Tests for water contamination and landfill gas are to be carried out around houses built on a former pottery site in Dorset.
Soil samples will be taken from gardens and land in and around South Western Crescent in Parkstone in Poole, the council said.
Former South Western Pottery and clay pits were filled in the 1960s and 1970s before being developed for housing.
Landfill gas is a mixture of oxygen, carbon dioxide and methane.
Councillor Don Collier, from Poole council, said: "We want to reassure residents living in the area that these tests are a precaution and required as part of government legislation.
"We have consulted the Health Protection Agency and its advice is that residents should continue to live normally and use their homes, gardens and local open spaces as usual."
Residents are being sent letters telling them about the testing, which will start next week.
Drop-in information sessions will be held at both Baden Powell and St Peters School on Monday and Thursday.