FORT YATES (AP) - Health officials began testing the water supply here Saturday, and trucks continued to deliver drinking water to residents, a week after the first taps ran dry.

The water system's tanks have been fully recharged, Ralph Walker, manager of the reservation's water system, said on Saturday.

Residents likely will not know if the water is safe for people until Wednesday, officials said.

Water stopped flowing into the Standing Rock reservation community's treatment plant after silt clogged the intake. The plant also supplies the towns of Porcupine and Cannon Ball.

Service was restored after Bureau of Reclamation workers connected a temporary pipeline to the plant from Lake Oahe.

"The treatment plant is back to kind of normal operations now," Walker said Saturday. Officials are running pumps around the clock as a precaution, he said.

Engineers are working on a plan to replace the aboveground diesel pumps with submersible electric models in case the temporary pipe needs to be moved.

Officials want to be prepared for any changes in the river channel, Walker said.

"The (Missouri) river dumped enough silt there in three months to totally cover the intake," he said. "When we did some modification to it in July or August, it was in 25 feet of water, and it was clear all around the structure."

Divers this week discovered the spot is now only 5 feet deep. Workers are preparing for a barge that divers will anchor in the depleted lake as they look for the clogged intake.

The Environmental Protection Agency requires that the water test safe for four consecutive days before people can drink it without boiling it. Officials took the first round of samples Saturday morning and testing takes 24 hours.

As a precaution, sampling will continue at eight sites once a week for four more weeks.

"We're still on the boil order," said Darrell Bullhead, Fort Yates water treatment supervisor.

The lack of drinking water continues to limit services at Fort Yates Hospital.

"We're seeing people on a walk-in and emergency basis," said Carl Ducheneaux, the hospital's deputy administrator. Also the dental clinic has been moved temporarily to McLaughlin, S.D., where dentists there are able to see patients.

By Monday, several some services will be available at the hospital, including mental health and optometry, Ducheneaux said.

Kitchen, inpatient, local dental and dialysis services will not be open until the water is safe to drink again.

"It's a tough situation," Ducheneaux said.

Although the water is not safe to drink, some are relieved that service is being restored, Bullhead said.

"Residents are happy," Bullhead said. "They got water back on for flushing and home use."

Others remain worried by the abrupt way the supply stopped last weekend, Walker said.

"It kind of just came up all of a sudden," he said.