Public Notice: August 2025 TTHM Exceedance
This notice is to advise our customers that our water system is in noncompliance with the drinking water standards for Total Trihalomethanes (TTHMs). Although this is not an emergency, as our customers, you have a right to know what happened, what you should do, and what we are doing to correct this situation.
This notice applies to customers served by the Maynard Water Division, located in Maynard, Massachusetts and those consumers directly served by our system in Acton, Stow and Sudbury. This notice does not apply to consumers who receive their water from a private well. We are required to monitor the drinking water for TTHM levels on a quarterly basis (once every three months) at four specific locations in the distribution system. The results of last quarters’ samples show that our system exceeded the standard or maximum contaminant level (MCL) for TTHMs at one out of four locations during the April through June 2025 compliance period. The standard for TTHMs is 80 parts per billion (ppb), and compliance is determined on a quarterly basis by averaging all samples collected at each location for the last 12 months (Locational Running Annual Average).
For more information please visit the TTHM webpage.