Dave makes a good point
Whether you choose to winterize or not, your fresh water system needs to be recommissioned in the spring along with every other system. Even in climates where boats are used year-round, fresh water systems should be recommissioned at least annually. Here are the directions (I'll repost 'em again in the spring): To assure complete sanitation of your potable water system, it is recommended that the following procedures be used. This applies if it is a used system, one that has not been used for a period of time, or one that may have been contaminated. 1. Prepare a chlorine solution using one gallon of water and 1/4 cup Clorox or Purex household bleach (5% sodium Hypochlorine solution). With tank empty, pour chlorine solution into tank. Use one gallon of solution for each 5 gallons of tank capacity. 2. Complete filling of tank with fresh water. Open each faucet and drain cock until air has been released and the entire system is filled. 3. Allow to stand for three hours. 4. Drain and flush with potable fresh water. 5. To remove excess chlorine taste or odor which might remain, prepare a solution of one quart white vinegar to five gallons water and allow this solution to agitate in tank for several days by vehicle motion. 6. Drain tank and again flush with potable water. The above recommendations conform to section 10.8 in the A-1 192 code covering electrical, plumbing, and heating of recreational vehicles. The solution is approved and recommended by competent health officials.
