# Datasets — Connecticut's six tank files, joined

> The 12,749 facilities and 49,918 tanks as one dataset, with the compliance, enforcement and release counts joined on. Fields, measured fill rates, published prices.

## Datasets

The pages of this site are free and will stay free — a public fact belongs to nobody. What is sold is the work of compiling it.

The pages of this site are free and will stay free : **an official fact belongs to no one**. What is sold here is the compilation work — extracting the Connecticut tank register, reconciling it, dating it, and delivering it in a usable form.

### Why the stream, not the snapshot

The Department refreshes all six files weekly. Tanks come out of use,
releases get reported, actions get resolved. A snapshot is a photograph of a
moving file; the difference between two weeks is what a portfolio holder
actually wants.

### What is in it

Every field below is measured on the delivered rows. A ⚠️ marks a column
none of the six source files contains — that is what you cannot get by
downloading them yourself.

*Fields delivered and fill rate, measured on the rows actually delivered — not estimated*

| Field | Description | Filled |
|---|---|---|
| `facility_id` | The Department's facility identifier, the key to all six files | 100.0 % |
| `name` | ⚠️ Site name, case-normalised from the source's capitals | 92.0 % |
| `address` | ⚠️ Street address, case-normalised | 100.0 % |
| `town` | ⚠️ Place name as the Department writes it | 100.0 % |
| `tanks` | ⚠️ ⚠️ Tanks on the facility, counted | 100.0 % |
| `tanks_in_use` | ⚠️ ⚠️ Of those, currently in use | 100.0 % |
| `construction` | ⚠️ ⚠️ Commonest tank construction at the facility, from tankconstructioncd | 96.0 % |
| `bare_steel` | ⚠️ ⚠️ 1 where any tank is bare or asphalt-coated steel — the federal upgrade target, and the one physical risk signal in these files | 100.0 % |
| `first_tank` | ⚠️ ⚠️ Earliest installation date at the facility, ISO | 96.4 % |
| `violations` | ⚠️ ⚠️ Compliance entries, joined from the compliance file | 100.0 % |
| `red_tags` | ⚠️ ⚠️ Red-tag entries, joined | 100.0 % |
| `enforcement` | ⚠️ ⚠️ Enforcement actions, joined on relatedfacilityid | 100.0 % |
| `releases` | ⚠️ ⚠️ Reported releases, joined on ustid — NOT on lustid, which matches 0 % | 100.0 % |
| `last_release` | ⚠️ ⚠️ Date of the most recent reported release | 20.1 % |

The 13 fields marked ⚠️ **do not exist in the source** : we add them — a join, a normalisation, or a reconstructed history. That is the part a buyer cannot reproduce by downloading the official file.

⚠️ The **names of contacts** are in the source and
are delivered in the dataset, but appear on no page of this site: they are
natural persons’ names. Coordinates are not carried — this answers
a question about records, not a map.

### What it costs

- **Change feed — USD 300 / month**Or USD 3 000 a year. At every collection, what came in, went out or changed since the previous one. This is the part that does not age.
- **One slice — USD 90 / month**The feed restricted to a single town, for those who do not need the rest.
- **Full snapshot — USD 4 000, once**The state of the register on the day of delivery, every field included. Listed last on purpose : a snapshot ages.

**Not a consumer reporting agency.** This site
and the datasets sold from it are **not** consumer reports under
the Fair Credit Reporting Act, and must not be used to decide anyone's
eligibility for employment, credit, insurance, housing, or any other purpose
covered by the FCRA. If you need a background check, use a screening company
that operates as a consumer reporting agency.

### Order

Tell us what you need : we reply with a sample, the field dictionary, and an invoice. **No payment is taken on this site** — an order opens a conversation.

Prices in USD, before any applicable tax. Delivered as CSV and Parquet, by download link. Every request is answered by hand.

Screening your own list instead of buying the set? That is [Pro access](/pro.md), priced on volume.

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