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This oil tank information article series answers nearly all questions about above ground or buried oil storage tanks including oil tank installation, abandonment, removal, leak testing, leak prevention, and regulations. We also provide details for heating oil storage tank installation, piping, controls, valves, and and oil storage and piping system repairs.

Residential & Small Commercial Oil Storage Tank Information Website

Here we provide authoritative, extensive free un-biased oil storage tank inspection and testing advice for property buyers and owners. This document lets you know what to ask about oil storage tanks, what oil tank leak tests to order, how to interpret oil tank testing results, what to do if there is a buried fuel or petroleum storage tank at a property, what to do if there is or was a leaky oil storage tank or petroleum storage tank, and how to reduce the chances of an oil leak or oil spill in the future.

We include detailed information about underground (buried) oil storage tanks (USTs), aboveground oil storage tanks (ASTs), above ground fuel storage tanks, reporting and cleaning up oil tank leaks, and choosing among oil tank leak testing methods.

We discuss how to find buried oil tanks, how to remove or abandon oil tanks and how to recognize evidence that there was a previous oil tank at a property even if the oil tank may have been removed (or perhaps left buried in place). We discuss what to do if an oil tank has already been removed or abandoned.

We provide links to every U.S. state regulatory agency concerned with oil and other storage tanks and to regulatory agencies in Canada and other countries. Environmental damage from oil leaks, oil spill cleanup, are also discussed. We discuss oil spill cleanup, oil spill and odor remediation, and bioremediation, for fuel oil or heating oil.

LP Gas tanks are also addressed. Home heating oil tank leak and environmental contamination risks are important concerns for building owners and home buyers as major cleanup and tank replacement costs can be involved.

© Copyright 2012 InspectAPedia.com, All Rights Reserved. Information Accuracy & Bias Pledge is at below-left. Use page top links to major topics or use links at the left of each page to navigate within topics and documents at this website. Green links show where you are in a document series or at this website.

Home Owners & Home Buyers' Guide to Oil Storage Tanks

Home buyers should be sure to review the following articles:

1. OIL TANK TESTING - Leaky Heating Oil Tanks - How Oil Tanks are Tested for Evidence Leaks, of Current or Previous Oil Spills
2. OIL TANK LEGAL ISSUES - Home Buyers and Home Owners Guide to Leaky Heating Oil Tanks - What to Do
3. Leaky Heating Oil Tanks - When to Report Oil Tank Leaks.
4. OIL TANK ABANDONING PROCEDURE Home owners who have old oil tanks above ground or any age oil tank below ground should also be sure to review these procedures and regulations for Abandoning Commercial vs. Residential Underground Oil Storage Tanks (UST)
5. Septic Tanks can present potentially fatal collapse hazards as well as expensive surprises.

GOT AN OIL TANK ? - What if an oil storage tank is or was installed at your property?

Buried oil tanks raise increasing environmental, safety, legal and economic concerns for home owners and home buyers because oil leaks underground or even within buildings can lead to both environmental damage and very costly cleanup operations.

Having to install a new above ground indoor oil storage tank involves significant expense, perhaps $2000. to $4000. to remove the old tank and install the new one.

Removing or abandoning a buried oil tank is more costly. If an oil tank has leaked the cost to clean up contaminated soils can be very significant, so much so that a property buyer should not complete the purchase before questions about the condition of oil tanks, past or present at the property, and the chances of leaks from buried oil storage tanks have been answered satisfactorily.

Home heating oil tanks are excluded from Federal Regulations about oil storage tank reporting and monitoring, but in almost every U.S. state or Canadian province, storage tanks are addressed by state or local DEP/DNR/DEC agencies and regulations. For example, in New York, even residential storage sites must be reported to the state DEC if more than 1100 gallons are stored at a single site. (A few U.S. states specifically exclude the regulation of storage tanks when used for home heating oil.)

In any case, should a home heating oil tank causes a release of oil into the environment, at that point the owner of the tank is not exempt from the other provisions of the State or Federal Regulations: the leak needs to be reported (often within two hours of observation), the source of leak/spill would have to be stopped, a site characterization would have to be completed, and appropriate corrective action (cleanup) would have to initiated, and the incident would have to be reported.

Above ground oil tanks and clues for the presence of buried oil tanks are not usually examined during a pre-purchase home or building inspection unless specific prior test arrangements have been made.

Oil tank inspection, other than casual visual inspection for obvious leaks is not performed by such inspectors.

Oil tank tests for leaks, soil tests for oil contamination, soil tests for corrosivity, screening for evidence of prior or abandoned oil storage tanks, as well as oil storage tank removal or abandonment require that you use an appropriate expert.

However articles at this website outline easy on-site visual observations that any thoughtful observer can make to spot evidence of a present or previous buried tank and to spot evidence of leaks or other problems with above ground storage tanks.

From a previous use, a buried oil tank may be present or may have been present at a property now served by an indoor, above ground oil tank or even by LP or natural gas.

So don't assume that because you don't see a tank that none was ever used or present at a property.

If you just "scroll down" you'll miss some important articles. See links at page left.

Tank Removal Funding Assistance is available in some municipalities. See TANK REGULATIONS at page-left to find individual state or provincial agencies concerned with oil storage tanks.

Before completing purchase of a property that has or had a buried oil tank you need to have either had the tank removed, abandoned in place, or tested.

At end of the day, you need reliable documentation that shows that either there has been no leakage and a proper tank abandonment has been performed, or if there was leakage, that a proper cleanup has been performed.

If the oil storage tank is a newer buried model (perhaps a fiberglass or multi-walled oil storage tank) and if the oil tank is in good condition it may not need to be abandoned.

But if older oil storage tanks were used, were removed, or remain abandoned at the property you still need to satisfy the requirements of this paragraph. The discussion which follows explains the risks and gives detailed advice about what to do about buried or above ground oil tanks and tank leaks.

OIL TANK LIFE - Life Expectancy of Buried or Underground Oil Tanks

While we've found them lasting longer, a common life expectancy of buried oil tanks is 10-15 years. At about 20 years, the risk of leaks from buried steel oil tanks becomes significant. Leaks can occur earlier if a tank was damaged at installation or was not properly piped.

Even if you think the tank is ok, young, and not leaking, buried oil tanks, should be tested for water in the tank bottom. Water should be pumped out since it corrodes the tank and leads to leaks. Oil tank leaks can also be due to damage at time of installation, improper installation, corrosive soils, or piping defects. If the tank is to remain in use, ask your fuel supplier about using an additive or other methods to help remove water.

In New England for a two year period [1984-5] among customers who have buried heating oil tanks (16% of total customers) surveyors found an average of 1.7 tank leaks per thousand customers. They also found 2.5 fuel line leaks per 1000 customers. (Fuel Oil and Oil Heat magazine, August 1985 p.18.) We do not have similar data for buried gas tanks in residential application. See OIL TANK LIFE for details about the life expectancy of oil tanks.

The rate or frequency of oil tank leaks or oil storage tank failures, focused on underground storage tanks or USTs, is discussed in detail at TANK FAILURE RATES Oil Tank Failure Data - Oil Tank Failure Rates - Oil Tank Leak Probability as a Function of Tank Age, Location, Condition, Soil Conditions and Other Factors.

TANK REGULATIONS outlines who, when, and how oil leaks and spills must be reported to environmental authorities.

LEAK CAUSES - Oil Tank Leak Failure Causes

Below we present a summary of this topic. Details about the causes of oil tank leaks can be read at OIL TANK LEAK CAUSES Sketch courtesy of Carson Dunlop.

In-Tank corrosion of oil storage tanks: Underground fuel or heating oil storage tanks usually fail from rust perforation due to several effects of water inside the tank including, in the case of heating oil, combination of water with sulphur in the fuel, bacterial action, and other factors.

External rust on oil tanks, unless very heavy, isn't highly correlated with internal rust. Leaks can occur due to tank damage or at piping connections.

Oil Tanks in Corrosive Soils: Oil storage tank leaks are more likely if a steel tank has been buried in corrosive soil or if the tank was damaged during installation, such as gouging it or bouncing it off of a rock as it was placed into a hole for burying.

Oil Tank Piping Leaks: Oil tank leaks may occur at buried piping connections as well.

Delivery Oil Spills: occur around the tank fill pipe and range from trivial to more extensive requiring soil removal and cleaning. These leaks are usually obvious at the ground surface around the oil tank or tank filler.

Inadequate fill or vent pipe diameter is blamed by some for leaks at buried or above ground oil tanks, asserting that because oil tanks are filled under pressure from the oil delivery pumper-truck, a corroded, damaged, or poorly-plumbed oil storage tank, or one with a too-small vent opening, may not withstand the pressure of the filling process.

Indoor oil spills during tank fill or later from a leaky oil tank range from trivial local cleanup and deodorizing efforts to very serious contamination problems if an oil tank bursts during oil delivery (which I suspect is rare) and on occasions when an indoor oil tank has been removed but someone (some fool) has left the oil filler pipe installed on the building, and when subsequently an oil delivery is mistakenly made through the filler pipe onto the empty basement or crawl space floor. This may sound crazy but it actually happens.

Also see OIL TANK LIFE their life expectancy and life factors and TANK FAILURE CAUSES discusses the causes of oil storage tank leaks in more detail.

The rate or frequency of oil tank leaks or oil storage tank failures, focused on underground storage tanks or USTs, is discussed in detail at TANK FAILURE RATES provides Oil Tank Failure Data - Oil Tank Failure Rates - Oil Tank Leak Probability as a Function of Tank Age, Location, Condition, Soil Conditions and Other Factors.

TANK TESTING - Oil Tank Inspection and Oil Leak Testing Choices

Below we present a summary of this topic. Details about oil tank testing procedures and choices can be read at TANK TESTING

Look at the oil tank and site for yourself: Before deciding to hire a tank testing company for professional inspection and testing, some basic information such as the age (property and tank), tank location, and type of oil tank, and for above-ground tanks, a simple visual inspection of the tank and its piping, can give you and idea of the risks involved. Look for obvious leaks such as oil stains on the ground or floor under or around the tank and around the oil fired equipment. Remember to look under the oil tank at its bottom, as most leaks occur in the lower portion of the tank.

Hire an expert: Specialty companies and some oil companies have equipment to test buried tanks for leaks. Soil testing, simple low-psi pressure-testing and sophisticated electronic testing are commonly used. I advise home buyers to have a soil test performed rather than a pressure test of an existing oil tank, since even if the tank is not currently leaking we would prefer an assurance that it didn't leak before, say from a plumbing connection that was repaired.

In addition to oil tank inspection, oil piping inspection, and oil tank testing to "pass" or "fail" an oil storage tank, more sophisticated tests are available to assess the chances that an existing heating oil storage tank has leaked or is likely to have a serious leak soon. These include a oil tank corrosion analysis which adds to the basic tank inspection and tests an assessment of the level of corrosion of the tank walls and thus the chances of its leaking or failure, and soil corrosion or soil corrosivity evaluation which includes an evaluation of soil samples collected from around the tank in order to assess the degree to which the soil in which the oil tank has been buried will contribute to the process of corrosion of the (presumably steel) buried oil tank.

Also see TANK TESTING and OIL TANK LIFE

Testing Oil Storage Tanks for Water Contamination

Below we present a summary of this topic. Details about handling water in oil tanks can be read at OIL TANK WATER CONTAMINATION

Testing for water in an oil tank (above ground oil tanks whether inside or outdoors, or buried oil tanks) is simple and can be done by any service person or even a homeowner. Tank testing methods vary in risk to the tank, cost, invasiveness, length of time to complete, and more. Since water in a heating oil tank can lead to loss of heat and related building damage we want to know if in-tank water is a problem at a given property. There are several steps and test methods for finding water in an oil tank and for determining how much of a problem it is.

Water can enter a heating oil storage tank by several means

OIL SPILL, Oil Tank LEAK CLEANUP - Oil Leak/Spill Cleanup Companies Listing

Details about oil spill or oil tank leak, cleanup, remediation, prevention, training, and regulations are found at OIL SPILL CLEANUP / PREVENTION and at OIL TANK LEAK CLEANUP GUIDE. Excerpts are below.

TESTING COs / REMOVAL COs - Oil Tank Testing, Removal, Consulting Environmental Service Companies

Oil Spill Secondary Containment and Oil Spill Remediation

Oil Tank Removal or Abandonment Methods

Details about oil storage tank removal or abandonment methods are at OIL TANK ABANDONING PROCEDURE. A brief summary is below.

There are also proper methods of "abandoning" old unused buried tanks without actually excavating and removing them (provided there is not evidence of leakage). If a tank is not to be used, can involve significant expense. A proper abandonment procedure involves pumping out remaining fuel, confirming that there has been no leakage, cleaning the tank, and filling the tank with an approved filler, or removing it entirely. These measures, if required, involve significant expense.

Buried tank removal is handled by environmental services companies. Usually the specialist arranges testing, excavation, and disposal. Or tanks can be abandoned in place.

Environmental Issues & Regulations for Oil Tanks

Details about oil storage tank rules, standards, guidelines, and regulations are at OIL TANK REGULATIONS A brief summary is below. Also see OIL TANK LEGAL ISSUES.

In the U.S. and many other countries state DEP/DEC/DNR (Departments of Environmental Conservation or similar agencies) have programs for registering buried tanks at any site storing (typically) more than 1100 gallons of heating oil. Requirements for gas (auto fuel), or other fuels may be different. Eventually this concern may spread to smaller residential tanks. The concern is for leaks which contaminate the environment. Tanks located where they may leak into a local waterway or into the water supply are a special environmental concerns. (C)trap DJ Friedman.

Questions & Answers regarding this article

Questions & answers about oil tanks: ASTs, USTs, oil tank life, oil tank regulations, leak testing, buried oil tank abandonment, oil tank removal, oil tank leak prevention, spill cleanup, oil piping, oil filters, oil tank regulations

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OIL TANKS INSPECT LEAK TEST ABANDON REGS

• Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. (416) 964-9415 1-800-268-7070 info@carsondunlop.com. Thanks to Alan Carson and Bob Dunlop, for permission to use illustrations from their publication, The Illustrated Home which illustrates construction details and building components. Carson Dunlop provides home inspection education including the ASHI-adopted Home Inspection Training Program (home study course), publications such as the Home Reference Book, report writing materials including the Horizon report writer, and home inspection services. Alan Carson is a past president of ASHI, the American Society of Home Inspectors.
• NFPA - the National Fire Protection Association can be found online at www.nfpa.org

Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair

• Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Also see our Book Reviews - InspectAPedia.
• Reading and advice about oil storage tank leak testing
  • ABOVE GROUND OIL TANK INSPECTIONS - "Visual Inspection of Above Ground Residential Heating Oil Storage Tanks - ASTs" provides photos of common and easily seen tank leaks and defects, and a description of some easy visual checks of the condition of a visible oil tank, things that you can do yourself
  • OIL TANK TESTING Oil Tank Testing Methods & Choices
  • BURIED OIL TANKS, FINDING How to Find Buried Oil Tank
  • OIL TANK FAILURE CAUSES Oil Tank Leaks or Oil Tank Failure Causes - oil tank leaks are caused by corrosion, damage, soil conditions, other factors
  • TANK FAILURE RATES Oil Tank Failure Rates - Oil Tank Leak Probability as a Function of Tank Age, Location, Condition, Soil Conditions and Other Factors
  • OIL TANK WATER CONTAMINATION - how to find out if there is problematic water in an oil tank and how to get water out of an oil tank are explained
• Oil Tanks - The Oil Storage Tank Information Website: Buried or Above Ground Oil Tank Inspection, Testing, Cleanup, Abandonment of Oil Tanks
• Abandon a Buried Oil Tank, How To - Abandoning Commercial Underground Tanks, Russ Brauksieck, ASHI Tech. Journal, Vol.3 No.1 Spring 1993, P. 40-41 [Reprint]
• Above Ground Oil Tanks: Visual Inspection of Oil Storage Tanks for evidence of leaks, damage, improper piping - photos and text
• Above Ground Oil Tanks Checklist, an Oil Company's advice
• Above Ground Tanks UL Standards, UL Tank Listing Standards, guidance for home owners, buyers, and inspectors
• Buried Oil Tanks - Finding How to Find Buried Oil Tanks and "Nearly Hidden" and Leaky Oil Tanks - photos and text.
• Buried Fuel tank - Advice - Buried FUEL Tank - GAS or OIL advice for home buyers, home owners, inspection report language for homes where a buried oil tank is or was installed
• Environmental Issues & Regulations for Oil Tanks, Registration, Abandonment, Leak Reporting
• Home Inspection Report Language Library: Buried Oil Tanks, Buried or aboveground oil tank advice for home buyers and home owners, where a buried oil tank is or was installed, also home inspection report language for oil tanks
• Home Inspection Report Language Library: Visible Defects in Oil Tank Installations, Tanks, and Heating Oil Piping
• Home Inspection Report Language Library: Gas Fuel Piping or Tank Faults Basic advice - home inspection report language suggestions
• Home Inspection Report Language Library: Oil Tanks text file list © Oil and Other Storage Tank Leaks, Testing, Abandonment, Inspection - UST home inspection report language files - Reference List
• Indoor Environment Website Indoor Building Environmental Hazard Detection, Testing, Repair, & Prevention - Main Web Page
• Leaky Heating Oil Tanks - Advice for Home Owners or Buyers: caused of leaks in oil tanks, oil tank testing alternatives, what to do about leaky tanks: D. J. Friedman, ASHI Tech. Journal, Vol.2 No.1, Winter, 1992 p. 42-43 Illus
• Leak or Failure Rates for Home Heating Oil Tanks
• Legal Issues Regarding Buried Oil Storage Tanks K. S. Rea, Attorney, summary from ASHI Chapter Seminar.
• Primer on Petroleum Bulk Storage Tanks & Petroleum Contamination of Property Paul H. Ciminello, ASHI Tech. Journal, Vol.3 No.1 Spring 1993, p 35-39
• Petroleum Bulk Storage J. Sibblies, NY State DEC, Advice to Home Owners and Home Inspectors about Oil Storage Tanks - summary from ASHI Chapter Seminar.
• Septic Tank inspection, testing, diagnosis, repair
• OIL TANK FAILURE CAUSES - Oil Tank Failure Causes - oil tank leaks are caused by corrosion, damage, soil conditions, other factors
• Tank Failure Rates - Oil Tank Failure Rates - Oil Tank Leak Probability as a Function of Tank Age, Location, Condition, Soil Conditions and Other Factors
• OIL TANK TESTING - - How Oil Tanks are Tested for Evidence Leaks, of Current or Previous Oil Spills
• "How do you choose the right tank testing method?", Cynthia Johnson, Fuel Oil & Oil Heat Magazine, November 1995
• National Association of Oil Heat Service Managers, PO Box 380, Elmwood Park, NJ 07407
• "Homeowners Guide to Fuel Storage," Agway Energy Products, Verbank, NY, November 1990
• Web Link Exchange: Contact Us to list your website or contact information for oil tank testing, tank corrosion research, oil industry experts
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