All of the Skippack Township residents who had left their homes Sunday night because of a foul odor were set to spend the night at home Tuesday, after investigators conducted more monitoring and found improved conditions in houses.
"The levels are significantly lower," Skippack Township Fire Company Chief Haydn Marriott said Tuesday.
On Sunday, 151 households in the Fairlawn Court development were evacuated after residents of one house reported smelling a bad odor.
An initial reading in the basements of that house and others indicated the presence of the potentially harmful compound hydrogen cyanide. The chemical, investigators had said, was coming from sump pump pits in the basements.