# SEMCO ENERGY GAS COMPANY — St. Clair County, MI

**Citation:** NPMS FIPS 26147 / OPID 18472  
**Type / status:** inspection / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2026-07-16

50.924496 active Natural Gas pipeline miles in St. Clair County, MI; public NPMS snapshot 2026-07-16.

## Document text

SEMCO ENERGY GAS COMPANY (PHMSA OPID 18472) reported 50.924496 active Natural Gas pipeline miles in St. Clair County, MI (county FIPS 26147) 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: `86202e617735c36ef5b488c18ff12d7f4526ecb4f513e67a0666ead3b8f8c56a`
- Retrieved: 2026-08-20T04:38:11.081Z
- Exported: 2026-08-25T13:13:41.149Z
- Document slug: `npms-mileage-7145e9fca7d63590943bb14b`

### Source metadata

```json
{
  "materialSubtype": "pipeline_mileage",
  "dataAsOf": "2026-07-16",
  "dateBasis": "data_as_of_not_publication_date",
  "fips": "26147",
  "stateFips": "26",
  "state": "MI",
  "county": "St. Clair County",
  "region": "St. Clair County, MI",
  "operator": {
    "id": "18472",
    "name": "SEMCO ENERGY GAS COMPANY"
  },
  "commodity": "Natural Gas",
  "mileage": 50.92449622,
  "plantCount": null,
  "snapshotScope": "active_assets_only",
  "personalContactDataExcluded": true,
  "restrictedGisExcluded": true,
  "provenance": {
    "workbook": "pipeline_mileage",
    "sheet": "Summary - Cnty, Oper, Commodity",
    "rowNumber": 5882,
    "rowSha256": "608061e85b2b4dcc6078ebfe7327423d3e4e88e4963587fd830809fa2b9d4fab"
  },
  "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": "SEMCO ENERGY GAS COMPANY"
}
```