Oil Tank Removal in Connecticut

CT DEEP does not regulate residential underground storage tanks serving four or fewer dwelling units. That single sentence explains most of the difference between Connecticut and its neighbors, and it is why guidance written for Massachusetts or Maine misleads here.

DEEP also answers the deadline question in as many words: it does not require a residential heating oil tank to be removed by any specific date, though a leaking tank must be promptly emptied and removed. There is nothing to file and nobody to notify in the ordinary case.

The gap is filled by the building code rather than by environmental law, and by the town rather than the state.

The state's real control point is the certificate, not the tank. Under CGS 20-420(a) a contractor who holds themselves out as performing removal or replacement of a residential underground heating oil storage tank system cannot be issued a home improvement certificate without evidence of a hazardous material training program approved by DEEP and evidence of liability insurance of one million dollars.

The statute stops at that description. It is the Department of Consumer Protection that names which trainings are accepted: OSHA's 40 hour HAZWOPER under 29 CFR 1910.120 with the annual eight hour refresher, and the International Code Council's UST Tank Decommissioning U2 course. Anyone quoting those two names as if they came from the statute is working from the agency page rather than the law.

The requirement dates from Public Act 04-21 in 2004. A surety bond leg was part of it until Public Act 09-122 removed that in 2009, leaving the training and the insurance.

Three checks, and only one of them is a phone call to us or anyone else.

The home improvement contractor registration is public. Look it up on the state's license lookup by name or number, and confirm it matches the number in their advertising, which the law requires them to display, vehicles included. The training certificate and the insurance certificate are not on that lookup, so ask for copies and read the dates, because HAZWOPER lapses without the annual refresher and a policy is only cover while it is in force.

What none of that establishes is competence on your particular property. It establishes that the person clearing your yard has met the bar the state set, which is worth confirming and is not the same claim.

Connecticut's building code is a state code and its enforcement is entirely municipal. CGS 29-263 requires an application to the building official before work starts and bars a permit being issued to a Chapter 400 contractor unless the registration number is on the application. DEEP has no permit of its own and tells owners to ask their town.

So three neighboring towns give three answers. Westport routes residential tank removals through a Building Department mechanical permit. Trumbull requires a Fire Marshal permit with 72 hours of notice and states that the Fire Marshal must witness the excavation. Stamford has no tank ordinance at all, having repealed the one it had in 1988.

There is one thing towns cannot do, which is make the Fire Safety Code apply where it does not. That code reaches detached one and two family dwellings only for smoke alarms and carbon monoxide detectors, so a claim that the State Fire Safety Code governs your basement tank is wrong however confidently it is made.

The residential code amendment at M2201.7 sets three routes and ranks them. M2201.7.1 is the default: where a tank and its piping are abandoned for whatever reason, they are to be emptied, cleaned, removed from the property and disposed of.

M2201.7.3 allows an underground tank to be permanently closed in place, but on nine conditions, beginning with notification of every authority having jurisdiction and including proving the atmosphere safe by instrument and filling the tank completely with an inert solid. DEEP layers its own view on top, discouraging closure in place unless the tank is genuinely inaccessible or removal would endanger a foundation.

M2201.7.2 is the one almost nobody mentions and the one that fits the commonest situation. Where a fuel-burning appliance is converted to another fuel but the tank is kept so it could return to service, four conditions apply: contents removed and vapors purged, the vent line left intact and open, the outside fill pipe removed and the opening capped or plugged, and remaining piping capped or sealed. No deadline attaches to it at all. Maine gives an owner in that position twelve months. Connecticut gives no clock.

DEEP recommends a sample from underneath the tank and piping, analyzed for Extractable Total Petroleum Hydrocarbons at a Connecticut certified laboratory, and a letter report retained for a future sale. Massachusetts attaches a site assessment to every removal by regulation. Connecticut recommends one and leaves it there.

There is still a number behind it. The residential direct exposure criterion for ETPH in Appendix A to the Remediation Standard Regulations is 500 mg/kg, with 2,500 mg/kg applying to industrial and commercial parcels. That is what a result is read against.

The consequence of the recommendation being optional is that the document only exists if someone chose to create it, and its absence years later cannot be distinguished from a tank that was never sampled because nobody thought to.

Not, in the first instance, you. CGS 22a-450 directs its reporting duty at vessel masters, terminal operators, persons in charge of an establishment and vehicle operators, none of which describes a homeowner. The provision that reaches a house is CGS 22a-449n(b), which requires the registered contractor to notify DEEP immediately on discovering a spill, with loss of registration as the stated penalty.

Liability is a separate question with a broader answer. CGS 22a-451(a) makes the party responsible for a discharge liable for containment and removal costs, without a residential exception, and with multipliers where negligence or wilfulness is involved.

It helps to see where Connecticut sits, because the advice that circulates online is usually written for somewhere else. Maine registers every underground tank regardless of size or use and gives twelve months to act once one is out of service. Massachusetts attaches a mandatory site assessment to every removal. New Hampshire runs a grant that pays toward the work. Suffolk County in New York exempts residential tanks under 1,100 gallons by volume.

Connecticut does none of those. It draws its line by dwelling unit count rather than gallons, requires nothing of the tank owner on a timetable, offers no money, and puts its one hard requirement on the contractor. On the back end it is as exposed as Massachusetts, because liability for a discharge has no residential carve-out and there is no longer a fund standing behind it.