How to Clean Underground Water Tanks Safely: Expert Tips and Common Mistakes to Avoid

Water tanks buried underground offer a continuous supply of clean, safe water for homes, buildings, and commercial facilities. Unfortunately, because these particular tanks are out of sight, over time, they tend to collect sediment, sludge, bacteria, and algae that could contaminate the water if the tanks are not cleaned appropriately. A deeper understanding of how to clean underground water tanks is important in maintaining high water quality, be it serving drinking water, domestic use, or irrigation.

This guide explains the underground water tank cleaning procedure, best practices, when to schedule cleaning, and how professional services in the UAE handle the process.

Why Underground Tank Maintenance Matters

Maintenance of underground water tanks is not just about the clarity of the water; it’s about safety. Over time, sediment, mineral deposits, and organic matter settle at the bottom of tanks. This buildup encourages bacterial growth and can lead to serious water quality problems. Regular disinfection of an underground tank prevents such contamination and extends the life of your water storage system. Understanding why water tank cleaning is important helps property owners prioritize this essential maintenance task.

How Often Should Underground Water Tanks Be Cleaned?

Cleaning frequency is determined based on factors related to the quality of the water source, the storage tank material, and usage patterns. Generally:

1. Residential tanks: Every 6-12 months
2. Commercial properties: Every 3-6 months
3. GRP/fiberglass tanks: Every 6-12 months (these materials resist contamination better)
4. Concrete tanks: Every 4-6 months (more prone to algae and sediment buildup)

How to Clean Underground Water Tanks Step by Step

Step 1: Preparation for Cleaning

Before commencing the underground water tank cleaning procedure followed by UAE professionals, ensure you have:

• Drainage pumps
• Pressure washing equipment
• Safe disinfectants for underground water tanks
• Protective gear (gloves, boots, masks)
• Proper lighting for inspection

Step 2: Complete Water Drainage

First, the tank has to be completely drained. All water is removed from the tank using submersible pumps until it is completely empty. This permits proper sediment removal from underneath the tank.

Step 3: Underground Water Tank Inspection

Once empty, inspect the inside of the tank thoroughly. Check for:

• Cracks or structural damage
• Corrosion signs, especially in older tanks
• Areas with heavy algae or bacterial growth.
• Leaks or water seepage

Step 4: Removing the Sediment and Debris

It is necessary to manually scoop out sediment, sludge, and debris at the bottom and sides of the tank. For GRP/fiberglass water tank maintenance, soft brushes should be used to avoid scratching the interior surface. These GRP tanks offer superior corrosion resistance and hygienic storage capabilities compared to traditional materials. Concrete tanks might need more vigorous scrubbers to remove underground tank sediment.

Step 5: High-Pressure Washing

Clean all interior surfaces with pressure washing equipment. It removes firmly attached algae, biofilm, and mineral deposits that cannot be cleared by manual cleaning. Pay particular attention to corners, pipe connections, and the tank ceiling where contaminants usually accumulate.

Step 6: Underground tank disinfection

Apply approved disinfectants that are specifically designed for potable water systems. The most effective safe disinfectants for underground water tanks include:

• Chlorine solution – carefully measured concentration
• Hydrogen peroxide-based sanitizers
• EPA-approved water tank disinfectants

Step 7: Final Rinse

Thoroughly rinse the tank several times in clean water to remove traces of disinfectant and loosened contaminants. Continue until the water is completely clear.

Step 8: Water Quality Testing

Before refilling for use, water quality tests should be conducted to ensure that the tank is safe. Professional underground water tank cleaning services in Dubai include laboratory testing in their comprehensive service.

Signs Your Underground Water Tank Needs Cleaning

Knowing when your tank needs attention can help you avoid major problems. Look for these warning signs:

1. Unusual taste or odor in your water supply
2. Discolored or cloudy water coming from taps
3. Sediment or particles visible in water
4. Reduced water pressure across your property
5. Algae growth visible near tank openings
6. Unexplained rise in water consumption-possible leaks

If you notice any of these, it’s time to schedule professional underground water tank cleaning services.

Common Mistakes When Cleaning Underground Water Tanks

Avoid these common mistakes that can compromise cleaning effectiveness:

1. Use of chemical treatment not approved for potable water systems
2. Poor rinsing, leaving active disinfectant residue
3. Skipping the inspection phase and missing structural issues
4. Insufficient drying time prior to refilling
5. Not testing the water quality after cleaning
6. Cleaning by oneself in confined areas without proper safety equipment

Professional cleaning companies follow strict safety protocols and use approved equipment to avoid these pitfalls.

Professional vs. DIY Cleaning

While being informed about the cleaning process is good, professional underground water tank cleaning possesses several advantages:

• Specialized Tank Cleaning Equipment- UAE Standards require
• Trained technicians experienced in confined space safety
• Comprehensive inspection identifying potentials for problems.
• Effective disposal of polluted water and waste
• Certification and compliance with local regulations
• Insurance to cover any issues during cleaning

Atlas Al Sharq’s professional cleaning services meet all Dubai Municipality standards and employ certified technicians with years of experience.

Underground Water Tank Cleaning Cost in UAE

Professional services usually range from AED 500 up to AED 2,000, depending on:

1. Tank size and capacity
2. Level of contamination
3. Tank accessibility
4. Material type (concrete, GRP, fiberglass)
5. Additional services: repairs, coating, leak detection

A maintenance contract for an underground water tank generally offers better value, including regular scheduled cleaning and priority service. Choosing the right tank size from the beginning also impacts long-term maintenance costs.

How to Prevent Bacteria Growth and Water Tank Contamination

Cleanliness of underground water tanks between scheduled maintenance is very important to avoid bacterial growth and contamination. Sealing all access points, proper and efficient filtration at incoming water lines, and good ventilation without allowing debris into the tank will help. Also, regular monitoring of water levels should be performed to prevent stagnation.

GRP and fiberglass tanks are ideal for long-term storage due to their smooth, non-porous interior that resists bacterial buildup compared with concrete tanks. Maintain the area around the tank clean; ensure proper drainage around the facility or yard to prevent standing water; and use secure, lockable covers to help minimize external contamination.

Inspections should be performed every 3–6 months, with immediate leak repairs to avoid groundwater intrusion. These preventive measures greatly minimize the risk of contamination and can extend the timeframe between professional cleaning events.

Choosing the Best Underground Tank Cleaning Company

What to Consider When Choosing Water Tank Cleaning Dubai/UAE Services:

1. Certification and licensing from relevant authorities
2. Experience with your tank type: GRP, fiberglass, concrete
3. Comprehensive service offerings: inspection and testing
4. Confined space work, safety protocols
5. Customer reviews and references
6. Transparent pricing and detailed service contracts

Conclusion

Proper cleaning of underground water storage is an integral part of maintaining healthy, safe water supplies. Whether you choose professional underground water tank cleaning services or undertake maintenance yourself, following the correct underground water tank cleaning procedure UAE standards mandate ensures your water remains clean and safe. Regular maintenance will protect your investment, along with professional inspection and promptly addressing any problems that arise to safeguard health for those relying on your water system.

For professional underground water tank cleaning in Dubai, Abu Dhabi, and across the UAE, look no further than Atlas Al Sharq for expert assessment and comprehensive cleaning solutions tailored to your specific needs. Our additional services include GRP lining and waterproofing and GRP pipe joint lamination for complete water system protection.