How does ONWASA protect the public water system against Backflow contamination?

ONWASA has adopted rules and regulations, based upon State and Federal laws, that require the installation of backflow prevention assemblies at locations that have been identified as having potential hazards to the public water distribution system should a backflow condition occur. This includes all commercial properties and residential properties meeting certain criteria identified in Article VI of the ONWASA Utility Ordinance. Backflow assemblies are also required to be tested annually by a Certified Tester to ensure they function and continually protect the public water system. A link to Article IV may be found below.

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1. What is backflow?
2. How does ONWASA protect the public water system against Backflow contamination?
3. Why do I have to install a blackflow assembly if my neighbors do not have them?
4. How can I tell if water/sewer service is available to my property?
5. If I don't have direct access to a water or sewer main, will ONWASA extend a water and/or sewer main to my property?
6. Why are there blue or green marks and/or flags in my yard?