# North Dakota — US boiler and pressure vessel inspection requirements by state

For North Dakota, governing body is North Dakota Department of Environmental Quality, Boiler Inspection Program; statute citation is North Dakota Statutes, Title 23.1. Environmental Quality, Chapter 23.1-16. Boiler Inspection, Sections 1 through 14; power boiler inspection interval is High-pressure boilers: Internal 1 Year, External 1 Year (while under pressure); low-pressure boiler inspection interval is Low-pressure steam boilers, steel: Internal 2 Years, External 2 Years. Low-pressure steam boilers, cast-iron: External 1 Year. Hot-water heating and hot-water supply boilers: External 3 Years (one annual external inspection for those located in hospitals, nursing homes, schools, nursery schools, and kindergartens); pressure vessel inspection interval is Field inspection of pressure vessels (other than anhydrous ammonia pressure vessels) is not required, recorded from its source on 2026-08-05.

- **State:** North Dakota
- **Governing body:** North Dakota Department of Environmental Quality, Boiler Inspection Program
- **Statute citation:** North Dakota Statutes, Title 23.1. Environmental Quality, Chapter 23.1-16. Boiler Inspection, Sections 1 through 14.
- **Power boiler inspection interval:** High-pressure boilers: Internal 1 Year, External 1 Year (while under pressure). _(verified: appears in the quote below)_
- **Low-pressure boiler inspection interval:** Low-pressure steam boilers, steel: Internal 2 Years, External 2 Years. Low-pressure steam boilers, cast-iron: External 1 Year. Hot-water heating and hot-water supply boilers: External 3 Years (one annual external inspection for those located in hospitals, nursing homes, schools, nursery schools, and kindergartens). _(verified: appears in the quote below)_
- **Pressure vessel inspection interval:** Field inspection of pressure vessels (other than anhydrous ammonia pressure vessels) is not required.
- **Accepted inspector types:** Inspections made by inspectors employed by National Board approved Authorized Inspection Agencies and commissioned by the department are accepted. Inspections made by inspectors employed by owners/users and commissioned by the department are accepted.
- **Exemptions:** Boilers and pressure vessels subject to federal inspection or under federal control. Boilers and pressure vessels located on farms and used solely for agricultural purposes. Heating boilers which are located in private residences or in apartment houses of fewer than six family units. Miniature hobby boilers not exceeding an inside diameter of 10 inches and a grate area not exceeding 1-1/2 square feet.

## What the source says

> Item | Internal | External | High-pressure boilers | 1 Year | 1 Year* | Low-pressure steam boilers, steel | 2 Years | 2 Years | Low-pressure steam boilers, cast-iron | — | 1 Year | Hot-water heating and hot-water supply boilers | — | 3 Years** | *External inspection while under pressure. **One annual external inspection for those located in hospitals, nursing homes, schools, nursery schools, and kindergartens.

## Source

- https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US boiler and pressure vessel inspection requirements by state](https://referencesource.org/boiler-inspection-requirements-by-state/).