No open EPA violations as of 2026-10-15.
EPA record checked 2026-10-06
From EPA's record for DE0000663. PurityMap is independent of Wilmington Water Department.
Every community water system publishes one each year. Your water bill or the utility's website links to it.
As listed in EPA's records. Your water bill names your supplier.
A ZIP code is a postal area, not a water service area. Your water bill names your supplier.
Are you this utility? Correct this listing →
31 results are on record. These 5 come first: results above a listed reference, then those closest to a legal limit.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 9.9 ng/L | 4.0 ng/L federal MCL (2024) | Above EPA's 2024 limit (one sample) | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluorobutanesulfonic acid (PFBS) | 3.6 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluorohexanoic acid (PFHxA) | 21.1 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluorobutanoic acid (PFBA) | 14.1 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluoroheptanoic acid (PFHpA) | 8.4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluoropentanoic acid (PFPeA) | 32.2 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Lead (90th percentile) | Non-Detect (ND) | 15 µg/L federal action level | Not detected above the reporting limit | 2021–2023 monitoring period | Lead & Copper Rule 90th-percentile: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-02-08 to 2023-11-07 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-11-07 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-11-07 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-11-07 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-11-07 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2024-01-31 | UCMR5 Analytical Results: WILMINGTON WATER DEPARTMENT (DE0000663) |
1health-based violation in the last 10 years · none open as of 2026-10-15
From EPA SDWIS. Counted once per contaminant per year in the Track record subject score. A violation record is a compliance fact, not a health verdict.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure
Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Tested your own tap? Read your results →
★ Best choice: Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200), certified for PFOA and lead.
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| ★ Best choice | Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200) | Certified for PFOA (NSF/ANSI 53, WQA) | $$ | Check price on Amazon |
| Also good | Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M) | Certified for PFOA (NSF/ANSI 53, WQA) | $$ | Check price at Aquasana |
| Also good | Aquasana Clean Water Machine Countertop Filter (AQ-CWM2) | Certified for PFOA (NSF/ANSI 53, WQA) | $$ | Check price at Aquasana |
★ Best choice: HealthShield™, certified for PFOA and Perfluoroheptanoic acid (PFHpA).
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| ★ Best choice | HealthShield™ | Certified for PFOA and Perfluoroheptanoic acid (PFHpA) (NSF/ANSI 53, WQA) | $$$$ | Check price at Aquasana |
| $ Budget pick | iSpring WGB32B-PFKS PFAS & Heavy Metals Whole House FilterUse code REFISPRING at checkout: 10% off your first iSpring order. | Brand lab-tested for PFAS, not independently certified for PFOA, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorobutanoic acid (PFBA), Perfluoroheptanoic acid (PFHpA) and Perfluoropentanoic acid (PFPeA) | $$$ | Check price at iSpring |
Also: lead picks →
PurityMap earns a commission from these links. "Best choice" and "Budget pick" go to certified products first; commission never decides them. As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Lead service lines
Wilmington Water Department reported 1,708 lead and 669 galvanized service lines to replace in EPA’s inventory (2026Q2). Many utilities replace these lines for free or share the cost. Ask Wilmington Water Department whether your home’s line is on its list before you pay anyone.
Local help
Call to be connected with a local plumbing provider about lead service lines, repiping or fixture replacement.
One email when a new sampling round is published or a result moves across its reference.
Follow this water →Its official website is wilmingtonde.gov, its phone number on EPA record is 302-576-3017 and its mailing address is Water Work Center, WILMINGTON, DE 19801. These details come from the system's EPA record and a check of its website.
Bills, starting service and stopping service are handled by Wilmington Water Department on its official website, wilmingtonde.gov. PurityMap does not take payments.
EPA's records list Wilmington Water Department as serving Wilmington, Delaware. Your water bill names your supplier.
PurityMap's record for Wilmington Water Department holds results for 29 PFAS substances. 6 were detected, and none is above a federal legal limit. Each result links to its source in the city report.
No open EPA violations as of 2026-10-15: that is what EPA's record shows for Wilmington Water Department. The record comes from EPA's SDWIS compliance database.
Wilmington Water Department is on EPA record as drawing from surface water.
Start with the hot-or-cold tap check. Where Wilmington Water Department reported something related, it's shown below.
Lead at Wilmington Water Department: not detected (90th percentile, 2021–2023 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.