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Why would backflow need to be prevented?

Backflow can be hazardous. In the EPA’s “Best Practices Guide”, it is stated: “Cross connections are ever present dangers that exist in most water systems and can result in serious chemical or microbiological contamination events in drinking water systems.” Backflow can occur from something as simple as a garden hose left in a bucket of cleaning solution, but can also be much more serious.


One example of what can happen occurred within 55 miles of Durango at a public school. A chemical used in the heating system boilers backflow into the drinking water. Samples taken determined that the chemical was chromium in levels as high as 700 parts per million. The head chemist said that it was miraculous that no one was seriously injured or killed. They were lucky. The yellowish water was discovered by a home economics teacher before school started and proper precautions were taken.

Show All Answers

1. What is a cross connection?
2. Why do such cross connections exist?
3. What is a Cross Connection Control Program?
4. What is backflow?
5. What is a backflow preventer?
6. Why would backflow need to be prevented?
7. How will a backflow preventer affect my plumbing system?
8. Why do backflow assemblies need to be tested periodically?
9. Will my water service be interrupted for backflow prevention assembly testing?
10. How much will it cost to have my backflow prevention assembly installed and tested?
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