How often should water storage tanks be cleaned and inspected?

• A. Every year
• B. Every 2 years
• C. 3-5 years
• D. 10 years

Answer: (C)

Regular maintenance of water storage tanks is essential to remove sediment, prevent biofilm, and check coating and structural condition so water quality stays safe. The standard interval of cleaning and inspection is every 3-5 years. This window balances ensuring you catch buildup and any coating deterioration before issues arise, with keeping maintenance manageable in terms of cost and labor. If water quality is poor, tanks have heavy sediment, or coatings show trouble, more frequent checks may be needed; but waiting longer than about five years increases the risk of contamination and more extensive repairs. Cleaning yearly or every 2 years is typically more frequent than necessary for most systems, and waiting 10 years is too long.