All 35 systems met the sampling requirement for a yearly average. Of those systems, 12 had at least one yearly average above an EPA comparison level and 23 did not.
EPA-based study benchmark: a fixed, unrounded research cutoff used to reproduce EPA’s final UCMR 5 technical-assistance classification based on the April 2024 federal levels. It is not a current federal or state standard. The label does not determine compliance, household exposure, or health risk.
State rules: The labels on this page use fixed research cutoffs based on the April 2024 federal levels. Delaware may use different current standards or guidance. These UCMR 5 results do not determine current federal or state compliance. Find the official Delaware drinking-water program →
Find your water system
A ZIP code finds possible public water systems for an area; it cannot identify the supplier for a specific home. Confirm the provider using a water bill or utility record.
System counts in Delaware
Each count shows how many included water systems had a yearly average above the named EPA comparison level.
| EPA rounding cutoff | Systems above comparison level | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 9 | 35 | 25.7% |
| PFOS: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 8 | 35 | 22.9% |
| PFHxS: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 35 | 0.0% |
| PFNA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 1 | 35 | 2.9% |
| HFPO-DA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 35 | 0.0% |
| Hazard Index: 1 level; unrounded index ≥1.5 and at least two detected components | 1 | 35 | 2.9% |
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had every required sample needed to calculate a yearly average. It does not mean every location or home was tested. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | EPA comparison result |
|---|---|---|---|---|---|
| ARTESIAN NORTHERN SUSSEX REGIONAL | DE0020003 | 5,511 | Ground water | 3 | No available average above comparison levels |
| ARTESIAN WATER COMPANY | DE0000552 | 231,114 | Surface water purchased | 22 | Above an EPA comparison level |
| BAYSIDE PUMP DISTRICT | DE00A0837 | 8,400 | Ground water | 2 | No available average above comparison levels |
| BETHANY BAY PUMP DISTRICT | DE0000221 | 51,000 | Ground water | 5 | Above an EPA comparison level |
| BETHANY BEACH WATER DEPARTMENT | DE0000556 | 12,000 | Ground water | 1 | No available average above comparison levels |
| BRIDGEVILLE WATER DEPARTMENT | DE0000559 | 6,000 | Ground water | 3 | No available average above comparison levels |
| CAMDEN PUMP DISTRICT | DE0000124 | 17,208 | Ground water | 5 | No available average above comparison levels |
| CAMDEN WYOMING SEWER AND WATER AUTHORITY | DE0000563 | 5,000 | Ground water | 3 | No available average above comparison levels |
| CHURCH CREEK | DE00A0428 | 9,654 | Ground water | 5 | No available average above comparison levels |
| DELMAR UTILITY COMM (TN OF DELMAR) | DE0000567 | 2,027 | Ground water | 1 | No available average above comparison levels |
| DEWEY BEACH WATER DEPARTMENT | DE0000825 | 31,000 | Ground water purchased | 1 | Above an EPA comparison level |
| DOVER AIR FORCE BASE | DE0000579 | 11,000 | Ground water | 1 | No available average above comparison levels |
| DOVER WATER DEPARTMENT | DE0000571 | 39,491 | Ground water | 16 | No available average above comparison levels |
| EAST NCC DISTRICT | DE00A0334 | 5,538 | Ground water | 2 | No available average above comparison levels |
| GARRISON LAKE PUMP DISTRICT | DE0000004 | 17,148 | Ground water | 3 | No available average above comparison levels |
| GEORGETOWN WATER DEPARTMENT | DE0000592 | 7,259 | Ground water | 2 | Above an EPA comparison level |
| LAUREL WATER DEPARTMENT | DE0000597 | 3,984 | Ground water | 1 | No available average above comparison levels |
| LEWES BOARD OF PUBLIC WORKS | DE0000602 | 9,627 | Ground water | 1 | Above an EPA comparison level |
| LONG NECK WATER COMPANY | DE0000625 | 11,000 | Ground water | 4 | No available average above comparison levels |
| MIDDLETOWN WATER DEPARTMENT, DE | DE0000614 | 17,700 | Surface water purchased | 2 | No available average above comparison levels |
| MILFORD WATER DEPARTMENT | DE0000616 | 9,800 | Ground water | 5 | No available average above comparison levels |
| MILLSBORO WATER DEPARTMENT | DE0000622 | 8,568 | Ground water | 1 | No available average above comparison levels |
| MUNICIPAL SERVICES COMMISSION | DE0000634 | 5,549 | Ground water | 1 | No available average above comparison levels |
| NEWARK WATER DEPARTMENT, DE | DE0000630 | 40,000 | Surface water | 2 | Above an EPA comparison level |
| NORTH WEST PUMP DISTRICT | DE00A0347 | 4,149 | Ground water | 3 | No available average above comparison levels |
| REHOBOTH BEACH WATER DEPARTMENT | DE0000723 | 25,000 | Ground water | 3 | Above an EPA comparison level |
| REHOBOTH PUMP DISTRICT | DE0000991 | 81,417 | Ground water | 12 | No available average above comparison levels |
| SEAFORD WATER DEPARTMENT | DE0000246 | 6,699 | Ground water | 2 | No available average above comparison levels |
| SMYRNA WATER DEPARTMENT | DE0000657 | 11,813 | Ground water | 3 | Above an EPA comparison level |
| SOUTH BETHANY | DE00A0323 | 18,215 | Ground water | 3 | Above an EPA comparison level |
| STAGE VILLAGE MHC | DE0000569 | 93 | Ground water | 1 | Above an EPA comparison level |
| SUEZ WATER DELAWARE | DE0000564 | 100,495 | Surface water | 2 | Above an EPA comparison level |
| SUSSEX SHORES WATER COMPANY | DE0000557 | 12,450 | Ground water | 2 | No available average above comparison levels |
| SWANN KEYS | DE0000465 | 1,764 | Ground water | 1 | No available average above comparison levels |
| WILMINGTON WATER DEPARTMENT | DE0000663 | 107,976 | Surface water | 2 | Above an EPA comparison level |
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system.