Figure: 30 TAC §290.115(a)(2)

Date to Start Stage 2 Compliance¹
This type of system:	Must comply with Stage 2 starting:
Systems that are not part of a combined distribution system and systems that serve the largest population in the combined distribution system:
System serving 100,000 or more population	April 1, 2012
System serving 50,000 to 99,999 population	October 1, 2012
System serving 10,000 to 49,999 population	October 1, 2013
System serving fewer than 10,000 population if the system distributes only treated groundwater or potable water purchased from another system	October 1, 2013
System serving fewer than 10,000 population that treats surface water (or groundwater under the direct influence of surface water) if no Cryptosporidium monitoring is required under §290.111(b)(3)(B) of this title (relating to Surface Water Treatment)	October 1, 2013
System serving fewer than 10,000 population that treats surface water (or groundwater under the direct influence of surface water) if Cryptosporidium monitoring is required under §290.111(b)(3)(B) of this title	October 1, 2014
Systems of any population that are part of a combined distribution system:
Consecutive system or wholesale system that is part of a combined distribution system	At the same time as the system with the earliest compliance date in the combined distribution system

¹The executive director may grant up to an additional 24 months for compliance with
maximum contaminant levels (MCLs) and operational evaluation levels if the system
requires capital improvements to comply with an MCL in accordance with 40 Code of
Federal Regulations §141.620(c).