Backflow Protection Illustrated

In the modern world, we rely on community water distribution systems to deliver safe drinking water. However, that same distribution system also delivers water for purposes other than human consumption. Some of those uses might introduce contamination to the drinking water if the system is not protected. By separating water used for other purposes, we can ensure the potable water remains safe for consumption.

When placed correctly, backflow preventers work well to protect the drinking water. As can be seen in the illustration below, a facility might have many water uses that can introduce contamination. Almost all properties have one or more of these features. They must be configured to protect against contamination entering the drinking water.

The water meter backflow protection is installed where the user's facility connects to the community water system (water district). This "system protection" separates the community from activities within the facility. A backflow preventer is also installed on the fire sprinkler line as "system protection". Water in a fire sprinkler system is stagnant and will develop poor aesthetic qualities and even bacteria and toxins which are harmful to human health. The water district will require system protection as a condition of continued service where ever threatening conditions exist.

There also are backflow preventers within the facility. These protect drinking water within the facility from contamination from other water uses. The facility operator should understand the water uses and equipment they own, and ensure adequate protection of their potable water is maintained.