# SEMCO ENERGY GAS COMPANY — Gas distribution annual report (2021)

**Citation:** PHMSA Annual Report 20221310 (2021)  
**Type / status:** inspection / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2021-12-31

Gas distribution; reporting year 2021; MI; Natural Gas. Operator-reported infrastructure data.

## Document text

Gas distribution annual report for reporting year 2021, submitted by SEMCO ENERGY GAS COMPANY (operator 18472). Reported scope: MI; Natural Gas. Represented states: MI. Selected reported fields: mmiles total: 6459.6; mmiles 2in to 4in total: 1403.6; mmiles 4in to 8in total: 1156.5; mmiles 8in to 12in total: 53.2; mmiles by dcd total: 6459.8; mmiles gt12in total: 5.4; mmiles lt2in total: 3840.9; mmiles part b2 total: 6459.6; mmiles pe total: 4617.9; mmiles steel total: 1841.7; num srvcs total: 300520; num srvs 1in to 2in total: 6607; num srvs 2in to 4in total: 263; num srvs 4in to 8in total: 41; num srvs by dcd total: 300520; num srvs cu total: 1; num srvs gt8in total: 1; num srvs lt1in total: 293608; num srvs part b3 total: 300520; num srvs pe total: 276461; num srvs steel total: 24058; total hazleaks cor mains: 10; total hazleaks cor srvs: 49; total hazleaks eq mains: 2; total hazleaks eq srvs: 16; total hazleaks ex mains: 33; total hazleaks ex srvs: 378; total hazleaks mat weld mains: 11; total hazleaks mat weld srvs: 31; total hazleaks nf mains: 7. The sortable date is the reporting-period end, not the operator submission date.

## Provenance

- Official: Yes
- Source: <https://data.transportation.gov/d/aemm-7pyq>
- Source ID: `phmsa-annual-reports`
- SHA-256: `4ab2113695c43881070c2e7bc3b84d1cbee28992964f28da44abdc25f83884ce`
- Retrieved: 2026-08-13T02:59:50.318Z
- Exported: 2026-08-26T23:32:16.959Z
- Document slug: `phmsa-annual-929dcd7bb02ff6746c7540ae`

### Source metadata

```json
{
  "materialSubtype": "phmsa_pipeline_annual_report",
  "dataset": "gas_distribution",
  "reportYear": 2021,
  "reportNumber": "20221310",
  "supplementalNumber": "46452",
  "sourceFormat": "modern_xlsx",
  "operator": {
    "id": "18472",
    "name": "SEMCO ENERGY GAS COMPANY"
  },
  "region": "MI",
  "commodity": "Natural Gas",
  "representedStates": [
    "MI"
  ],
  "jurisdictionClasses": [],
  "facilities": [],
  "metrics": {
    "MMILES_TOTAL": 6459.6,
    "MMILES_2IN_TO_4IN_TOTAL": 1403.6,
    "MMILES_4IN_TO_8IN_TOTAL": 1156.5,
    "MMILES_8IN_TO_12IN_TOTAL": 53.2,
    "MMILES_BY_DCD_TOTAL": 6459.8,
    "MMILES_GT12IN_TOTAL": 5.4,
    "MMILES_LT2IN_TOTAL": 3840.9,
    "MMILES_PART_B2_TOTAL": 6459.6,
    "MMILES_PE_TOTAL": 4617.9,
    "MMILES_STEEL_TOTAL": 1841.7,
    "NUM_SRVCS_TOTAL": 300520,
    "NUM_SRVS_1IN_TO_2IN_TOTAL": 6607,
    "NUM_SRVS_2IN_TO_4IN_TOTAL": 263,
    "NUM_SRVS_4IN_TO_8IN_TOTAL": 41,
    "NUM_SRVS_BY_DCD_TOTAL": 300520,
    "NUM_SRVS_CU_TOTAL": 1,
    "NUM_SRVS_GT8IN_TOTAL": 1,
    "NUM_SRVS_LT1IN_TOTAL": 293608,
    "NUM_SRVS_PART_B3_TOTAL": 300520,
    "NUM_SRVS_PE_TOTAL": 276461,
    "NUM_SRVS_STEEL_TOTAL": 24058,
    "TOTAL_HAZLEAKS_COR_MAINS": 10,
    "TOTAL_HAZLEAKS_COR_SRVS": 49,
    "TOTAL_HAZLEAKS_EQ_MAINS": 2,
    "TOTAL_HAZLEAKS_EQ_SRVS": 16,
    "TOTAL_HAZLEAKS_EX_MAINS": 33,
    "TOTAL_HAZLEAKS_EX_SRVS": 378,
    "TOTAL_HAZLEAKS_MAT_WELD_MAINS": 11,
    "TOTAL_HAZLEAKS_MAT_WELD_SRVS": 31,
    "TOTAL_HAZLEAKS_NF_MAINS": 7
  },
  "dependentRowsBySheet": {},
  "dataAsOf": "2026-02-02T07:27:15.000Z",
  "reportingPeriodEnd": "2021-12-31",
  "dateBasis": "calendar_year_end_not_submission_date",
  "provenance": {
    "archive": "annual_gas_distribution_2010_present.zip",
    "archiveSha256": "5a1422d800e6839d1dcacc2e9f1b24fc34371ef78f4cb8ffc53872eeeadfca1a",
    "workbook": "annual_gas_distribution_2021.xlsx",
    "sheet": "GD AR 2021",
    "rowNumber": 939,
    "sourceRowNumbers": [
      939
    ],
    "rowSha256": "8158ff7a5b1373ce45275016ca864a10c9b8f78eb401449ed32370077aeb9f45"
  },
  "caveat": "Operator-reported annual infrastructure data may be corrected. The indexed date is the reporting-period end, not the submission date, and the record is not an agency finding about current facility condition.",
  "jurisdiction": "US",
  "operatorName": "SEMCO ENERGY GAS COMPANY"
}
```