RADON FACTS
1 working level
=
3 DAC Rn
(including progeny)
222
=
1.3E5 MeV / liter of air
á
energy
=
100 pCi / liter (1E-7 uCi / mL)
=
20.8 uJoules / M
3
1 working level-month = 1 pCi / L in air thru evaporation
EPA ACTION LEVELS FOR RADON GAS IN HOMES
Concentration (pCi / L)
Sampling Frequency
0 - 4
initial and no follow up
EPA Recommends Mitigation at > 4 pCi / L
4 -20
one year and follow up
20 -200
3 months and follow up
> 200 Implement radon reduction methods
4 pCi / L in living area = 1.03 working level-month = 1 rem
PROPOSED EPA ACTION LEVELS
FOR RADON IN DRINKING WATER
Maximum Contaminant Level (MCL) is 300 pCi / L of radon in
water of community water systems (CWS).
Alternative Maximum Contaminant Level (AMCL) is 4,000 pCi
/ L of radon in water of community water systems.
To comply with the AMCL limit the state or the CWS
(Community Water System) must implement a Multi-Media
Mitigation plan to address the radon in the air of residences.
The proposed rule would not apply to CWSs that use solely
surface water.
The proposed rule requires monitoring for radon in drinking
water. The monitoring frequency varies from once per quarter
to once in 9 years based on radon concentrations.
RADON FACTS
1 working level
=
3 DAC Rn
(including progeny)
222
=
1.3E5 MeV / liter of air
á
energy
=
100 pCi / liter (1E-7 uCi / mL)
=
20.8 uJoules / M
3
1 working level-month = 1 pCi / L in air thru evaporation
EPA ACTION LEVELS FOR RADON GAS IN HOMES
Concentration (pCi / L)
Sampling Frequency
0 - 4
initial and no follow up
EPA Recommends Mitigation at > 4 pCi / L
4 -20
one year and follow up
20 -200
3 months and follow up
> 200 Implement radon reduction methods
4 pCi / L in living area = 1.03 working level-month = 1 rem
PROPOSED EPA ACTION LEVELS
FOR RADON IN DRINKING WATER
Maximum Contaminant Level (MCL) is 300 pCi / L of radon in
water of community water systems (CWS).
Alternative Maximum Contaminant Level (AMCL) is 4,000 pCi
/ L of radon in water of community water systems.
To comply with the AMCL limit the state or the CWS
(Community Water System) must implement a Multi-Media
Mitigation plan to address the radon in the air of residences.
The proposed rule would not apply to CWSs that use solely
surface water.
The proposed rule requires monitoring for radon in drinking
water. The monitoring frequency varies from once per quarter
to once in 9 years based on radon concentrations.
RADON FACTS
1 working level
=
3 DAC Rn
(including progeny)
222
=
1.3E5 MeV / liter of air
á
energy
=
100 pCi / liter (1E-7 uCi / mL)
=
20.8 uJoules / M
3
1 working level-month = 1 pCi / L in air thru evaporation
EPA ACTION LEVELS FOR RADON GAS IN HOMES
Concentration (pCi / L)
Sampling Frequency
0 - 4
initial and no follow up
EPA Recommends Mitigation at > 4 pCi / L
4 -20
one year and follow up
20 -200
3 months and follow up
> 200 Implement radon reduction methods
4 pCi / L in living area = 1.03 working level-month = 1 rem
PROPOSED EPA ACTION LEVELS
FOR RADON IN DRINKING WATER
Maximum Contaminant Level (MCL) is 300 pCi / L of radon in
water of community water systems (CWS).
Alternative Maximum Contaminant Level (AMCL) is 4,000 pCi
/ L of radon in water of community water systems.
To comply with the AMCL limit the state or the CWS
(Community Water System) must implement a Multi-Media
Mitigation plan to address the radon in the air of residences.
The proposed rule would not apply to CWSs that use solely
surface water.
The proposed rule requires monitoring for radon in drinking
water. The monitoring frequency varies from once per quarter
to once in 9 years based on radon concentrations.
RADON FACTS
1 working level
=
3 DAC Rn
(including progeny)
222
=
1.3E5 MeV / liter of air
á
energy
=
100 pCi / liter (1E-7 uCi / mL)
=
20.8 uJoules / M
3
1 working level-month = 1 pCi / L in air thru evaporation
EPA ACTION LEVELS FOR RADON GAS IN HOMES
Concentration (pCi / L)
Sampling Frequency
0 - 4
initial and no follow up
EPA Recommends Mitigation at > 4 pCi / L
4 -20
one year and follow up
20 -200
3 months and follow up
> 200 Implement radon reduction methods
4 pCi / L in living area = 1.03 working level-month = 1 rem
PROPOSED EPA ACTION LEVELS
FOR RADON IN DRINKING WATER
Maximum Contaminant Level (MCL) is 300 pCi / L of radon in
water of community water systems (CWS).
Alternative Maximum Contaminant Level (AMCL) is 4,000 pCi
/ L of radon in water of community water systems.
To comply with the AMCL limit the state or the CWS
(Community Water System) must implement a Multi-Media
Mitigation plan to address the radon in the air of residences.
The proposed rule would not apply to CWSs that use solely
surface water.
The proposed rule requires monitoring for radon in drinking
water. The monitoring frequency varies from once per quarter
to once in 9 years based on radon concentrations.
