Why do I have to install a blackflow assembly if my neighbors do not have them?
The ONWASA Utility Ordinance requires the need for backflow prevention be reviewed for all new construction, at any time there is a change in the property’s owner or water service account holder, or whenever a hazard is identified by ONWASA personnel through an on-site survey. When your neighbors sell their property or the water service account changes, a site survey will be performed and if a backflow hazard is identified an installation will be required at that time. Residential properties where no identified hazard exists are not required to install a backflow assembly.

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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?