# What Connecticut's registered tanks hold

> The 12,749 registered tank facilities in Connecticut by the substance recorded — petrol, diesel, heating oil and the rest.

## What the tanks hold

Not every tank on this register belongs to a filling station. A good share heat a building.

| Substance recorded | Facilities | Share |
|---|---|---|
| [Gasoline](/substance/gasoline.md) | 5,100 | 40.0% |
| [Diesel](/substance/diesel.md) | 3,622 | 28.4% |
| [Heating Oil(on-site Consumption)](/substance/heating-oil-on-site-consumption.md) | 3,383 | 26.5% |
| [Not stated](/substance/not-stated.md) | 321 | 2.5% |
| [Used Oil](/substance/used-oil.md) | 194 | 1.5% |
| [Hazardous Substance](/substance/hazardous-substance.md) | 83 | 0.7% |

### What each one is

#### [Gasoline](/substance/gasoline.md)

the commonest substance in the register and the reason most of these facilities exist — filling stations. Petrol tanks are the ones the federal upgrade rules were written for.

#### [Diesel](/substance/diesel.md)

found at filling stations, but also at depots, garages and any site that fuels its own vehicles.

#### [Heating Oil(on-site Consumption)](/substance/heating-oil-on-site-consumption.md)

heating oil kept for the building it stands under — schools, churches, apartment blocks, offices. These are not commercial fuel sites, and they are the part of the register the public least expects to find.

#### [Not stated](/substance/not-stated.md)

the file records no substance for these tanks.

#### [Used Oil](/substance/used-oil.md)

waste oil held for collection, typically at garages.

#### [Hazardous Substance](/substance/hazardous-substance.md)

a category the state uses for tanks holding regulated substances other than fuel. The file does not say which substance.

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Página: https://ust-ct.pages.dev/substance/
Fonte: Underground storage tank records — Connecticut Department of Energy and Environmental Protection (six datasets)
Recolha: 2026-08-21