The City of Oak Harbor Water Division has provided these documents to help you better understand the backflow procedures and requirements. In addition, as part of our on-going efforts to ensure the safety of your drinking water, we are required to protect our system against cross-connections. Cross-connections can make our drinking water unsafe. We have included a questionnaire to help determine if you have any special plumbing or activities that pose an increased risk of contamination to our water system. Please take the time to fill out our questionnaire and return it to City Hall. Thank you.