Oil Tank Safety & Risks

Why should unused above-ground oil tanks be removed?

Above-ground oil tanks located in basements, garages, or crawl spaces that are no longer in use should be removed. Many homes convert to natural gas or propane but leave the old oil tank in place.

Unused tanks are more vulnerable to condensation and corrosion. Even when a tank is considered “empty,” oil residue and sludge remain inside. This residue can create a fire hazard and eventually lead to leaks.

Homeowners insurance companies often require removal of unused tanks, and removing them also frees up space.

Do heating oil tanks eventually leak?

Yes. Moisture, condensation, corrosion, erosion, and natural aging weaken tanks over time.

Both underground and above-ground tanks eventually deteriorate. The issue is not whether a tank will leak, but when.

Replacing or removing older tanks before failure reduces the risk of a major spill.

What responsibilities come with owning a heating oil tank?

A leaking oil tank can create serious fire, health, and environmental hazards. Spills may contaminate groundwater, private wells, nearby drinking water supplies, indoor air, and areas beneath a basement floor.

Homeowners are legally responsible for maintaining their tank, cleaning up leaks or spills, and reporting releases that could cause property damage or environmental risks.

Cleanup can cost thousands of dollars and may not be fully covered by homeowners insurance or covered at all.

How can homeowners reduce the risk of oil tank leaks?

Using licensed contractors and inspecting tanks regularly can reduce the risk of leaks.

Recommended steps include:

• Inspect the tank regularly

• Replace tanks that are still in use periodically, with a double wall tank

• Remove underground tanks or replace them with above-ground tanks

• Hire professionals to remove tanks that are no longer being used

Buying or Selling Property With an Oil Tank

Why are underground oil tanks a concern for home buyers?

If an underground oil tank is present, buyers should evaluate the risk carefully. A tank may be leaking now or may have leaked in the past.

The only reliable way to confirm contamination is independent soil testing. Testing can be performed during tank removal or through soil borings beforehand.

Without testing, no one can assume the tank has not leaked.

Can a home still be sold if an oil tank has leaked?

Yes. Many properties can still be sold after a leak. The extent of contamination must be determined, cleanup costs estimated, and the buyer and seller must agree on financial responsibility.

Proper testing and documentation help both parties complete the transaction. However, it is always best to remove an underground oil prior to listing a property for sale. 

Tank Removal & Regulations

Why should you hire a licensed oil tank removal company?

Hiring someone who claims they have removed tanks for years but does not meet Connecticut requirements can cause problems when selling a property.

If the contractor is not licensed and certified, the removal may not meet state regulations and may not produce a valid closure report. Without proper documentation, buyers cannot confirm the tank was removed correctly or that environmental testing was performed.

Hiring a licensed company from the start helps avoid these problems.

What documentation is required when an oil tank is removed?

Tank removal should include environmental testing and documentation. A licensed removal company should provide:

• Soil test results

• A complete closure report

• A certification letter confirming that proper procedures were followed

These records confirm the work met environmental standards and allow the property to be resold without uncertainty.

What certifications are required for oil tank removal in Connecticut?

The Connecticut Department of Consumer Protection requires contractors performing underground tank removal to meet specific qualifications. Contractors must provide:

• $1,000,000 in liability insurance, including pollution coverage

• Completion of a 40-hour Hazardous Materials Incident Response Operations (HAZWOPER) course

• Health and safety training under 29 CFR 1910.120(e)

• Passage of the International Code Council Tank Decommissioning Exam

• OSHA Health and Safety certification

These requirements ensure contractors are trained to handle hazardous materials and environmental risks safely.

What should be done with old oil fill pipes after converting to another heating system?

When a home converts from oil heat to natural gas or another heating system, old oil tanks and fill pipes should be removed or permanently disabled.

If fill pipes remain, fuel may accidentally be delivered into a system that is no longer in use. This can cause major oil spills and expensive property damage.

Proper tank removal should address unused fill and vent pipes to prevent this problem.

Oil Tank Inspection

How can I inspect my own heating oil tank?

Homeowners should periodically check tanks for signs of deterioration. Look for the following:

1. Unstable tank legs or weak foundations

2. Rust, leaks, or wet spots on the tank

3. Black staining near the drain that may indicate water and corrosion

4. Drips around fuel lines, filters, or valves

5. Risk of snow or ice falling on outdoor tanks

6. Vents blocked by snow, debris, or insect nests

7. A working vent whistle during fuel delivery

8. Spills or leaks around fill or vent pipes

9. A cracked or inaccurate fuel gauge

10. Outdoor tanks that are designed for exterior use

11. The age of the tank

Oil Tank Life Expectancy

How long do above-ground steel oil tanks typically last?

Tank life depends on steel thickness and outlet design. Life expectancy for single-wall stell tanks have significantly reduced to the addition of biofuel to the heating oil due to recent years. 

Oil Tank Abandonment

What if an underground tank cannot be safely removed?

Some tanks cannot be removed because of their location, such as:

• Tanks under building additions

• Areas with limited access for heavy equipment

• Situations where removal could damage the structure

In these cases, the tank may be abandoned in place, usually with fire marshal approval. The process typically includes:

• Soil test borings before work begins

• Pumping out and cleaning the tank

• Drilling core samples through the tank bottom

• Filling the tank with flowable fill

This procedure is used only in limited situations. Sand or injected foam are not recommended because sand can absorb water and foam may not support weight as the tank deteriorates.

Cost, Insurance, & Financial Risk

How much does oil tank removal cost in Connecticut?

Costs depend on the tank type, size, location, and whether contamination is present. An onsite tank survey would be performed at no cost for removal or replacement. 

Does homeowners insurance cover leaking oil tanks?

Many homeowners insurance policies provide limited coverage or no coverage for leaking oil tanks.

Policies often include pollution exclusion clauses that exclude environmental contamination caused by leaking tanks.

A separate insurance rider or tank insurance policy may be required at an additional cost. 

Who pays for cleanup if a tank leaks?

If insurance does not cover the damage, the homeowner may be responsible for the entire cleanup.

Because of this risk, real estate professionals and attorneys often recommend removing underground tanks and replacing them with above-ground tanks.

Removing unused tanks early can prevent significant financial liability.

Are there grants or financial assistance programs for leaking oil tanks?

Connecticut previously offered grants and low-interest loans through the Residential Amnesty Program (RAP).

The program ended in 2001 and was not replaced. Homeowners are now responsible for removal and cleanup costs.

Heating Oil Spills

What are some important facts about heating oil tanks and spills?

• More than 40% of oil spills reported annually come from domestic tanks at private homes

• Homeowners insurance may not cover the full cost of cleanup

• Soil and groundwater remediation can cost thousands of dollars