PFAS in Delaware drinking water
EPA's final UCMR 5 data covers 36 public water systems in Delaware, serving about 935,649 people. PFAS turned up in 17 of them (47%). 12 averaged above at least one EPA limit at a sampling point, affecting about 633,592 people.
Highest PFOA and PFOS averages among systems serving 1,000 or more: Georgetown Water Department (18.0 / 13.5 ppt), Newark Water Department (22.6 / 7.4 ppt), Artesian Water Company (22.2 / 5.6 ppt), Suez Water Delaware (19.3 / 0.0 ppt) and Smyrna Water Department (9.6 / 6.7 ppt).
Every tested system in Delaware
Largest first. PFOA and PFOS columns show the average at each system's worst sampling point; EPA's limit for each is 4 ppt. Filter by name:
| Water system | People | PFOA | PFOS | PFAS found | Result |
|---|---|---|---|---|---|
| Artesian Water Company | 231,114 | 22.2 | 5.6 | 8 | Above limit |
| Wilmington Water Department · Wilmington | 107,976 | 7.7 | - | 6 | Above limit |
| Suez Water Delaware · Wilmington | 100,495 | 19.3 | - | 9 | Above limit |
| Rehoboth Pump District | 81,417 | 2.2 | - | 4 | Sample at limit |
| Bethany Bay Pump District | 51,000 | - | 5.6 | 1 | Above limit |
| Newark Water Department · Newark | 40,000 | 22.6 | 7.4 | 8 | Above limit |
| Dover Water Department · Dover | 39,491 | - | - | 0 | None found |
| Dewey Beach Water Department · Frankford | 31,000 | 9.6 | - | 5 | Above limit |
| Rehoboth Beach Water Department · Rehoboth Beach | 25,000 | 10.6 | 3.1 | 7 | Above limit |
| South Bethany | 18,215 | - | 4.5 | 1 | Above limit |
| Middletown Water Department · Middletown | 17,700 | - | - | 0 | None found |
| Camden Pump District | 17,208 | - | - | 0 | None found |
| Garrison Lake Pump District | 17,148 | - | - | 0 | None found |
| Sussex Shores Water Company · Bethany Beach | 12,450 | - | - | 0 | None found |
| Bethany Beach Water Department · Bethany Beach | 12,000 | - | - | 0 | None found |
| Smyrna Water Department · Smyrna | 11,813 | 9.6 | 6.7 | 5 | Above limit |
| Dover Air Force Base | 11,000 | - | - | 0 | None found |
| Long Neck Water Company · Long Neck | 11,000 | - | - | 0 | None found |
| Milford Water Department · Milford | 9,800 | - | - | 0 | None found |
| Church Creek | 9,654 | - | - | 0 | None found |
| Lewes Board of Public Works · Lewes | 9,627 | 3.1 | 7.2 | 3 | Above limit |
| Millsboro Water Department · Millsboro | 8,568 | - | - | 0 | None found |
| Bayside Pump District | 8,400 | - | - | 3 | Below limits |
| Georgetown Water Department · Georgetown | 7,259 | 18.0 | 13.5 | 11 | Above limit |
| Seaford Water Department · Seaford | 6,699 | - | - | 2 | Below limits |
| Bridgeville Water Department · Bridgeville | 6,000 | - | - | 0 | None found |
| Municipal Services Commission · New Castle | 5,549 | - | - | 2 | Below limits |
| East Ncc District | 5,538 | - | - | 0 | None found |
| Artesian Northern Sussex Regional | 5,511 | 2.9 | - | 4 | Sample at limit |
| Camden Wyoming Sewer and Water Authority · Camden | 5,000 | - | - | 0 | None found |
| North West Pump District | 4,149 | - | - | 0 | None found |
| Laurel Water Department · Laurel | 3,984 | - | - | 0 | None found |
| Delmar Utility Comm (tn of Delmar) · Delmar | 2,027 | - | - | 0 | None found |
| Swann Keys · Salisbury | 1,764 | - | - | 0 | None found |
| Stage Village Mhc · Dagsboro | 93 | 6.8 | 8.0 | 5 | Above limit |
| Meadows Pump District | - | - | 0 | None found |
On a private well in Delaware?
EPA's program only covers public systems. Private wells are never part of UCMR 5, so the only way to know is to test. Our well testing guide covers which lab tests to order, and the best well water systems covers what to install once you have results.
Cite this page
Well & Tap. "PFAS in Delaware drinking water: results for 36 systems." Data: U.S. EPA UCMR 5, final release August 2026. https://wellandtap.com/pfas/delaware/
Source: EPA UCMR 5 final occurrence data (August 2026); population from EPA SDWIS. Method.