[Code of Federal Regulations]
[Title 40, Volume 21]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR131.13]

[Page 409]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 131_WATER QUALITY STANDARDS--Table of Contents
 
           Subpart B_Establishment of Water Quality Standards
 
Sec.  131.13  General policies.

    States may, at their discretion, include in their State standards, 
policies generally affecting their application and implementation, such 
as mixing zones, low flows and variances. Such policies are subject to 
EPA review and approval.