# Addition of a Subsurface Intrusion Component to the Hazard Ranking System
> **Rule** · — · Published 2018-01-31 · 83 FR 4430
## Document
- **Document number:** 2018-01972
- **Category:** other
- **Federal Register citation:** 83 FR 4430
- **CFR reference:** 40 CFR 300
- **Publication date:** 2018-01-31
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/01/31/2018-01972/addition-of-a-subsurface-intrusion-component-to-the-hazard-ranking-system)
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