DC Water Cross-Connection Control Policy Manual

This manual describes the District of Columbia Water and Sewer Authority (DC Water) Cross-Connection Control Program and the responsibilities for individual consumers, DC Water, the DC Department of Consumer Regulatory Affairs (DCRA), the DC Department of Health (DOH), and the EPA Region III (the enforcement agency for DC). The degree of hazard, methods of backflow control, and guidance for selecting appropriate devices are defined in the manual. Procedures for facility inspections and backflow-prevention assembly field tests are presented in detail to provide clear guidance for complying with DC Water's policies.

Table of Contents

  1. Section 1: Introduction (PDF 275 kb)
    1. 1.1 Purpose of the Manual
    2. 1.2 DC Water's Cross-Connection Control Policy
    3. 1.3 Program Responsibilities
    4. 1.4 Consumer Education Program
  2. Section 3: Cross-Connection Principles (PDF 320 kb)
    1. 3.1 Definition of Cross-Connection
    2. 3.2 Causes of Backflow
    3. 3.3 Cross-Connection Control Methods
  3. Section 4: Application of Backflow Prevention Assemblies (PDF 181 kb)
    1. 4.1 Criteria for Selecting Assemblies
      1. 4.1.1 Backflow Type
      2. 4.1.2 Operating Condition
      3. 4.1.3 Degree of Hazard
    2. 4.2 Selecting Assemblies for Specific Situations
    3. 4.3 Selecting Assemblies for Fire Protection Systems
  4. Section 5: Approved Cross-Connection Assemblies (PDF 45 kb)
    1. 5.1 Background
    2. 5.2 DC Water's Policy
  5. Section 6: Backflow Prevention Assembly Installation Requirements (PDF 361 kb)
    1. 6.1 Air Gap Separation Using Receiving Tanks
    2. 6.2 Mechanical Devices
      1. 6.2.1 General Requirement of Installation
      2. 6.2.2 Installation of Approved RPBA and RPDA
      3. 6.2.3 Installation of Approved DCVA and DCDA
      4. 6.2.4 Installation of DCVA's and DCDA's in Below Ground Pits

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