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NHDES proposes new PFAS drinking water standards

CONCORD — The New Hampshire Department of Environmental Services (NHDES) has filed a final rulemaking proposal to establish maximum contaminant levels (MCLs)/drinking water standards and ambient groundwater quality standards (AGQS) for four per- and polyfluoroalkyl substances (PFAS): perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), perfluorononanoic acid (PFNA) and perfluorohexanesulfonic acid (PFHxS) to ensure greater protection of public health related to the consumption of drinking water. The rulemaking proposal was filed friday with the New Hampshire Joint Legislative Committee on Administrative Rules (JLCAR) for consideration at its July 18 meeting. If approved by JLCAR, the new rules are scheduled to become effective on Oct. 1.

Using the most recent and best science available, NHDES is proposing the following drinking water standards that are protective for the most sensitive populations over a lifetime of exposure:

Final Proposed MCL and AGQS

PFOA 12 ppt

PFOS 15 ppt

PFHxS 18 ppt

PFNA 11 ppt

These MCLs are drinking water quality standards that non-transient public water systems (water systems serving the same 25 people at least 60 days a year) must comply with. An AGQS is the standard used to require remedial action and the provision of alternative drinking water at a contaminated site. It also dictates the conditions under which treated and untreated wastewater may be discharged to groundwater. Current law requires AGQSs be the same value as any MCL established by NHDES and also that they be at least as stringent as health advisories set by the U.S. Environmental Protection Agency (EPA). In 2016, NHDES adopted EPA’s health advisory for PFOA and PFOS as an AGQS at 70 parts per trillion (ppt) individually or combined.

To establish MCLs for PFOA, PFOS, PFHxS and PFNA, NHDES had to consider the extent to which the contaminants are found in New Hampshire, the ability to detect them in public water systems, the ability to remove the contaminant from drinking water, and the costs and benefits to affected parties that will result from establishing the standard, and then develop a MCL for each compound that is protective of the most sensitive population at all life stages.

Included with the final proposal, NHDES is providing a summary technical report on the development of the drinking water standards (MCLs) including an explanation of the health risk assessment for each compound and information on cost, benefit, occurrence, and ability to detect and treat these chemicals. That summary technical report can be found here: www.des.nh.gov/organization/commissioner/legal/ rulemaking/index.htm#pdrinking

Additionally, NHDES has posted its response to public comments received during the public comment period on the initial proposal: www4.des.state.nh.us/nh-pfas-investigation/

NHDES and NHDHHS have compiled a list of frequently asked questions and answers associated with PFAS, drinking water, and potential health impacts that can be found here: www4.des.state.nh.us/nh-pfas-investigation/wp-content/uploads/PFAS-FAQs_MCL-Draft-6.26.19v.3.doc

Since new drinking water standards may encourage private well owners to test their wells for the newly regulated compounds, NHDES has compiled an updated well testing fact sheet that can be found here: www4.des.state.nh.us/nh-pfas-investigation/wp-content/uploads/2019/06/pfoa-testing-labs.pdf

Should you wish to consider or install PFAS treatment in your home or business, NHDES has compiled a fact sheet on treatment technologies for PFAS that can be found here: www4.des.state.nh.us/nh-pfas-investigation/?page_id=171

A discussion of the summary technical report with interested stakeholders will be conducted in the NHDES Auditorium (29 Hazen Dr. in Concord) on July 9 at 9 a.m. If you wish to attend please provide a courtesy RSVP via email [email protected] Attendees are reminded to bring a government furnished picture ID for entrance.

For additional information, please contact Jim Martin, NHDES Public Information Officer at (603) 271-3710.

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