8 Water Tank Cleaning and Maintenance Mistakes To Avoid

In industrial operations, clean and well-maintained water tanks are essential for safety, efficiency, and regulatory compliance. Despite best efforts, even minor oversights during cleaning or inspection can lead to costly problems like contamination, corrosion, or system failure.

These issues not only disrupt production but can also compromise the quality of the water or materials stored inside. Recognizing the most frequent water tank cleaning and maintenance mistakes to avoid helps teams take a proactive approach and reduce long-term risks. With careful attention and proper planning, you can protect both your equipment and your bottom line.

1. Neglecting a Formal Maintenance Schedule

One of the most significant errors is treating maintenance as an afterthought rather than a planned activity. An inconsistent, "run-to-failure" approach leads to surprise breakdowns, emergency repairs, and unplanned downtime. This reactive cycle is almost always more expensive and disruptive than scheduled upkeep.

To avoid this, create a comprehensive maintenance schedule based on tank type, age, usage, and environmental conditions. Your schedule should follow American Water Works Association (AWWA) standards, which generally recommend a complete inspection of all tank components at least every three to five years.

You should plan regular cleanings, or washouts, to manage sediment and biofilm. Documenting this schedule and assigning clear responsibility creates a framework for consistent care.

2. Overlooking Sediment Accumulation

Sediment, including sand, silt, and mineral precipitates, naturally settles at the bottom of a water tank. Allowing it to build up can cause multiple problems. It provides a habitat for microbiological growth, which can degrade water quality and introduce unpleasant tastes or odors. Furthermore, this layer traps moisture against the tank floor, creating an oxygen-depleted environment that accelerates corrosion under sediment.

Regularly scheduled washouts are the primary method for managing sediment. The frequency depends on the quality of the source water, but it should typically occur every few years. During a cleaning, trained crews remove all accumulated material and properly dispose of it to restore the tank to a clean state.

3. Ignoring Corrosion and Coating Failures

The protective coating on a tank's interior and exterior surfaces is its primary defense against corrosion. Small chips, blisters, or areas of peeling paint may seem minor, but they expose the underlying steel to the elements. Once corrosion begins, it can spread rapidly, compromising the tank's structural integrity from the inside out.

Avoid this mistake by performing regular visual inspections of the coating system. Look for any signs of failure, chalking, or rust staining. When damage is found, you or a professional should repair it promptly and in accordance with the coating manufacturer's specifications.

A comprehensive inspection by a certified professional can identify early signs of coating breakdown before they become major structural issues. Staying diligent with inspections saves significant costs on complete recoating projects.

4. Using Improper Disinfection Procedures

After any cleaning, repair, or maintenance activity that involves entry into the tank, proper disinfection is non-negotiable. Failure to follow correct procedures can introduce harmful contaminants into the water supply, posing a serious public health risk. Simply adding chlorine without a clear methodology is insufficient and dangerous.

Strictly adhere to AWWA Standard C652 for Disinfection of Water-Storage Facilities. This standard outlines the specific methods, chlorine concentrations, and contact times required to effectively neutralize bacteria and viruses. Following disinfection, you must collect and test water samples through a certified laboratory to confirm the absence of coliform bacteria before returning the tank to service.

5. Failing To Follow Confined Space Entry Protocols

The Occupational Safety and Health Administration (OSHA) classifies water tanks as permit-required confined spaces. These environments present serious hazards, including toxic atmospheres, engulfment risks, and physical dangers. Sending personnel into a tank without following strict safety protocols can be fatal.

All work inside a tank must comply with OSHA's confined space standard (29 CFR 1910.146). This includes developing a written entry permit, testing the atmosphere for oxygen content and hazardous gases, implementing proper ventilation, and having a trained attendant and rescue team on standby. Never allow untrained or unequipped personnel to enter a tank for any reason.

6. Poor Record-Keeping and Documentation

Without detailed records, it is nearly impossible to track a tank's condition over time or make informed decisions about future maintenance. Missing documentation can lead to redundant inspections, overlooked repairs, and a lack of historical context when problems arise. This makes it difficult to budget accurately or justify maintenance expenditures.

Maintain a comprehensive file for each tank that includes all design and construction documents, inspection reports, photos, repair histories, coating specifications, and disinfection records. This centralized logbook provides a complete picture of the asset's life cycle. It serves as an invaluable tool for planning, regulatory compliance, and transitioning knowledge between facility managers.

7. Inadequate Preparation for Seasonal Changes

Extreme weather, from freezing temperatures to high heat and humidity, places unique stresses on water tanks. Without proper preparation, winter can cause ice damage to interior components and coatings, while summer can accelerate corrosion and microbiological growth.

To mitigate these risks, conduct seasonal inspections. Before winter, check that heating systems and tank mixers are operational to prevent ice formation. Verify that vents are clear of debris and functioning correctly.

Before summer, inspect coatings for any damage that could worsen because of heat and UV exposure. Adjusting maintenance activities to the season helps protect the tank year-round.

8. Choosing Unqualified Contractors

Selecting a contractor based solely on the lowest bid is a critical mistake. Inexperienced or unqualified firms may lack the specialized equipment, safety training, and technical knowledge required for tank maintenance. This can result in substandard work, safety violations, and long-term damage that is far more expensive to fix. Each business has varying capabilities, and standards vary widely.

Develop a thorough vetting process for contractors. Verify that the water tower maintenance company you choose has extensive, documented experience with the specific tank type and the required work. Check for certifications (like AWWA, NACE, or SSPC), a strong safety record, and adequate insurance coverage. Request and contact references from other municipalities or industrial clients to confirm the quality of their work.

Proper water tank maintenance protects your equipment, your product, and your operational reliability while meeting safety regulations. By understanding the most common water tank cleaning and maintenance mistakes to avoid, you can prevent unnecessary downtime and extend your system's lifespan.

If you are responsible for large municipal or industrial tanks, partnering with an experienced team can set you up for success and avoid the mistakes above. Pittsburg Tank and Tower Group offers expert cleaning, inspection, repair, and maintenance services tailored to demanding environments. Contact our specialists today to discuss your maintenance needs and keep your water storage assets working reliably.