PFAS Detections in Delaware ZIP Codes — 2026

Out of 34 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	34
Highest value	0.2 ppt
Median value	0.0 ppt
State	Delaware

Top 34 Worst ZIP Codes

Rank	ZIP Code	City	State	PFAS Status	Safety Score
1	19947	Georgetown	DE	0.2 ppt	81/100
2	19720	New Castle	DE	0.1 ppt	66/100
3	19701	Bear	DE	0.1 ppt	67/100
4	19702	Newark	DE	0.1 ppt	67/100
5	19707	Hockessin	DE	0.1 ppt	67/100
6	19711	Newark	DE	0.1 ppt	67/100
7	19713	Newark	DE	0.1 ppt	67/100
8	19804	Wilmington	DE	0.1 ppt	66/100
9	19805	Wilmington	DE	0.1 ppt	66/100
10	19703	Claymont	DE	0.0 ppt	67/100
11	19801	Wilmington	DE	0.0 ppt	66/100
12	19802	Wilmington	DE	0.0 ppt	66/100
13	19803	Wilmington	DE	0.0 ppt	66/100
14	19809	Wilmington	DE	0.0 ppt	66/100
15	19810	Wilmington	DE	0.0 ppt	66/100
16	19732	Rockland	DE	0.0 ppt	66/100
17	19806	Wilmington	DE	0.0 ppt	66/100
18	19807	Wilmington	DE	0.0 ppt	83/100
19	19808	Wilmington	DE	0.0 ppt	67/100
20	19971	Rehoboth Bch	DE	0.0 ppt	83/100
21	19975	Selbyville	DE	0.0 ppt	83/100
22	19940	Delmar	DE	0.0 ppt	83/100
23	19977	Smyrna	DE	0.0 ppt	83/100
24	19958	Lewes	DE	0.0 ppt	83/100
25	19951	Harbeson	DE	0.0 ppt	83/100
26	19966	Millsboro	DE	0.0 ppt	83/100
27	19968	Milton	DE	0.0 ppt	83/100
28	19939	Dagsboro	DE	0.0 ppt	83/100
29	19945	Frankford	DE	0.0 ppt	83/100
30	19967	Millville	DE	0.0 ppt	83/100
31	19970	Ocean View	DE	0.0 ppt	83/100
32	19973	Seaford	DE	0.0 ppt	96/100
33	19930	Bethany Beach	DE	0.0 ppt	83/100
34	19944	Fenwick Island	DE	0.0 ppt	82/100

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: 2026-08-31.

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.