PFAS Detections in Delaware ZIP Codes — 2026

Out of 43 ZIP codes with data in Delaware, these are the highest-ranked areas for pfas status. See also: National ZIP Codes with PFAS Detections in Water | All Delaware Rankings

Statistic	Value
ZIP codes ranked	43
Highest value	0.2 ppt
Median value	0.0 ppt
State	Delaware

Top 43 Worst ZIP Codes

Rank	ZIP Code	City	State	PFAS Status	Safety Score
1	19947	Georgetown	DE	0.2 ppt	93/100
2	19720	New Castle	DE	0.1 ppt	73/100
3	19701	Bear	DE	0.1 ppt	70/100
4	19702	Newark	DE	0.1 ppt	71/100
5	19707	Hockessin	DE	0.1 ppt	72/100
6	19711	Newark	DE	0.1 ppt	71/100
7	19713	Newark	DE	0.1 ppt	71/100
8	19804	Wilmington	DE	0.1 ppt	68/100
9	19805	Wilmington	DE	0.1 ppt	73/100
10	19703	Claymont	DE	0.0 ppt	55/100
11	19733	Saint Georges	DE	0.0 ppt	53/100
12	19801	Wilmington	DE	0.0 ppt	73/100
13	19802	Wilmington	DE	0.0 ppt	73/100
14	19803	Wilmington	DE	0.0 ppt	73/100
15	19809	Wilmington	DE	0.0 ppt	78/100
16	19810	Wilmington	DE	0.0 ppt	73/100
17	19708	Kirkwood	DE	0.0 ppt	53/100
18	19710	Montchanin	DE	0.0 ppt	75/100
19	19732	Rockland	DE	0.0 ppt	55/100
20	19806	Wilmington	DE	0.0 ppt	78/100
21	19807	Wilmington	DE	0.0 ppt	90/100
22	19808	Wilmington	DE	0.0 ppt	73/100
23	19850	Wilmington	DE	0.0 ppt	83/100
24	19880	Wilmington	DE	0.0 ppt	83/100
25	19884	Wilmington	DE	0.0 ppt	83/100
26	19898	Wilmington	DE	0.0 ppt	83/100
27	19899	Wilmington	DE	0.0 ppt	83/100
28	19971	Rehoboth Bch	DE	0.0 ppt	55/100
29	19975	Selbyville	DE	0.0 ppt	79/100
30	19940	Delmar	DE	0.0 ppt	95/100
31	19977	Smyrna	DE	0.0 ppt	87/100
32	19958	Lewes	DE	0.0 ppt	55/100
33	19951	Harbeson	DE	0.0 ppt	87/100
34	19966	Millsboro	DE	0.0 ppt	80/100
35	19968	Milton	DE	0.0 ppt	80/100
36	19969	Nassau	DE	0.0 ppt	88/100
37	19939	Dagsboro	DE	0.0 ppt	83/100
38	19945	Frankford	DE	0.0 ppt	90/100
39	19967	Millville	DE	0.0 ppt	94/100
40	19970	Ocean View	DE	0.0 ppt	84/100
41	19973	Seaford	DE	0.0 ppt	84/100
42	19930	Bethany Beach	DE	0.0 ppt	75/100
43	19944	Fenwick Island	DE	0.0 ppt	79/100

Methodology

PFAS detection data comes from EPA UCMR5 monitoring, state-level testing programs, and Consumer Confidence Reports. ZIP codes are ranked by maximum PFAS concentration detected. The EPA has set MCLs of 4 ppt for PFOA and PFOS individually. PFAS are persistent chemicals that do not break down in the environment.

Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-06-04.

Frequently Asked Questions

What are PFAS?

PFAS (per- and polyfluoroalkyl substances) are synthetic chemicals used in non-stick coatings, firefighting foam, and food packaging since the 1940s. They are called "forever chemicals" because they do not break down naturally. PFAS are linked to cancer, liver damage, thyroid disease, and immune system suppression.

How can I remove PFAS from my water?

Reverse osmosis (RO) and granular activated carbon (GAC) filters are effective at removing most PFAS from drinking water. NSF/ANSI 53 or 58 certified filters are recommended. Boiling water does NOT remove PFAS.