Is there PFAS in Rehoboth Pump District water?
Some. At least one sample reached an EPA limit, but the average at every sampling point stayed below it.
Rehoboth Pump District
Serves 81,417 people · 24 PFOA samples from 12 sampling points · Apr 2024 to Oct 2024
One or more samples at an EPA limit
PFOA Perfluorooctanoic acid
2.2 ppt avg · max 4.4
PFOS Perfluorooctanesulfonic acid
not detected
Hazard index GenX, PFBS, PFNA, PFHxS combined
not detected
Also detected, no federal limit: PFPeA, PFHxA, PFBS.
Rehoboth Pump District is a public water system drawing on groundwater, Delaware, serving about 81,417 people, including Harbeson, Lewes, Millsboro, Milton, Nassau, Rehoboth Beach. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 24 times across 12 sampling points between Apr 2024 and Oct 2024.
Every PFAS detected
Not detected: PFUnA, PFDoA, PFNA, 11Cl-PF3OUdS, PFHpA, PFDA, NFDHA, NMeFOSAA, NEtFOSAA, PFTrDA, PFTA, PFHxS, PFPeS, PFMBA, PFMPA, PFOS, 8:2 FTS, 9Cl-PF3ONS, PFEESA, PFHpS, PFBA, ADONA, HFPO-DA, 6:2 FTS, 4:2 FTS.
Lithium, tested in the same program: not detected.
What the EPA limits mean here
In April 2024 EPA set enforceable limits of 4 ppt for PFOA and PFOS, 10 ppt each for PFHxS, PFNA and GenX, and a hazard index of 1 for mixtures. Utilities were given until 2029 to comply. In May 2026 EPA proposed keeping only the PFOA and PFOS limits and moving that deadline to 2031. Until that proposal is final, the 2024 limits stand.
Compliance is judged on a running annual average at each entry point, so we show the average at this system's worst sampling point next to its single highest result. UCMR 5 results do not by themselves put a utility in or out of compliance.
What you can do at home
Two routes work for PFAS. For drinking and cooking water only, a reverse osmosis system certified to NSF/ANSI 58 with a PFOA/PFOS reduction claim is the cheapest proven option. To treat every tap and shower, a whole-house carbon system with enough contact time works, but check that the maker has PFAS test data, not just a marketing claim. See the best filters for PFAS and how PFAS removal works.
Other systems in Delaware
All 36 tested systems in Delaware
ZIP codes served
19951 19958 19966 19968 19969 19971
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Cite this page
Well & Tap. "PFAS in Rehoboth Pump District water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID DE0000991. https://wellandtap.com/pfas/delaware/rehoboth-pump-district/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID DE0000991). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
