NAVAL AIR STATION PENSACOLA

In 2019, the sampling area for NAS Pensacola (Figure 2) was established 1 mile from PFAS release areas in the direction that groundwater flows away from the on base PFAS release areas. In 2025, the sampling area was expanded to account for uncertainties in groundwater flow direction. (Figure 2).

The Navy sampled 9 private drinking water wells in the sampling area near NAS Pensacola in 2019. Laboratory results demonstrated that none of these wells contained PFAS above 70 ppt PFOA and/or PFOS (the Navy’s action level at the time of sampling). Laboratory results also demonstrated that none of these wells contained PFAS at or above the DoW PFAS interim action levels for private drinking water wells. (Table 1)

In 2025, the Navy sampled 5 private drinking water wells in the sampling area near NAS Pensacola (2 wells were newly identified wells and 3 wells were previously sampled in 2019). Laboratory results demonstrated that none of the private drinking water wells sampled near NAS Pensacola in 2025 contained PFAS above 70 ppt PFOA and/or PFOS. Laboratory results also demonstrated that none of these wells contained PFAS and/or PFOS or at or above the DoW PFAS interim action levels for private drinking water wells. (Table 1)

Table 2 provides a summary of the results of the sampling. Table 3 presents the PFAS results for each of the sampled wells. Figure 3 shows the generalized sample results.
 
Table 2: NAS Pensacola 2019 and 2025 Private Drinking Water Well Results Summary

Number of Wells Sampled	Number of wells with no detections of PFOA, PFOS, PFNA, PFHxS, HFPO-DA, or PFBS	Number of wells with detections of PFAS below the DoW PFAS interim action levels*	Number of wells with detections of PFAS at or above DoW PFAS interim action levels* and below 70 ppt PFOA and/or PFOS	Number of wells with detections of PFOA and/or PFOS above 70 ppt
11	2	9	0	0

*DoW PFAS interim action levels for private drinking water wells (Table 1) 

Table 3: NAS Pensacola 2019 and 2025 Private Drinking Water Well Results

Sample	PFOA (ppt)	PFOS (ppt)	PFOA+PFOS (ppt)	PFNA (ppt)	PFHxS (ppt)	HFPO-DA (ppt)	PFBS (ppt)	Hazard Index
1	ND	ND	ND	ND	ND	ND	ND	NC
2	1.41 J	6.12	7.53	0.56 J	16.46	ND	327.7	1.87
3*	ND	ND	ND	ND	ND	ND	0.24 J	NC
4	ND	0.35 J	0.35	ND	0.65 J	ND	ND	0.07
5	ND	ND	ND	ND	ND	ND	ND	NC
6	ND	ND	ND	ND	0.68 J	ND	ND	NC
7	3.89	6.41	10.3	0.24 J	6.96	ND	4.43 J	0.72
8*	ND	ND	ND	ND	0.21 J	ND	ND	NC
9	ND	ND	ND	ND	ND	ND	0.16 J	NC
10*	3	5.5	8.5	ND	1 J	ND	2.5	0.10
11	2	6.2	8.2	ND	2.1	ND	3.5	0.21

ppt = parts per trillion
HI - Hazard Index; calculated if two or more applicable PFAS (PFNA, PFHxS, HFPO-DA, and PFBS) are detected in the sample. EPA Hazard Index Fact Sheet
ND - not detected
NC = hazard index not calculated because less than two of the applicable PFAS were detected in the sample
J = laboratory estimated value
*For the 3 wells that were sampled in both 2019 and 2025; the highest result for each PFAS is presented.

Figure 2: Private Drinking Water Well Sampling Area – NAS Pensacola




Figure 3: NAS Pensacola 2019 and 2025 Private Drinking Water Well Results

Identification of PFAS Releases at NAS Pensacola

Confirmed and potential release areas at NAS Pensacola were identified during a thorough records review and completion of personnel interviews. Groundwater, surface water, and soil samples were subsequently collected and PFAS were detected in groundwater and soil samples. The potential/suspected PFAS release areas that were investigated are depicted in Figure 4 and listed below. The Navy will continue investigating PFAS at NAS Pensacola in accordance with the CERCLA process and will evaluate whether further actions are needed. To find out more about the environmental investigation at NAS Pensacola, visit the Administrative Record.

Potential/Suspected PFAS Release Areas – NAS Pensacola

1. Current and Former Fuel Farm Site 37 (UST Site 24)
2. Former Fire Training Area 3 and Foam Checks
3. Runway 7R Crash Locations
4. Forrest Sherman Field Fire Truck Staging Areas
5. Foam Checks
6. Site 3 Former Crash Crew Training Area (UST Site 18)
7. Forrest Sherman Field Sludge Disposal Location 1A and 1 B
8. Current Crash Crew Building 1878
9. Air Force Maintenance Hangar Building 4149
10. Forrest Sherman Field Taxiway A3 Aircraft Brake Fire Response
11. Former Plating Operation Building 3221
12. Former Fire Training Area 2
13. Former Fire Training Area 1 (Site 7)
14. Site 1 Sanitary Landfill (OU 1)
15. Current Fire Station Building 4125
16. Current Fire Department AFFF Storage Building 4153
17. Building 1771 Transportation Spill
18. Former Pest Control Shop and Pesticide Mixing Area (Site 24) and Former Pest Control Shop Building 3561
19. Golf Course Maintenance Facility and Pesticide Rinsate Disposal Areas, Site 15 (Buildings 747 and 3447)
20. Temporary Fire Station Building 3374
21. Former Fire Station Building 697 (Demolished)
22. Former Industrial Building Complex Plating Shops
23. Former Electroplating Shop Building 709
24. AFFF Storage Tank Building 684
25. Former Wastewater Treatment Plant (WWTP) OU10
26. Former Chevalier Field
27. Former Fire Department AFFF Storage Building 8 (Demolished)
28. Former Fire Station Building 21 (Demolished)
29. Former Fire Department AFFF Storage Building 51 (Demolished)
30. Waterfront Sediments (Site 2)
31. Former Plating Shop and Photo Lab Building 604
32. Port Operations AFFF Storage Area

Figure 4: PFAS Release Areas – NAS Pensacola

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