Good Afternoon DWTU JC Members,
Here are a couple of additional resources that may be of interest to you. First, Regu has provided the following link to a recent study on the effectiveness of POUs on PFAS contaminants:
https://pubs.acs.org/doi/pdf/10.1021/acs.estlett.0c00004 Second, Bob Powitz has forwarded the following information from our previous JC member Dr. Bill Anderson (University of Waterloo):
Hi allâmany of you will be familiar with the USEPA Unregulated Contaminant Monitoring Rules (UCMR). These are prepared in association
with the
Contaminant Candidate List (CCL) which is updated every
five years . The UCMR 4 monitoring period has ended and data were published in April 2021. A 13 page summary is available at:
https://www.epa.gov/sites/production/files/2018-10/documents/ucmr4-data-summary.pdf . The samples were collected from
treated drinking water and included ten
cyanotoxins and manganese,
among others. Out of more than 34,000 samples, total microcystin was detected above the minimum reporting level (MRL) only 8 times; however,
anatoxin-a was reported in excess of its MRL 132 times,
and cylindrospermopsin 13 times. The results for microcystin and anatoxin-a probably arenât as suspicious as appears at first glance. It is important to note that microcystin
is effectively inactivated by chlorine whereas anatoxin-a is not. It is a bit more difficult to tease out information from the manganese data as the âreference concentrationâ was 300 Âg/L whereas the Health Canada MAC for total manganese is 120 Îg/L and the
aesthetic objective (AO) is 20 Îg/L.
Under UCMR 4, Public Water Systems conducted sampling for assessment monitoring
(âList 1â) contaminants as shown below:
Â
10 cyanotoxins
including:
total microcystins, microcystin-LA, microcystin-RR, microcystin-LF, microcystin-YR, microcystin-LR, microcystin-LY, nodularin, cylindrospermopsin, and anatoxin-a
Â
20 additional contaminants including: germanium, manganese, alphahexachlorocyclohexane, profenofos, chlorpyrifos, tebuconazole, dimethipin, total permethrin (cis- & trans-)
ethoprop tribufos, oxyfluorfen, HAA5, HAA6Br, HAA9, 1-butanol, 2-propen-1-ol, 2-methoxyethanol, butylated hydroxyanisole, o-toluidine, and quinoline
Bill
__________________________________________________
Background
âEPA uses the Unregulated Contaminant Monitoring Rule (UCMR) program to collect nationally representative data for
contaminants suspected to be present in drinking water,
but that do not have regulatory standards . UCMR 4 requires monitoring for 30 chemicals between 2018 and 2020. This monitoring is used by EPA to understand the frequency
and level of occurrence of unregulated contaminants in the nationâs public water systems (PWSs). Every five years EPA develops a new list of UCMR contaminants, largely based on the Contaminant Candidate List (CCL). The Safe Drinking Water Act (SDWA) calls
for EPA to:
Require monitoring for no more than 30 contaminants per 5-year cycle
Collect data from large PWSs (i.e., those that serve more than 10,000 people)
Collect data from a representative sample of small PWSs (i.e., those serving less than or equal to 10,000 people)
Store analytical results in the National Contaminant Occurrence Database (NCOD).â
Monica H. Leslie, MPH
Operations Manager, Standards Tel : +1-734-827-5643 Email:
mleslie@xxxxxxx NSF International
789 N. Dixboro Road Ann Arbor, MI 48105 USA
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