Radionuclides Rule (Rads)

Fact Sheet

• Quick Reference Guide
• Radionuclides in Drinking Water: A Small Entity Compliance Guide

FAQ

• 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.

Links

• Radionuclide Rule Compliance Help for Public Water Systems