Figure: 30 TAC §290.115(c)(5)(B)

Timing of Stage 1 Samples Evaluated for 40/30
Initial Distribution System Evaluation (IDSE) Waiver
This type of system: 40/30 certification is based on eight consecutive
calendar quarters of Stage 1 compliance
monitoring results beginning no earlier than1
Systems that are not in a combined distribution system:
System serving 100,000 or more
January 2004
System serving 50,000 to 99,999
System serving 10,000 to 49,999
January 2005
System serving fewer than 10,000 people
Systems in a combined distribution system
Consecutive or wholesale system of
any population
At the same time as the largest system in the
combined distribution system

1A system that did not monitor during the specified period must base eligibility on
compliance samples taken during the 12 months preceding the specified period.