Decree 101/2020: What You Risk
Radon Exposure Limits and Sanctions
An in-depth guide to legal thresholds (300 Bq/m³) and criminal and administrative consequences for failure to comply with monitoring and remediation obligations described in Art. 205.
What are the concentration limits?
Decree 101/2020 does not speak of simple advice, but fixes binding 'Reference Levels' that oblige the owner or employer to act.
300 Bq/m³: The Critical Threshold
This value represents the maximum limit for the annual average radon concentration in air for all existing workplaces and existing dwellings.
It is not a sharp boundary between "safe" and "dangerous" (risk exists even at lower values), but it is the balance point chosen by the legislator where remediation intervention becomes mandatory and non-deferrable. Exceeding 300 Bq/m³ means exposing occupants to an unacceptable risk, equivalent to undergoing hundreds of chest X-rays every year.
→ WHO Recommendations (100 Bq/m³)
200 Bq/m³: The New Standard
For New Constructions (with permits issued after 31/12/2024), the law is stricter. The goal is to build "Radon Free" buildings from the start.
Companies and designers must adopt preventive techniques (ventilated crawl spaces, anti-radon bituminous sheaths, sealing of plant passages) to guarantee that the average concentration never exceeds 200 Bq/m³.
Read Full Decree 101/2020
The "Annual Average": Why a few days are not enough
Radon is a mutable gas: it changes from hour to hour due to temperature, atmospheric pressure, wind, and building usage (window opening).
A measurement of 4 or 5 days has no scientific or legal value to define the safety of an environment. Decree 101 explicitly discards instantaneous measures: an integrated annual measurement (or divided into two semesters) is necessary to calculate the real dose absorbed by occupants.
Criminal and Administrative Sanctions
Article 205 of Legislative Decree 101/2020 is extremely clear: non-compliance is not considered a simple bureaucratic error, but a violation of safety at work.
Omitted Measurement
The Employer has the obligation to measure using suitable dosimetry services (compliant with ISIN guidelines). If not done within the deadlines (e.g., 18 months from publication of priority areas), they are punished criminally with arrest from 1 to 6 months or a fine from €2,000 to €15,000. The sanction can be tripled in specific cases of recidivism or high risk.
→ Consult Art. 205 on Normattiva
Failure to Remediate
If the test report certifies a value exceeding 300 Bq/m³ and the responsible person does not start remediation procedures (appointing an expert and carrying out works), the penalty increases: arrest from 6 months to 1 year or fine from €5,000 to €20,000.
Request Remediation Quote
Communication Obligations
Not sending data to the national SUR database or not keeping documents for authority control (ASL/ARPA) entails administrative sanctions. Furthermore, in case of sale or rent, omitting information on radon leads to serious civil disputes and contract invalidation.
Suspension of Activity
In case of serious and repeated defaults that put the health of workers or occupants at risk (e.g., schools), supervisory authorities can order the suspension of activity until the premises are made safe.
Sanctions for Non-Compliance
Title XVI Decree 101/2020 - Sanctioning Apparatus
Sanctions Table
| Violation | Sanction |
|---|---|
| Omitted radon measurement (Art. 17, c.1) | Arrest 1-6 months or fine 2,000€ - 15,000€ |
| Failure to implement corrective measures (Art. 17, c.4) | Arrest 6 months - 1 year or fine 5,000€ - 20,000€ |
| Failure to communicate to workers (Art. 18) | Administrative pecuniary sanction |
| Omitted document preservation | Administrative pecuniary sanction |
Criminal Relevance of Violations
Title XVI of Decree 101/2020 provides for a rigorous sanctioning apparatus for subjects who do not fulfill the obligations provided by the legislation. It is important to emphasize that violations in matters of radiation protection have criminal relevance (contravention nature): convictions are entered in the criminal record and can lead to disqualification from public office.
The competent supervisory body (local ASL/ARPA) has direct inspection and sanctioning power, being able to proceed ex officio to contest violations. In case of serious and repeated defaults, suspension of activity can be ordered until premises are made safe.
Who answers to the Law?
Criminal liability is personal and falls on those who have decision-making and spending power over the property or activity.
The Employer
Is the pivotal figure of the prevention system. It does not matter if they are owner or tenant of the walls: it is he who must guarantee the safety of his employees and answers personally in case of default.
Specific obligations: Must include Radon in the Risk Assessment Document (DVR) within the terms provided by law, commission measurements to accredited laboratories, and in case of exceeding limits, appoint an Expert in Radon Remediation Interventions and carry out necessary works within 2 years.
The responsibility of "vigilance" is not delegable to third parties (not even to the RSPP): the employer always responds in first person, even if relying on external consultants. In case of checks by ASL or Labor Inspectorate, he is the first recipient of criminal sanctions provided by Art. 205.
The Operator (Public Places)
In places open to the public (medical offices, gyms, restaurants, private schools, kindergartens, beauty centers), the business owner (Operator) is equated to the employer even if he has no direct employees.
Why he is responsible: The law protects not only subordinate workers, but also casual collaborators, trainees, and indirectly the public frequenting the premises. If a customer or supplier spends significant time in the premises (e.g., hairdresser, dentist), the operator has the duty to ensure a healthy environment.
He has the same obligations as the employer: mandatory measurement in Priority Areas, remediation in case of exceeding, and preservation of documentation for at least 10 years. Ignoring the radon problem at your own risk and peril: criminal sanctions are identical to those provided for structured companies.
The Role of the Administrator
In condominiums, the Administrator has a double responsibility: acts as employer for direct employees (doormen, custodians, maintenance workers hired by the condominium) and as guarantor for common parts accessible to condominiums.
When the obligation triggers: If there are technical rooms frequented by workers (manned boiler room, meter room where a maintenance worker operates regularly, inhabited concierge), the administrator must have radon measured and, if necessary, remediate. He cannot unload responsibility on individual condominium owners.
Assembly resolution: For remediation works in common parts, approval of the condominium assembly is necessary with majorities provided by the Civil Code. However, the obligation of initial measurement falls directly on the administrator, who can be called to answer criminally in case of omission, even without prior resolution.
Frequently Asked Questions on Limits and Sanctions
If I exceed 300 Bq/m³, do I have to close the business?
Are checks real or just theoretical?
Can I measure with 'do-it-yourself'?
Does the limit apply also to upper floors?
Who pays for remediation in a rented premise?
What does the condominium administrator risk?
Is there tolerance if I exceed 300 Bq/m³ slightly (e.g., 310)?
If I sell a house, am I sanctionable if I haven't measured?
Are the sanctions 'one-off'?
What is the difference between arrest and fine?
Have other questions?
Consult our complete collection of frequently asked questions on measurement, remediation, and regulations.
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