AL/MS AWWA Effective Backflow Prevention

August 26, 2013

Sam McElroy, PECivil Services, LLCsammc@knology.net(256) 755-0050

Introduction

• Years ago, water systems did not include any form of backflow prevention in system designs.

• Today, systems are required by law to develop and implement a backflow prevention program which meets state’s requirements.

• We will look at basic policies for residential, commercial, irrigation and fireline backflow prevention.

• To help establish if the program is effective, we will consider the functionality, cost, and convenience of the system.

• We will also consider the acceptance of the program by the customers, the public and regulatory officials.

Cross Connection/Backflow Prevention - Definitions

• Cross Connection - Any physical connection or other arrangement through which unauthorized or potentially harmful materials can be introduced into drinking water.

• Backflow – a reversal of the normal direction of flow within a piping system.

• A backflow program should effectively protect a water system’s distribution lines from contamination or pollution from foreign substances which may compromise health.

• Check Valves -- typically do not have test ports. Are not considered true backflow preventers.

• Dual checks -- low hazard installations.

• Double Checks -- standard installations. Most common required.

• RPZ --- high hazard installations, chemicals, treatment plants, hospital.

Backflow Prevention - What is it?

Backflow Prevention - What is it?

Backflow Prevention Codes

• No single rule.

• Different states, city, counties have different requirements.

• Authority having jurisdictions may vary – water departments, fire departments, regulatory agencies, health department, inspection departments, etc.

Backflow Prevention

Alabama vs. Mississippi BFP Requirements

• Alabama State Law

• alabamaBFP.pdf

• Every connection shall have a BFP installed.

Alabama vs. Mississippi BFP Requirements

• mscrossconnection.pdf

• Mississippi State Law

• No low hazard installation shall be required to have a BFP.

Cost

• Installation Cost

• Maintenance Cost

• Eye Soar - Above ground installations, loss of land use

• Monitoring systems on some installations

Communication

• Does the public understand your BFP policy?

• How do you communicate your departmental requirements.

• How does the industry communicate BFP requirements?

• Marble Mountain Sprinkler Burn.mpg

Effective BFP Programs

• Many different programs and requirements exist for BFP requirements.

• Each system is required by law to develop and implement a backflow prevention program which meets minimum state’s requirements.

• Your program is most effective when you consider the functionality, cost, and convenience of the program.

• These aspects of the program should convey to customers the value of life safety though effective communications with customers and the public.

• Questions ???• Comments …

Sam McElroy, PECivil Services, LLCsammc@knology.net(256) 755-0050