The tanks should be examined at an interval of five years and there should be a written report justifying the condition of the structural integrity and the quality of water in the tank. Water tanks should be thoroughly examined to assess the condition of screens, holes, antennas and cathode protected installs (if any). The inspecting body should either be a firm employing inspectors trained in sanitary aspects or an experienced individual who is licensed to do sanitary water tank checks.
Water from the water tanks in your home should be sampled twice a year for presence of coliform microorganisms and fecal bacteria. Getting an heterotrophic plate count (HPC) done is the best way to do a coliform analysis.
Things You Can Do
Call a trained workman and get a couple of purely operational valves installed which will isolate your water tanks from the public distribution system. You should ensure that there is a drain valve and adequate pipes of appropriate sizes which will drain away the tank in a specific period of time. There should be a sampling tap which can draw out samples from the huge bulk of water as this tap will be useful in times of sanitary checks.
You can also invest in locking hatches, ladders to boost security, fences to protect against vandalism etc.
Things To Consider Before You Replace Your Water Tank
The above mentioned conditions merely indicate situations where it will be very difficult to continue using the old water tanks without compromising on hygiene and safety. However this does not mean that you get your tank replaced every time a bolt falls off or a layer of dirt accumulates. It’s advisable to get your tank cleaned at regular intervals so that they last longer. You should also hire an expert plumber to inspect the condition of your water pipe connections from time to time. With proper cleaning and maintenance processes a rain water tank can last for a period of more than 5 years without any serious issues.