The Ontario Building Code | Radon
3.1.1.2. Radon
(1) In addition to all other requirements, a buildingin the following designated areas shall be designed and constructed so that the annual average concentration of radon 222 does not exceed 200 Bq/m3of air and the annual average concentration of the short lived daughters of radon 222 does not exceed 0.02 working levels inside the building:
(a) the City of Elliot Lake in the Territorial District of Algoma,
(b) the Township of Faraday in the County of Hastings, and
(c) the geographic Township of Hyman in the Territorial District of Sudbury.
In Plain Language
This clause requires enhanced radon protection specifically for buildings in three named Ontario locations, the City of Elliot Lake, the Township of Faraday, and the geographic Township of Hyman, capping average indoor radon concentration and its decay products at set thresholds, reflecting known elevated radon risk in those areas.
Common Questions
Q: Does this radon rule apply everywhere in Ontario?
No. It specifically targets three designated areas with known elevated radon risk: Elliot Lake, the Township of Faraday, and the geographic Township of Hyman. General radon protection elsewhere is addressed by other Code provisions.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.