Warning signs were put up at Waiinu beach in January after a single sample of freshwater emerging on the sand was found to have abnormally high levels of faecal coliform bacteria.
The water emerging from a swamp there forms shallow pools, and children often play in it.
South Taranaki District Councip put up signs on January 15, warning people to stay clear, communications manager Gerard Langford said.
Since then levels have been satisfactory, and the signs were to be taken down yesterday.
The highest level of the bacteria was found at the southeastern end of the beach. The source is unknown and could have been animals, birds or humans.