COLLEGE PLACE - An order to boil water for some 170 residences and businesses of the Green Tank Irrigation District ended this weekend.
The boil water order was issued June 9 after water tests detected coliform bacteria, including E. coli.
Officials with the Washington state Department of Health reported that 10 water samples taken Thursday and Friday all came up "satisfactory."
On Saturday the department notified residents the boil-water order was over.
The water system was disinfected and flushed. Officials also reported the source for the contamination was never determined.
Testing will now revert to a monthly schedule. The cost for the extra testing and site investigations will be paid for by customers of the irrigation district.
No illnesses were reported in connection with the contaminated water.
The district is bordered by Northeast Rose Street and North College and Wallula avenues.