Hawaii Department of Health officials visited the Kapilina Beach Homes development in western O’ahu on Thursday to collect water samples for testing.
The subdivision is on former Navy land and still uses water from its distribution system.
Some residents have complained of physical ailments similar to those suffered by residents of military housing near Joint Base Pearl Harbor-Hickam.
The Navy has closed two of its water wells that provide water to some 93,000 people after the detection of oil contamination.
The Navy and the Department of Health say they are still investigating the source of the contamination.
On Wednesday, the Navy said it detected diesel fuel in a second water source, the Aiea-Halawa well – but appeared to backtrack later, claiming the sample came from a source that was not in use. .
The Honolulu Water Supply Board said it had received verbal confirmation that the water from the BWS Halawa well is not contaminated with petroleum.
The back-and-forth between the Navy and entities like the state Department of Health has caught the attention of US Senator Brian Schatz. It issued a statement calling for the Federal Environmental Protection Agency to be the lead agency for collecting, testing and analyzing water samples.
Schatz said the people of Hawaii cannot stand another day of disagreements between the Navy and government officials over the safety of drinking water.