Public water systems and retail public utilities required to
provide financial assurance as part of their Certificate of
Convenience and Necessity (CCN) must do so according to the rules
found in
Subchapter O of Chapter 37. 
If you are unsure whether your CCN requires you to provide
financial assurance, please contact TCEQ's Water Supply Division at
512/239-4691.
To find out more about the financial assurance options and
mechanisms, contact us.