A soaking midweek storm has temporarily turned King’s Beach and nearby Nahant Bay into off-limits territory, as Swampscott and Lynn officials warned residents Wednesday to avoid any contact with the water after a combined sewer overflow sent untreated or partially treated sewage into the surf. Residents are being told to stay out of the affected areas for at least 48 hours while crews and public health staff sample the water and inspect the outfalls.
The town’s notification, highlighted by Swampscott Tides, explains that the overflow "consists, or likely consists, of untreated or partially treated sewage and waste." Itemlive reports that the Lynn Water & Sewer Commission also issued an alert and confirmed the discharge stopped at 5:55 p.m. Tuesday.
What Officials Are Testing And Telling Residents
Swampscott’s Health Department says it collects weekly samples at each of the town’s six public beaches and recently added weekday testing at Fisherman’s Beach to better track where runoff is coming from, according to the town’s Beach Water Testing page. Lab results usually take about 24 hours to come back, and when bacteria levels spike, that typically triggers follow-up testing and a beach closure.
So the rule of thumb right now is pretty simple. “If it has rained, we are telling people: avoid the water,” Board of Health Chair Gargi Cooper told Itemlive.
Why King’s Beach Keeps Getting Dirty
For King’s Beach, most fingers point at Stacey’s Brook, a double-barreled outfall that carries stormwater and dilute sanitary waste from parts of Lynn and Swampscott straight toward the sand. Public health reviews and on-the-ground monitoring have identified it as the main driver of elevated bacteria near the outfall end of the beach.
A technical review organized by Save the Harbor/Save the Bay found consistently high bacteria counts in both barrels and called for stronger end-of-pipe monitoring and more aggressive efforts to track and eliminate upstream sources. The City of Lynn likewise details the outfalls and a multiyear monitoring and pilot program on its King’s Beach project pages.
How Long The Advisory Lasts And What To Watch
State health guidance and local advisories both say people should steer clear of affected waters for at least 48 hours after a combined sewer overflow. The Massachusetts Department of Public Health publishes current postings and daily test results on its Interactive Beach Water Quality Dashboard, which lets beachgoers see whether their favorite spot is open or under an advisory.
The Lynn Water & Sewer Commission’s CSO updates echo that 48-hour warning and link to a real-time map that tracks overflow activity around the system. Before heading to the shore, officials urge residents to check the DPH dashboard and the latest CSO notices.
What’s Next
Local leaders say the ramped-up sampling program this summer, along with a UV pilot project, is meant to generate the data needed to decide whether short-term disinfection fixes or bigger infrastructure overhauls make the most sense. According to the King’s Beach Steering Committee and Lynn’s project materials, the 2026 monitoring program kicked off in May and includes culvert testing, flow monitoring and wet-weather sampling to inform future engineering work.
Until lab results show the water has returned to safe levels, officials are asking residents to respect posted warnings and treat any flagged sections of the shoreline as strictly off-limits, no matter how tempting the surf looks on a hot day.
