Clean, Protect and Maintain Your Cistern Click here for printable brochure Each MMWC customer is responsible for maintaining, cleaning, and disinfecting his or her cistern. The animated tutorial below describes a typical cistern setup and its critical components:
Cistern-cleaning professionals: Kevin Karloske (CCME resident) 719-689-2717 (H) 707-321-5090 (C) Disclaimer: MMWC provides referrals as a convenience to its customers.  MMWC makes no warranties or guarantees regarding the workmanship of any referral You should have your cistern cleaned and inspected every year. Over time, dirt collects on the bottom of the cistern, and microbes grow on the cistern walls. To keep your cistern disinfected, add about 1 ounce of 5-6% unscented liquid household bleach for every 200 gallons in your cistern, once a week. But don’t overdo it — bleach is bad for your septic system. To avoid the risk of being overwhelmed by chlorine fumes, consider hiring a professional to clean your cistern. The following guide from the Centers for Disease Control provides useful information on disinfecting and sanitizing your cistern: http://www.cdc.gov/healthywater/emergency/safe_water/cisterns/disinfection_cisterns.html You should have a tight-fitting inner lid to your cistern box. If yours is broken, or if you don't have one, get one! Your concrete riser (manhole) should be properly sealed to the cistern box, to prevent heavy rains from seeping through the joint into your cistern. The top of your cistern’s concrete riser (manhole) should have at least 6-8” of ground clearance to keep rainwater runoff out. Your cistern’s float valve is above the water level in your cistern, and can freeze shut during the winter. Install a heater in the cistern ring during the winter to prevent such an incident. The property owner is responsible for any repairs from the connection with the water main. This includes cisterns and service lines, which can crack; valves, which can corrode; and your pump and pressure tank, which can fail. The float valve is the most critical component. If it fails or gets stuck in an open position, your cistern will overflow. It should be replaced at least every 10 years. Check your water usage and periodically look at your cistern and the area around it. Make sure there is no water and that the ground does not “look wet”. If you notice dampness or water, call the office. Copyright © 2009-2011 MMWC Director Eric W. Cernyar