# About lpst — scope, sources and limits

> How this site is built: which records are loaded, what is joined, what is deliberately not published.

## How this site is built

An independent search layer over two public files. Not affiliated with the Texas Commission on Environmental Quality or the State of Texas.

### Two files, joined — and the join is the whole point

The Commission publishes 29,830 leak cases in one file and
43,273 tanks in another. This site loads both and joins them on the TCEQ
facility number and the regulated entity number.

The overlap is **22.9%** of leak sites, and
that is not a failure of matching — it is the answer. The tank file
lists what is in service *now*; the leak file goes back to
1971, and 96.4% of its cases are closed. Most leaks
happened at sites whose tanks came out of the ground long ago. The
6,822 that overlap are the sites that leaked *and* still
operate, and 404 of those have an open case.

Those two numbers appear in neither source file. They are what this site
adds.

### ⚠️ What no page here says

**That a site is polluted.** The file records a reported date
and, if there is one, a closure date. It contains no measurement, no
substance, no extent. Turning that into a judgement about a named address
would be inventing a fact about someone’s property.

**The owner’s name.** It is in the tank file and is a
natural person’s name in a fair number of cases. Pages name the
*site* and the regulated entity; the owner appears only on an
individual result, drawn in your browser from the part of the URL after the
`#`, which cannot be indexed.

**A list of open cases.** 1,078 addresses under a heading
like that would be read as a verdict on each one. The count is published, the
map of it by county and decade is published, and the individual case is one
search away — with its dates, which is what makes it readable.

### ⚠️ One row is not one tank

The tank file has 69,143 rows for 43,273 physical tanks: a compartmented
tank appears once per product, and some rows repeat. We group on facility and
tank number and carry the products as a set. Counting rows would have
overstated the register by 60 %.

### How the pages are chosen

A county gets a page at 60 cases (82 of
254 qualify, covering 86.3%); a county-and-decade page
needs 100. Every case sits in exactly one county and one
decade, so the crossed pages divide their parent rather than overlapping it
— checked before the generator was written.

### Sources and freshness

LPST Sites (updated
**daily** by the Commission) and
 PST Delivery
Certificates , both the Texas Commission on Environmental Quality on data.texas.gov. Our copy is from
**2026-08-21**. For anything a transaction depends on, the
Commission’s own
records are the source.

TCEQ publications are not copyrighted, and you may download and reproduce them yourself as long as you don’t alter the content; the agency’s site content is « considered public domain », and it asks only for acknowledgment. Its logo is not public domain, and appears nowhere here.

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Página: https://lpst.pages.dev/about/
Fonte: Leaking Petroleum Storage Tank Sites and PST Delivery Certificates — Texas Commission on Environmental Quality
Recolha: 2026-08-21