The Board of Selectmen may declare any sewer laid in any land,
street or way, public or private, opened or proposed to be opened
for public travel, to be a common sewer and the same shall not be
laid or connected with any existing common sewer except by the Town
officials authorized by law to lay and maintain common sewers.
The Board of Health may make and enforce regulations for the
public health and safety relative to house drainage and its connections
with sewers, if a public sewer abuts the estate to be drained.