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Radionuclides Rule (Rads)
Quick Reference Guide
Radionuclides in Drinking Water: A Small Entity Compliance Guide
Who must comply with the radionuclides monitoring requirements?
The radionuclide rule is only applicable to community water systems with sampling to be conducted at all entry points to the distribution system.
What are the maximum contaminant levels (MCLs) as set under the radionuclide rule?
Uranium = 30 ug/L
Combined Radium 226 & 228 = 5 pCi/L
Gross alpha = 15 pCi/L
Beta/photon emitters = 4 mrem/yr
What is the monitoring frequency for radionuclides?
Based on initial monitoring data, monitoring frequency is 1 sample every 9 years; 1 sample every 6 years; 1 sample every 3 years; or 1 sample per quarter until results from 4 consecutive quarters ≤ MCL.
Radionuclide Rule Compliance Help for Public Water Systems
Department of Environmental Quality
918 E. Divide Ave
Bismarck, ND 58501
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