The Environment Agency has started its annual testing regime to make sure the water on the Lincolnshire coast meets strict quality standards.
Samples will be taken in the next five months at nine locations including Cleethorpes (pictured), Skegness, Mablethorpe and Humberston, the Environment Agency said.
Sampling and Collection Team Leader Adrian Lack said: “We will be taking samples from all nine bathing beaches in Lincolnshire and North East Lincolnshire to check that they continue to meet bacteriological water quality standards.
“We test for bacteria that are usually associated with upset stomachs and which can come from waste water or from poorly-treated sewage or animal faeces.”
The Environment Agency takes 20 samples every year from EU-designated bathing water site in England between 5th May and 30th September.