The King's Beach UV Pilot Study summarizes the results and findings from the UV Pilot, which was operated for approximately 2 months (59 days) during the 2025 beach season from June 20th to August 17th.
The UV Pilot was designed to operate continuously during dry and wet weather (with the exception of large rainfall events) and convey and treat flows up to approximately 5 million gallons per day (mgd). This includes all dry weather flows as well as all wet weather flows from rainfall events less than approximately 0.25 inches in depth. For rainfall events greater than 0.25 inches, the system was designed to remain on, but would not be able to treat all flows. For events greater than 0.8 inches, the system was planned to be shut down until the conclusion of the storm to avoid capacity issues in the Swampscott culvert. For large events greater than 2 inches, the weir walls were to be removed to reinstate the full original conveyance capacities of both culverts.
The full report can be found below.