Fact Sheet November 2019: PFAS Study in North Pole Area Water
November 2019 - NOTE: the latest version of this fact sheet is dated Sep. 29, 2020.
- PFAS Sampling
- Drinking Water Well Results
- Untreated Water Results
- Surface Water Results
- Fish Sample Results
- Next Steps
See the PDF version of this fact sheet.
The finding of PFAS, or per- and polyfluoroalkyl substances, in drinking water has drawn attention nationwide, statewide and locally in the Fairbanks area. In Alaska, PFAS in the environment are often linked to the use of certain foams used in firefighting or fire training activities.
PFAS are man-made chemicals used in industry and consumer products worldwide since the 1950s. These chemicals resist heat, oil, water, and stains. They are used in firefighting foams and in many everyday products such as non-stick cookware and water- and stain-repellent fabrics. PFAS do not easily break down in the environment, and they can spread readily in groundwater. Concerns have emerged about possible health impacts of PFAS, and further studies are needed
- DEC's PFAS web page has more information on PFAS, DEC’s action levels and EPA’s PFAS Action Plan.
Drinking Water Well Results
POE water treatment systems (used for sulfolane removal) are removing PFAS to below DEC action levels. In fact, PFOS and PFOA were not detected in treated drinking water.
In summer 2018, DEC used the existing sulfolane monitoring program to sample North Pole groundwater for PFAS. DEC tested a small number of water supply wells and monitoring wells for PFAS.
DEC collected additional well samples and surface water samples from Kimberly Lake and Badger Slough in late fall/early winter 2018. Hydrologists chose the test locations to look for PFAS across a wide range of groundwater and surface water conditions over an approximate six square mile area in the direction of groundwater flow north and northwest of the former North Pole Refinery.
DEC is aware that fire-fighting foams containing PFAS were used in the past on the former refinery property. The goal of the 2018 monitoring was to look for PFAS off the refinery. PFAS is not related to sulfolane, except that both chemicals were used on the former refinery.
People in the area have already been provided alternate drinking water supplies or point of entry (POE) water treatment systems for sulfolane removal. The City’s piped public water system is expanding throughout the impacted area, and the area is expected to be impacted in the future. Some properties have already been hooked up to the expanded piped water system, with additional eligible properties able to connect by mid-2020
- 35 water supply wells, 20 of which had POE treatment systems, and
- 42 groundwater monitoring wells.
From each well with a POE treatment system, DEC took two samples: one untreated and the other after treatment. DEC took one sample from each of the other wells.
September 2020 Update:
- Map of PFOS + PFOA plume, from 2018 monitoring report (PDF).
- 2018 Offsite PFAS Monitoring Report, December 2019 (4.8M)
Drinking Water Well Results
PFOS and PFOA were not detected in any treated drinking water sample.
POE water treatment systems, used for sulfolane removal, are effectively removing PFAS to below DEC action levels.
Untreated Water Results
Groundwater migrating off the former North Pole Refinery has been impacted by PFAS.
Surface Water Results
Fish Sample Results
- The discovery of PFAS in Kimberly Lake led to the sampling of Kimberly Lake fish. In December 2018, Alaska Department of Fish and Game (ADF&G) sampled three rainbow trout from Kimberly Lake and analyzed them for PFAS.
- Both PFOS and PFNA were measured at levels of concern in all three fish from Kimberly Lake. In fish tissue, PFNA ranged from 16 to 22 parts per billion (ppb) and PFOS ranged from 47 to 68 ppb. These concentrations are orders of magnitude above the concentrations in surface water.
- In April 2019, ADF&G closed Kimberly Lake to sport fishing and will not continue to stock the lake.
- DEC is working with parties responsible for the contamination to further define the PFAS plume off the former North Pole Refinery property.
- Possible other sources of PFAS in the area are being explored.
Assessment and Cleanup
- Alaska Department of Environmental Conservation
- Division of Spill Prevention and Response
- Contaminated Sites Program
- Jim Fish
- Environmental Project Manager
- Alaska Department of Health and Social Services
- Division of Public Health
- Environmental Public Health Program
- Sarah Yoder
- Environmental Public Health Program Manager