MOSES LAKE - Most of Moses Lake is now safe for boating and irrigating after last week’s sewage spill that prompted a seven-day no contact advisory, according to the Grant County Health District.
The latest lake samples taken this week show most of the affected areas have improved. The health district still recommends people stay out of the lake at Blue Heron Park until further tests results are completed. Test results at the spill site were at acceptable levels.
The state Department of Ecology is also recommending the city conduct tests upstream and downstream.
The health district is not extending the no contact advisory at this time.
Despite the improved water quality following the sewage spill, toxic blue-green algae levels remain high in the lake and swimming is not recommended.
The sewage spill on Aug. 28 was caused by a baseball-sized hole in the Knolls Vista siphon. City wastewater employees installed a stainless steel band to stop the discharge. About 64,000 gallons of raw sewage was released into the lake, according to city officials.
The Moses Lake City Council is expected to approve a resolution at Tuesday’s meeting declaring an emergency to address the failing sewer siphon. The city plans to make immediate upgrades to the collection system in the Knolls Vista and Sage Bay tributaries. The existing sewer main siphon, from Northshore Drive to Broadway Avenue, has experience multiple breaks over the past few years due to the age and deterioration of the steel pipe that has been in service for decades.