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Instructions for Well Disinfection Page 2 9) Allow the solution to remain in the system for a minimum of eight hours, or overnight. During this time you should not drink, bathe, wash clothes, or cook with the water, but you can use it for toilet flushing. 10) After the solution has remained in the system for a minimum of eight hours, connect a hose to an outside spigot and allow water to run onto the ground for 20-30 minutes to remove the chlorine solution from the water system. Try to keep the water away from your drainfield and any plants or trees if possible. After 20-30 minutes, turn off the spigot and then run each indoor and outdoor water faucet for 2-3 minutes to remove the solution that was in the pipes. 11) It is now time to collect the water sample. Remove the screen or aerator from the faucet tip. Submerge the tip of the faucet into a small container of bleach for 30 seconds. Allow the bleach to remain on the faucet tip for 5 minutes. (This reduces the possibility of a false -positive sample reading, as the faucet tip is a potential area of bacterial growth.) Once the faucet tip has been disinfected, turn on the cold water and allow it to run for 5 minutes. While the water is still running, remove the lid from the sample bottle. DO NOT touch the interior of the lid or sample bottle, and remember that the pill or powder substance in the bottle must remain inside the bottle. Fill the bottle to approximately 1/2 inch from the top and replace the lid. Place the screen/aerator back on the fa u cet. 12) Samples that are going to be analyzed by our laboratory must be delivered to our office by 3:00 p.m. Monday through Friday. It is best to collect the sample just before delivery to our office! We recommend that samples be refrigerated or chilled while stored or transported. On dates prior to holidays, no samples will be accepted. 13) If well disinfection and resampling was required as part of a Time of Sale inspection, the follow-up sample (after disinfection) must be obtained by either a registered well driller or a Washtenaw County Certified Time of Sale Inspector. 14) If you receive a notice that your sample is positive for coliform bacteria, or if you have any questions regarding the well disinfection procedure, please contact a Washtenaw County Sanitarian at (734) 222-3800. For More Information: 60UAt- Washtenaw County Department of Public Health Environmental Health Division �++ Adl6k,: ca 705 N. Zeeb Rd., P.O. Box 8645 SV 1r= Ann Arbor, MI 48107-8645 b.Jj ``�a� (734) 222-3800 f826 www.ewashtenaw.org Disclaimer: This procedure is intended to be used for chlorinating 5" PVC wells with submersible well pumps. If your well is equipped with a jet pump (either shallow or deep), or if your casing is 4" steel or smaller, we advise that you consult with a licensed well driller prior to chlorination. These instructions are provided as public information based on conditions found in Washtenaw County. There is no implied guarantee and the procedure may have to be repeated. Washtenaw County accepts no responsibility for the outcome, or for any damage incurred. Rev. 10/10