Sorell Council is continuing its investigation into the cause of elevated bacteria levels detected at Primrose Beach, which were first identified during routine monitoring in the 2024-2025 summer season.

The contamination has primarily affected the western end of the beach near the boat ramp, according to council statements. Water quality at the eastern end, near the general store, has generally remained suitable for swimming.

Following the initial high readings, the council launched a detailed investigation in January 2025, which involved increased water sampling, testing of stormwater and seepage, and surveying septic systems at nearby properties. In February 2025, Pulse Tasmania reported that the council had described the bacteria readings as “much higher than the long-term figures”.

By March 2025, the council advised that while no single source had been identified, initial results from seepage samples suggested “some impact from local septic systems”. A council statement noted that the issue appeared to be a “communal impact from multiple systems in the area” and that identifying specific properties was “extremely difficult”. Many properties in the area have older septic systems that may be nearing the end of their operational life, the council said.

As a result of the ongoing issues, Sorell Council changed the water quality classification for the western end of the beach from ‘Good’ to ‘Moderate’. This classification means the area is still suitable for swimming but may experience occasional fluctuations in water quality. The council has used signage at beach access points to advise the public when swimming is not recommended.

To further the investigation, the council engaged an on-site wastewater specialist and a groundwater geologist. In late 2025, water quality monitoring pits were installed at Carlton Bluff to better understand groundwater movement and any potential influence from septic systems on the beach’s water quality.

In an update in January 2026, Sorell Council confirmed that groundwater testing at Carlton Bluff was continuing, with most results to date showing good water quality. The council has advised beachgoers to avoid swimming for 24 to 48 hours after heavy rainfall, a general recommendation also supported by the Department of Health.

The council has stated it will continue to keep the community updated as more results become available.