Forever Chemicals
Maybe you are an island family weighing a move between Oahu and the neighbor islands, and you want to know what is actually documented about the water when evaluating an address. That instinct is a good one. Hawaii's drinking water is overseen by the Hawaii Department of Health and its Safe Drinking Water Branch, the office that administers federal PFAS standards for the systems serving most residents. The figures below come straight from public monitoring records, not from us. They will not tell you whether any single home is fine, but they are worth reviewing when evaluating an address, and they orient you toward the office that actually watches this for the state.
EPA's UCMR 5 program (2021–2024) tested 43 public water systems in Hawaii for 29 PFAS compounds; 0 reported at least one detection and none exceeded the 2024 federal limit of 4 ppt for PFOA/PFOS (a 0% detection rate). Detections vary by water system — check the utility serving a specific Hawaii address.
In Hawaii, drinking water sits under the Hawaii Department of Health (DOH) and, more specifically, its Safe Drinking Water Branch, which administers the federal standards your public system is held to. Hawaii is among the states that largely rely on the federal limits the agency administers rather than writing its own enforceable PFAS numbers, so what protects an islander's tap is the April 2024 EPA rule that the DOH carries out. That arrangement tends to make the federal limits the practical floor here, with the state office acting as the local steward of testing and reporting.
Numbers below come straight from EPA UCMR 5 monitoring (2021–2024). Every public water system in Hawaiiserving more than 3,300 people had to test for 29 different PFAS — here's what they reported.
43
Water systems tested
UCMR 5 (2021–2024)
0
Systems with any PFAS detected
0% detection rate
0
Systems exceeding 2024 MCL
Above 4 ppt PFOA/PFOS
0
Distinct PFAS compounds detected
Of 29 monitored under UCMR 5
0
TRI-reporting PFAS facilities
EPA Toxics Release Inventory 2024
0
DoD PFAS installations
Military PFAS contamination sites
Looking at a specific Hawaiicity? Each page below pulls the same federal data narrowed to that water system — useful whether you're relocating, buying, organizing your neighborhood around getting cleaner water, or just trying to find out what's in the tap and what's around you.
Start with what the records below can and cannot say. The federal monitoring round you are looking at (UCMR5) checked 29 PFAS compounds at public systems generally serving more than 3,300 people, across roughly 2021 to 2024. That scope matters: a detection logged in that window is a snapshot, not a live reading of today's tap, and the testing requirement skips private wells and many small rural systems entirely. In Hawaii, where catchment and small-system water are part of daily life on some islands, that gap is worth holding in mind, and the Department of Health's drinking-water program is the place to ask about well-water guidance. Read the figures above as a starting map of where to look, not a verdict on any one address. Acronym soup like UCMR is its own small adventure, but the underlying idea is simple: these are public records, read them as such.
Yes. EPA UCMR 5 monitoring (2021–2024) tested 43 public water systems in Hawaii; 0 had at least one PFAS detection. Detections vary by water system — check your specific serving utility.
Hawaii is among the states that largely rely on the federal limits its environmental agency administers rather than adopting its own separate enforceable PFAS numbers. In practice, residents on public systems are covered by the April 2024 federal rule, which the Hawaii Department of Health (DOH) carries out through its Safe Drinking Water Branch.
The Hawaii Department of Health (DOH), through its Safe Drinking Water Branch, administers federal drinking-water standards for public systems, including the PFAS limits set by EPA in April 2024. The agency tends to function as the state-side steward of testing and reporting rather than the author of separate state PFAS numbers.
The Hawaii Department of Health (DOH) is the state environmental and public-health agency. Its Safe Drinking Water Branch oversees public drinking-water systems statewide and administers the federal standards your tap water is measured against.
Use VetMyAddress to see the PFAS detections reported for the public water system serving any Hawaii address, alongside nearby military bases and industrial PFAS sources. The data comes from EPA UCMR 5, EPA TRI, and the DoD PFAS installation report.
In April 2024 the EPA set the first enforceable federal limits for PFAS in drinking water: 4 parts per trillion for PFOA and PFOS, and 10 ppt each for PFHxS, PFNA, and HFPO-DA (GenX), plus a Hazard Index for certain mixtures. Public water systems must complete initial monitoring by 2027 and come into compliance after that.
No. The federal limits apply to public water systems. Private well owners are responsible for their own testing and treatment, which is especially worth doing near a known PFAS source like a military base or industrial site.
State numbers tell you the pattern. An address report tells you what's actually in the water at yourkitchen sink — the matched utility, the PFAS detections on file, and every military or industrial source nearby. Whether it's for your family, your neighbors, or peace of mind.
Data sources: EPA UCMR 5 bulk data · EPA TRI 2024 · DoD PFAS installation report