"Thirty-three samples were taken over a three day period with 11 samples taken each day," said Keith Thomas, public works director.
"The samples came back negative for all pathogens."
Customers are advised to flush faucets for a total of 10 minutes to introduce system water throughout house plumbing.
Also, it is advised to discard any drinks made during the boil water notice, rewash any food or drink contact items, check water filters and replace if necessary, and run dishwasher through a cycle for two before washing dishes.
Customers should not use water from hot water heaters for drinking until several exchanges of the tank have occurred.
"Unless it is an emergency, we will be sure to give prior notice to the public if we will need to turn the water off again," said Thomas.
Shaw water system officials notified the Mississippi State Department of Health in early July of a system wide pressure loss due to one or more line breaks.
When a distribution system loses pressure, contaminants can siphon back into the water. Public health officials consider any system that loses pressure contaminated until tests prove otherwise.
For more information on procedures visit the Mississippi State Department of Health website at msdh.ms.gov.