MassDEP Drinking Water Guideline for the UCMR3 Longer Chain PFAS
C, IVlark Smith Ph.D., M.S. Director, Office of Research and Standards
6/ 20/2018
Sierra Club v. EPA 18cv3472 NDCA
Tier 10
ED 002061 00268128-00001
Background
Unregulated Contaminant Monitoring Rule (UCMR) 3 included 6 PFAS
- PFOS; PFOA; PFNA; PFHpA; PFHxS; PFBS
Nationally, about 1% > EPA HA (PFOS/PFOA) MA about the same
- 171 PWS tested: 5 detects/2 above HA - Additional sites identified
PFAS beyond PFOS and PFOA detected
- No EPA Health Advisories for the others
ORS asked to develop recommendations
Sierra Club v. EPA 18cv3472 NDCA
Tier 10
ED 002061 00268128-00002
UCMR3PFAS
Perfluorooctanoic add 335 - 6 7 - 1 Carbons = 8 Fluorinated Carbons = 7
Perfluorooctanesulfonic add 1763 - 2 3 - 1 Carbons= 8 Fluorinated Carbons = 8
Perfluorononanoic add 375 - 9 5 - 1 Carbons= 9 Fluorinated Carbons = 8
Perfluoroheptanoic add 375 - 8 5 - 9
Carbons= 7 Fluorinated Carbons = 6
Perfluorohexanesulfonlc add 355 - 4 6 - 4 Carbons = 6 Fluorinated Carbons = 6
Perfluorobutanesulfonic add 375 - 7 3 - 5 Carbons= 4 Fluorinated carbons = 4
UCM R3 PFAS
Chemical Structure PFOA
..
. .
.. .. K . .. _
... ... " i - v ""
PFOS
....
..
In vivo toxicity*
1
Half - life In body
3.5 years
1
4.8 years
PFNA
'
'"tf
PFHpA
.. T1 ..
> /= l
3.2 years
..........I f ....... _ _
NA
NA
PFHxS '
...
'
0 _
* -
..
*
9
PFBS
"
` ' Bl"
vrr>
"
v v
" *"*
> /= l
< 0 .0 1
7.3 years 0.1 year
1
Z
"
^ : r } \ i " :...: f
o
;,
. .
/'
"
F f V ;.../
;
Sierra Club v. EPA 18cv3472 NDCA
Tier 10
ED 002061 00268128-00003
ORS Recommendations
Treat the five longer carbon chain UCMR 3 PFAS the same
-- Same approach as adopted by Connecticut Department of Public Health (CT DPH)
Further assessment needed for PFBS Reviewed and endorsed by MassDEP Health
Effects Advisory Panel
-- Technical experts in toxicology; risk assessment and public health/MADPH
Sierra Club v. EPA 18cv3472 NDCA
Status
MA Drinking Water Guideline formally adopted:
-- 70 ppt for sum of the 5: PFOs; PFOA; PFNA; PFHxS; PFHpA -- MA MCL under consideration
Guideline being implemented by MA Drinking Water Program
-- Public notification -- Expeditious steps to reduce levels
PFAS also being addressed under MA Hazardous Waste Site program
Waste Site Cleanup Standards being developed
Sierra Club v. EPA 18cv3472 NDCA