Residents of the Riverview Park neighborhood in Fall City are being warned this week to boil their tap water before drinking it. The Fall City Water District reported finding traces of E. coli bacteria in the water supply for the RV park during routine testing last week.

Lyn Watts, water district commissioner, said the district was able to isolate the parts of the system containing the bacteria to the Riverview Park neighborhood, preventing its spread.

“We sectioned off the neighborhood so water can flow in, but not spread out,” she said. “We know that the problem won’t be affecting the rest of Fall City.”

Fall City is working with the both the King County and state Health departments.

Officials haven’t projected an end-date for the problem. The Fall City Water District will continue doing tests every day to monitor bacteria levels and will notify the neighborhood residents when the water tests results are clean.

“As soon as we get a clean report we will go door to door and tell them it is safe,” Watts said. “Everybody understands it’s a rarity.”