PFAS

Newport News Waterworks

PFAS FACT SHEET                                                          LAST DATE: 10.18.23

BACKGROUND

Recent national news about a group of synthetic chemicals known as PFAS may have customers concerned about the safety of their drinking water.

PFAS stands for perfluoroalkyl and polyfluoroalkyl substances. Two of these chemicals, PFOA and PFOS, have been used to make carpets, clothing, food packaging, non-stick cookware, and other materials; they are also found in firefighting foams. 

For most people, consumer products and food are the main sources of exposure to these chemicals; however, drinking water can be an additional source in communities where these chemicals have contaminated the water supplies. Such contamination is typically localized and associated with a specific facility, for example, an industrial plant where these chemicals were produced or an airfield at which they were used for firefighting and have entered the water supply. 

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FOR YOUR INFORMATION 

Health Advisories are not enforceable like regulations. Instead, the advisories are interim guidance issued by the USEPA before they develop a formal regulation. At this time, there is no regulatory limit on the concentration of PFAS chemicals in drinking water. USEPA has updated a previously established “health advisory” and is in the process of developing regulations. The health advisory level is now set to 0.004 ppt (parts per trillion or nanograms/liter) for PFOA, 0.02 ppt for PFOS. For perspective, 1 ppt or nanograms/liter is equal to 1 teaspoon (5 mL) in 2,000 Olympic-sized swimming pools (2.5 million liters each). USEPA has also added PFBS (2,000 ppt) and GenX (10 ppt) to the new health advisory.  (See chart below for comparisons.)    

In March 2023, the EPA proposed the National Primary Drinking Water Regulation (NPDWR) for six PFAS chemicals, including PFOA, PFOS, PFNA, GenX, PFHxS, and PFBS. The new regulation sets Maximum Contaminant Level Goals (MCLG), as well as enforceable Maximum Contaminant Levels (MCLs). For PFOA and PFOS, the proposed MCLG is zero, while the MCLs are proposed to be 4.0 ppt.

The PFAS chemicals PFNA, GenX, PFHxS, and PFBS are frequently found together and have similar potential health risks. The MCL for this group of chemicals is based on a Hazard Index (HI). The HI is calculated based on the toxicity reference values established by the EPA. The proposed MCLG and MCL for the combined group of chemicals is an HI value of 1.0 (unitless). The toxicity reference values used in the proposed regulation are 9.0 ppt for PFHxS, 10.0 ppt for GenX and PFNA, and 2,000 ppt for PFBS. The proposed regulation is a draft and does not require immediate actions

Waterworks has been monitoring for these emerging contaminants for over three years, and the results for the majority of source waters were below the detection limit using currently available testing methods. In some cases, the advisory is set lower than current analytical methods can detect. Waterworks will continue to monitor the sources where the presence of these contaminants were confirmed and will adopt management and treatment strategies that ensure full compliance with future PFAS regulatory requirements. We are also working with a State Incident Response team to address the likely source(s) of these compounds. In addition to PFOA and PFOS, we have also monitored for PFBS and Gen-X in the finished water and source waters; these latter two contaminants have been well below the recent USEPA health advisories.

As noted in USEPA's  June 13, 2022 announcement, guidance on these emerging contaminants continues to evolve. The interim Health Advisory Levels (HALs) for these contaminants are substantially lower than reliable detection abilities of scientific instruments and methods. Because of this, the Environmental Council of the States (ECOS) (a national nonprofit, nonpartisan association of state and territorial environmental agency leaders) and American Water Works Association (AWWA) have expressed significant concern over the new interim health advisories through letters and public statements. Below is a summary of NNWW PFAS monitoring results compared to the previous and new HAL.

Contaminant, units

MCLG

MCL

MAX CONC

RANGE


PFOA, ppt

0

4.0

3.7

<2.0 - 4.2

Max Conc.- running annual average includes 2022 data  Range – individual samples collected in 2023

PFOS, ppt

0

4.0

4.5

3.2 - 6.4

Max Conc.- running annual average includes 2022 data  Range – individual samples collected in 2023


Hazardous Index

0

1.0

0.62

0.0 - 0.87

Max Conc.- running annual average includes 2022 data  Range – individual samples collected in 2023


WHAT IS NEWPORT NEWS WATERWORKS DOING ABOUT PFAS?

We recognize the average level of PFOA and PFOS in our treated water is above the USEPA’s new health advisory levels.  That is why continued research is our priority.  Our staff is committed to learning more about:

  • Determining the levels of PFAS in our water with additional monitoring and identifying any patterns
  • Understanding established and emerging treatment options
  • Developing practical and feasible strategies to reduce levels of PFAS as USEPA develops and finalizes its future drinking water standards.
  • Continuing to participate in statewide screenings and assessment programs being conducted by Virginia Department of Health (VDH), Virginia Department of Environmental Quality (DEQ) and the U.S. Geological Survey
  • Evaluating treatment options to meet possible new regulations
  • Using PFAS levels as a criteria in choosing how much to use each source water

 Customers can be assured their water meets all current federal and state standards. We are committed to protecting public health and will continue to monitor this issue closely to stay ahead of potential risks. 

 PLEASE NOTE

Waterworks is committed to providing safe drinking water to the communities we serve.

  • The results of our continual testing show that our water meets or surpasses state and federal standards for safe drinking water.
      
  • We regularly share the results of our water quality testing with the public. You can view our annual water quality report at nnva.gov/waterqualityreport 
  • Waterworks participated in a study by VDH in the summer of 2023 with the results planned to be published in November 2023. Please note that the PFAS level results for NNWW are higher than annual averages, which is typical of the summer months. NNWW results can be found in our water quality report at nnva.gov/waterqualityreport
  • Compliance for MCLs is based upon an annual average of the quarterly sampling, not individual results.

Newport News Waterworks Customer Service
 
757-926-1000 | Monday - Friday, 8 am to 5 pm
wwcs@nnva.gov