DE
- Blades GroundwaterFinal NPL Site, 5 contaminantsNear Triangle Park at Intersection of, Blades, DE
- Chem-Solv, Inc.Deleted NPL Site, 9 contaminants176a N Dupont Highway, Dover, DE
- Coker's Sanitation Service LandfillsDeleted NPL Site, 25 contaminantsCounty Rte 152, Cheswold, DE
- Delaware City Pvc PlantFinal NPL Site, 3 contaminants780 School House Road, New Castle, DE
- Delaware Sand & Gravel LandfillFinal NPL Site, 34 contaminants229 Grantham Lane, New Castle, DE
- Dover Air Force BaseFederalFinal NPL Site, 78 contaminantsRte 113, Dover, DE
- Dover Gas Light co.Final NPL Site, 24 contaminantsNew St, Dover, DE
- East Basin Road GroundwaterFinal NPL SiteIntersection of School Ln and Rte. 13/N Dupont Hwy., New Castle, DE
- Georgetown North GroundwaterFinal NPL Site305 North Race Street, Georgetown, DE
- Halby Chemical co.Final NPL Site, 23 contaminants600 Terminal Ave, New Castle, DE
- Harvey & Knott Drum, Inc.Final NPL Site, 10 contaminantsOld County Rd, Kirkwood, DE
- Hockessin GroundwaterFinal NPL SiteOld Lancaster Pike at Railroad Crossing, Hockessin, DE
- Koppers co., Inc. (Newport Plant)Final NPL Site, 81 contaminantsFoot of Lindburg St, Newport, DE
- Millsboro TCEProposed NPL Site225 West Dupont Highway, Millsboro, DE
- Ncr Corp. (Millsboro Plant)Final NPL Site, 8 contaminantsMitchell Rd Pob 607, Millsboro, DE
- New Castle SpillDeleted NPL Site, 1 contaminant900 Wilmington Road, New Castle, DE
- New Castle SteelDeleted NPL Site9th & Washington Street, New Castle, DE
- Newark South Ground Water PlumeFinal NPL SiteBlue Hen Drive, Newark, DE
- Sealand LimitedDeleted NPL SiteRoute 896 + 15, Middletown, DE
- Standard Chlorine of Delaware, Inc.Final NPL Site, 80 contaminants745 Governor Lea Rd, New Castle, DE
- Sussex County Landfill no. 5Deleted NPL Site, 5 contaminantsBetween Cnty Rd 494, Cnty Rd 497, Sh 24, Laurel, DE
- Tybouts Corner LandfillFinal NPL Site, 9 contaminantsUS Rte 13 & Del Rte 71, New Castle, DE
- Tyler Refrigeration PitDeleted NPL Site, 3 contaminantsGlenwood Ave, Smyrna, DE
- Wildcat LandfillDeleted NPL Site, 15 contaminantsLebanon Rd, Dover, DE
- e.i. du Pont de Nemours & co., Inc. (Newport Pigment Plant Landfill)Final NPL Site, 10 contaminantsJames & Water Sts, Newport, DE
Frequently asked questions
- How many Superfund sites are in Delaware?
- There are 26 Superfund sites in Delaware in our data as of 10/28/2026.
- Which Delaware cities have the most Superfund sites?
- Dover (2), Millsboro (2), New Castle (2), Blades (1), Cheswold (1).