Marine Corps Air Station Beaufort

Environmental Restoration Program Public Website

The Navy and Marine Corps are requesting permission to sample drinking water obtained from drinking water wells
within a sampling area near Marine Corps Air Station (MCAS) Beaufort to test for certain per- and polyfluoroalkyl substances, commonly known as PFAS.

Property owners and tenants who drink water from a well on a property located within the sampling area may request sampling by calling
800-818-8455 to schedule a sampling appointment.

If your drinking water is provided by Beaufort-Jasper Water & Sewer Authority (BJWSA) and not from a well,
we do not need to sample your drinking water.

Introduction

Per- and polyfluoroalkyl substances (PFAS) are a family of thousands of different chemicals that have been widely used in industrial and consumer products since the 1950s. PFAS are manufactured chemicals and have been used in many household and industrial products because of their stain- and water-repellent properties. PFAS are now present virtually everywhere in the world. Once these compounds are released, they break down very slowly.

In May 2016, the United States Environmental Protection Agency (EPA) issued lifetime drinking water health advisories of 70 parts per trillion (ppt), individually or combined, for two PFAS, perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS). Health advisories are not enforceable, and are not regulatory levels; rather, they are levels that provide Americans, including sensitive populations, with a margin of protection from a lifetime of exposure.

In June 2016, the Department of the Navy developed a proactive policy to ensure the communities near our installations are not exposed to drinking water with PFOA and/or PFOS because of a known or potential Navy release of PFAS-containing materials. The Navy’s first priority is to ensure that concentrations of PFOA or PFOS in drinking water are not above 70 ppt as a result of a Navy PFAS release. The most common activity that could have resulted in the historical release of PFOA, PFOS, and other PFAS to the environment at Navy installations is the use of firefighting foam (specifically, aqueous film-forming foam, or AFFF) for testing, training, firefighting, and other life-saving emergency responses. Because of this historical use, there is potential for PFOA, PFOS, and other PFAS to be in the groundwater on base, and may be present in nearby drinking water wells.

On June 15, 2022, the EPA issued new interim drinking water health advisories for PFOA and PFOS. Because these interim health advisories are non-regulatory and are below detectable limits for certain PFAS, the Department of Defense (DOD) is instead looking to EPA to propose a regulatory drinking water standard, which is anticipated in 2023. DOD is currently evaluating its efforts to address PFAS in drinking water, and what actions we can take to be prepared to incorporate this standard.

In January 2023, DoD announced the release of a new military specification for firefighting foam. Until products that meet this new military specification are available, the Navy will continue to use formulations that contain lower concentrations of PFOA and PFOS than many historical AFFF formulations and will continue to take steps to prevent or minimize additional release of firefighting foam to the environment.

Off-Base Drinking Water Sampling at MCAS Beaufort (Figure 1)

PFOA and PFOS have been detected in groundwater at MCAS Beaufort above 70 ppt. When a known or suspected release of PFAS is identified on a Navy or Marine Corps installation and groundwater is used as drinking water, a sampling area is established 1 mile in the direction that groundwater likely flows away from a release area. The Navy and Marine Corps offer sampling to all property owners and tenants whose property is within the sampling area and whose drinking water is supplied by groundwater.

Figure 1: Location Map of MCAS Beaufort

At this time, the Navy and Marine Corps are only asking to sample drinking water wells located in the sampling area (Figure 2). Records indicate that most properties within the sampling area are provided drinking water by BJWSA. Property owners and tenants should contact BJWSA with any questions regarding treatment and testing of publicly-provided drinking water.

Figure 2: Sampling Area

Actions Based on Off-Base Drinking Water Sampling Results

The preliminary results from the off-base drinking water sampling near MCAS Beaufort are expected approximately 30 days after collecting the samples. We provide notification to the property owners and tenants of their drinking water results and any follow-up actions, if needed. The Navy and Marine Corps will do their best to keep the testing results and property information confidential to the extent permitted by law.

The Navy and Marine Corps will provide bottled water for drinking and cooking to any property in the sampling area with a drinking water well that contains PFOA and/or PFOS above 70 ppt and does not have an alternate drinking water source available. The Navy and Marine Corps will continue to provide bottled water until a permanent solution is implemented.

2022 Off-Base Drinking Water Sampling Results

In December 2022, the Navy and Marine Corps team initiated the sampling of drinking water from wells within a designated area near MCAS Beaufort. Table 1 summarizes the drinking water sampling results to date. We call each property owner and tenant upon receipt of their preliminary results to let them know if their water contains PFOS and/or PFOA above or below 70 ppt. Bottled water is typically provided within 24 hours of the preliminary results being received by the Navy and Marine Corps. Final laboratory results are mailed to each property owner and tenant after all data are verified and final. Out of respect for the privacy of the property owner and tenant, individual results are provided only to each property owner and tenant.

Table 1. MCAS Beaufort - Off-Base Drinking Water Results as of February 6, 2023

Number of Wells Sampled	Number of wells with no detections of PFOA or PFOS	Number of wells with detections of PFOA and/or PFOS below 70 ppt	Number of wells with detections of PFOA and/or PFOS above 70 ppt
17	11	6	0

Identification of PFAS at MCAS Beaufort

A Preliminary Assessment (PA) conducted in 2020 at MCAS Beaufort identified the following 28 on-base areas, shown on Figure 3, where releases of PFAS may have occurred. In December 2021, sample collection and analysis of groundwater and soil was completed at these areas as part of a Site Inspection (SI). At MCAS Beaufort, PFOA and PFOS were detected in shallow groundwater above 70 ppt. The Navy and Marine Corps will continue on-base PFAS investigations and evaluate if actions are needed on base.

PFAS Release Areas at MCAS Beaufort
1	Mobile Defoaming Unit
2	SWMU 13 - Western Fire Training Pits
3	SWMU 18 - Current Fire Training Pits
4	SWMU 63 - OWS at Current Fire Training Pits
5	Hangar 1331
6	1991 Crash Site
7	Compass Rose Crash Site
8	West Ramp Area
9	Hangar 414
10	Hangar 1084
11	Hangar 418
12	Former Hangar 728
13	East Ramp Area
14	Building 1313 – Aircraft Rescue and Firefighting Station
15	Building 595 – Former Aircraft Rescue and Fire Fighting/Fire Department Station
16	Hangar 729
17	Former Hangar 416
18	Hangar 2146
19	Building 1256
20	Hangar 594
21	SWMU 74 - Hazardous Waste Storage Tank 979
22	Building 843
23	SWMU 67 – Sewage Treatment Plant
24	SWMU 6 Former Seepage Trenches and SWMU 14 Inert Landfill
25	Building 1171
26	Building 2085 - Fire Department Station
27	2019 Fire Response Area
28	SWMU 12 - Former Eastern Fire Training Pits