# SOUTHERN ILLINOIS POWER COOPERATIVE — Williamson County, IL

**Citation:** NPMS FIPS 17199 / OPID 38907  
**Type / status:** inspection / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2026-07-16

5.41932 active Natural Gas pipeline miles in Williamson County, IL; public NPMS snapshot 2026-07-16.

## Document text

SOUTHERN ILLINOIS POWER COOPERATIVE (PHMSA OPID 38907) reported 5.41932 active Natural Gas pipeline miles in Williamson County, IL (county FIPS 17199) in the public NPMS summary snapshot dated 2026-07-16. The snapshot includes active assets only and excludes permanently abandoned assets. Exact pipeline locations and restricted NPMS GIS data are not included.

## Provenance

- Official: Yes
- Source: <https://www.npms.phmsa.dot.gov/Documents/NPMS_Active_Pipe_County_Mileage.xlsx>
- Source ID: `npms-public-summaries`
- SHA-256: `5a250a3473449f868f3e6b531024e2c7800fa5f4af678e8b507a3d38bb47bb03`
- Retrieved: 2026-08-20T04:38:11.081Z
- Exported: 2026-08-25T11:26:37.854Z
- Document slug: `npms-mileage-7012f9236caf9b1f9400bea0`

### Source metadata

```json
{
  "materialSubtype": "pipeline_mileage",
  "dataAsOf": "2026-07-16",
  "dateBasis": "data_as_of_not_publication_date",
  "fips": "17199",
  "stateFips": "17",
  "state": "IL",
  "county": "Williamson County",
  "region": "Williamson County, IL",
  "operator": {
    "id": "38907",
    "name": "SOUTHERN ILLINOIS POWER COOPERATIVE"
  },
  "commodity": "Natural Gas",
  "mileage": 5.41932008,
  "plantCount": null,
  "snapshotScope": "active_assets_only",
  "personalContactDataExcluded": true,
  "restrictedGisExcluded": true,
  "provenance": {
    "workbook": "pipeline_mileage",
    "sheet": "Summary - Cnty, Oper, Commodity",
    "rowNumber": 2349,
    "rowSha256": "239b27d66c3d9c80ae4a78c36bebca8dc8b5a867fd6f3dae9b37c64cd0dcaffb"
  },
  "citedSections": [
    "191.29"
  ],
  "caveat": "Public aggregate snapshot only. It is not a complete representation of exact pipeline locations, may be updated, and is not an agency finding about facility condition.",
  "jurisdiction": "US",
  "operatorName": "SOUTHERN ILLINOIS POWER COOPERATIVE"
}
```