Three samples collected from Wayland’s drinking water during routine tests in August tested positive for coliform bacteria, according to a notice from the Wayland Department of Public Works.
The DPW said the situation in “not an emergency,” adding that there is no need for residents to boil their water or take other corrective action.
According to the notice, Wayland collected 33 samples as part of state-required tests in August. Three of those samples showed the presence of coliform; the state standard is that no more than one sample show the bacteria.
Coliform bacteria, the DPW notice states, are not harmful themselves, but can indicate the presence of other, potentially harmful bacteria in the environment.
After receiving the sample results, the Wayland Water Division collected additional samples, increased the chlorine dosage at all treatment plants and replaced the chlorine injection pumps as a secondary precaution.
The additional samples did not reveal any potentially harmful bacteria.
While there is no general health risk from coliform bacteria, individuals with “severely compromised immune systems, infants and some elderly may have been at risk,” the notice states. These individuals should consult their healthcare providers.