Frequent Questions

When must PWSs comply with the Revised Total Coliform Rule (RTCR requirements?

Unless a State determines an earlier effective date, all Public Water Systems (PWSs) must comply with the RTCR requirements starting April 1, 2016. All PWSs include:

  • Community Water Systems (CWSs),

  • Non-Transient Non-Community Water Systems (NTNCWSs), and

  • Transient Non-Community Water Systems (TNCWSs).

Have more questions? Submit a request