# Service lines: Cast iron and ductile iron.

**Citation:** 49 CFR 192.373  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) Cast or ductile iron pipe less than 6 inches (152 millimeters) in diameter may not be installed for service lines.

(b) If cast iron pipe or ductile iron pipe is installed for use as a service line, the part of the service line which extends through the building wall must be of steel pipe.

(c) 

## Document text

(a) Cast or ductile iron pipe less than 6 inches (152 millimeters) in diameter may not be installed for service lines.

(b) If cast iron pipe or ductile iron pipe is installed for use as a service line, the part of the service line which extends through the building wall must be of steel pipe.

(c) A cast iron or ductile iron service line may not be installed in unstable soil or under a building.

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-85, 63 FR 37503, July 13, 1998]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-192.373>
- Source ID: `ecfr`
- SHA-256: `6b1a217f03a22d7886e75be55ea36805a009ec36157d8808a085f39ff211f77f`
- Retrieved: 2026-08-20T05:54:34.435Z
- Exported: 2026-08-23T16:49:09.089Z
- Document slug: `49-cfr-192-373`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "192",
  "section": "192.373",
  "subpart": "Subpart H—Customer Meters, Service Regulators, and Service Lines",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```