Cost So Far
$82.3M
Money already spent on the evaluation and cleanup of hazardous sites.
Expected Additional Cost
$17.6M
The estimated amount of money needed for evaluation and cleanup of hazardous sites at this installation.
Expected Completion Date
2046
The date by which the DOD estimates cleanup of all sites will be complete. Long term monitoring may continue after this date.
16 Hazardous Sites
Below are the locations of hazardous sites associated with this military installation, according to the DOD. A site’s contamination may affect a much larger area, including public and private lands and the water supplies beneath them.
High Risk
Medium Risk
Low Risk
Risk Not Evaluated or Not Required
Response Complete
We haven't independently confirmed the location of every site. If you notice a site placed at the incorrect location, please contact us.
Not all sites in the DOD data include location information, so there may be sites listed below that are missing from the map. The risk level of a site refers to a relative risk assessment made by the DOD to prioritize the cleanup of sites.
Land Controls & Restrictions
Many sites have been declared “clean” by the DOD but are still not safe for people. This military installation is safe only with the following conditions in place: deed restrictions, fences, barriers. see more » annual written certification of compliance with lucs a deed restriction is documented in the parcel deed. a fence around controlled area, with or without gate. a barrier, including but not limited to a paved surface or landfill cap, must be maintained in order to prevent exposure to contaminants, including vapor intrusion into an enclosed structure. prohibits disturbance of surface or subsurface soil due to invasive activities such as construction, unless prior written approval of the navy and lead regulatory agency is obtained. groundwater use restricted. « see less
4 Active Sites
Sites where military cleanup actions are still ongoing. The risk level of a site refers to a relative risk assessment made by the DOD, which prioritizes the cleanup of sites that pose greatest threat to safety, human health, and the environment.
Site ID: SITE 00007
SOUTH WEYMOUTH NAS
Waste Treatment Plant
Cost
$592K
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
Mar 2016
This site is under ongoing monitoring until Apr 2047
Contaminated Areas
Groundwater: Medium Risk
Contaminants: Manganese and compounds 4270000.0 ppb
Soil: Low Risk
Contaminants: DDT 1.0 ppb Benzo[a]pyrene 3.6 ppb Benzo(b)fluoranthene 6.1 ppb Arsenic (cancer) 6.1 ppb
Site ID: UXO 000001
SOUTH WEYMOUTH NAS
Unexploded Munitions and Ordnance Area
Cost
$3.16M
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
Aug 2016
This site is under ongoing monitoring until Aug 2046
Contaminated Areas
Sediment (Fresh): High Risk
Contaminants: Lead 402.0 ppb Zinc 4200.0 ppb
Sediment (Human): High Risk
Contaminants: Lead 402.0 ppb Zinc 4200.0 ppb
Soil: High Risk
Contaminants: Tetryl 0.13 ppb HMX 2.7 ppb TNT 3.11 ppb Chromium 42.8 ppb Lead 59.3 ppb Copper and compounds 67.2 ppb Zinc 705.0 ppb
Groundwater: Risk Not Evaluated
Site ID: UST 000001
SOUTH WEYMOUTH NAS
Underground Storage Tanks
Cost
$5.12M
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
Sep 2013
Contaminated Areas
Soil: High Risk
Contaminants: Naphthalene 4.9 ppb Perchloroethylene 1500.0 ppb
Site ID: SITE 00011
SOUTH WEYMOUTH NAS
Spill Site Area
Cost
$2.92M
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
Nov 2013
Contaminated Areas
Groundwater: Medium Risk
Contaminants: Benzene 7800.0 ppb Acetone 33000.0 ppb o-Xylene 43000.0 ppb Ethyl benzene 130000.0 ppb Trichloroethylene (TCE) 180000.0 ppb Carbon Dichloride 96000000.0 ppb
Soil: Medium Risk
Contaminants: Carbon Dichloride 87000.0 ppb
Sediment (Fresh): Risk Not Evaluated
Sediment (Human): Risk Not Evaluated
Surface Water (Fresh): Risk Not Evaluated
Surface Water (Human): Risk Not Evaluated
Surface Water (Marine): Risk Not Evaluated
12 Inactive Sites
Sites where military cleanup actions are complete, according to the DOD. Note that this status does not necessarily mean the site is no longer hazardous, as many of these sites are put under long-term monitoring or other restrictions.
Site ID: AOC CLSOUT
SOUTH WEYMOUTH NAS
Spill Site Area
Cost
Unknown
Final Cleanup Action
Sep 2006
This site is under ongoing monitoring until Mar 2016
Site ID: SITE 00002
SOUTH WEYMOUTH NAS
Surface Disposal Area
Cost
$2.89M
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
May 2004
This site is under ongoing monitoring until Dec 2045
Contaminated Areas
Groundwater: Medium Risk
Contaminants: Chloroform 2000.0 ppb Manganese and compounds 14100000.0 ppb Iron 79600000.0 ppb
Sediment (Human): Medium Risk
Contaminants: Arsenic (cancer) 6.5 ppb PCB 23.0 ppb Lead 90.9 ppb Iron 45500.0 ppb
Surface Water (Human): Medium Risk
Contaminants: Acetone 3000.0 ppb Carbon disulfide 5000.0 ppb Manganese and compounds 3570000.0 ppb Iron 16600000.0 ppb
Soil: Low Risk
Contaminants: Arsenic (cancer) 4.1 ppb Benz(a)anthracene 8.7 ppb Iron 11900.0 ppb
Site ID: SITE 00006
SOUTH WEYMOUTH NAS
Underground Tank Farm
Cost
Unknown
Final Cleanup Action
Jan 1997
This site is under ongoing monitoring until Feb 2004
Contaminated Areas
Groundwater: Low Risk
Contaminants: Manganese and compounds 458000.0 ppb Aluminum 494000.0 ppb
Sediment (Human): Low Risk
Contaminants: Naphthalene 0.1 ppb Bis(2-ethylhexyl)phthalate (DEHP) 0.23 ppb Benzo[k]fluoranthene 0.23 ppb Anthracene 0.24 ppb Benzo[a]pyrene 0.33 ppb Indeno[1,2,3-cd]pyrene 0.38 ppb Benzo[b]fluoranthene 0.52 ppb Benz[a]anthracene 0.53 ppb Chrysene 0.55 ppb Fluoranthene 1.3 ppb Pyrene 1.4 ppb Phenanthrene 1.4 ppb Butyl benzyl phthalate 5.3 ppb
Surface Water (Fresh): Low Risk
Contaminants: Lead 5800.0 ppb
Surface Water (Human): Low Risk
Contaminants: Lead 5800.0 ppb
Site ID: SITE 00008
SOUTH WEYMOUTH NAS
Above Ground Storage Tank
Cost
Unknown
Final Cleanup Action
May 2003
Contaminated Areas
Groundwater: Medium Risk
Contaminants: Lead 11500.0 ppb Aluminum 16600000.0 ppb Iron 21900000.0 ppb
Surface Water (Human): Medium Risk
Contaminants: Arsenic (cancer) 26500.0 ppb Chromium VI and compounds 34600.0 ppb Zinc phosphide 216000.0 ppb
Soil: Low Risk
Contaminants: Bis(2-ethylhexyl)phthalate (DEHP) 0.1 ppb Arsenic (cancer) 3.1 ppb Aluminum 3070.0 ppb
Site ID: UST 000003
SOUTH WEYMOUTH NAS
Underground Storage Tanks
Cost
Unknown
Final Cleanup Action
Oct 1997
This site is under ongoing monitoring until Jul 1998
Contaminated Areas
Groundwater: High Risk
Contaminants: Benzene 28000000.0 ppb
Soil: Medium Risk
Contaminants: Benzene 132.0 ppb
Site ID: UXO 000002
SOUTH WEYMOUTH NAS
Unexploded Munitions and Ordnance Area
Cost
Unknown
Final Cleanup Action
Feb 2005
Site ID: SITE 00004
SOUTH WEYMOUTH NAS
Fire/Crash Training Area
Cost
$1.11M
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
Sep 2004
This site is under ongoing monitoring until Apr 2046
Contaminated Areas
Groundwater: Medium Risk
Contaminants: Lead 5100.0 ppb Zinc 3990000.0 ppb Iron 16000000.0 ppb Manganese and compounds 16400000.0 ppb
Sediment (Human): Low Risk
Contaminants: Benzo[a]pyrene 2.6 ppb Benzo(b)fluoranthene 3.1 ppb Arsenic (cancer) 4.4 ppb
Soil: Low Risk
Contaminants: Benzo(b)fluoranthene 1.2 ppb Methylnaphthalene,2 15.0 ppb Aluminum 21200.0 ppb
Surface Water (Human): Low Risk
Contaminants: Carbon disulfide 4000.0 ppb Bis(2-ethylhexyl)phthalate (DEHP) 6000.0 ppb
Site ID: SITE 00001
SOUTH WEYMOUTH NAS
Landfill
Cost
$2.76M
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
May 2012
This site is under ongoing monitoring until Sep 2046
Contaminated Areas
Groundwater: Medium Risk
Contaminants: Arsenic (cancer) 21500.0 ppb Lead 61200.0 ppb Chromium VI and compounds 233000.0 ppb Aluminum 81500000.0 ppb Iron 139000000.0 ppb
Sediment (Human): Medium Risk
Contaminants: Antimony and compounds 3.9 ppb Arsenic (cancer) 18.9 ppb Aluminum 3840.0 ppb Iron 44900.0 ppb
Soil: Medium Risk
Contaminants: Arsenic (cancer) 22.8 ppb PCBs 46.0 ppb Aluminum 14100.0 ppb Iron 85400.0 ppb
Surface Water (Human): Low Risk
Contaminants: Barium and compounds 33200.0 ppb Zinc 60500.0 ppb Manganese and compounds 596000.0 ppb Iron 4230000.0 ppb
Site ID: SITE 00005
SOUTH WEYMOUTH NAS
Leach Field
Cost
Unknown
Final Cleanup Action
Jan 2006
Contaminated Areas
Groundwater: Medium Risk
Contaminants: Lead 111000.0 ppb Manganese and compounds 1100000.0 ppb Iron 86100000.0 ppb
Sediment (Human): Low Risk
Contaminants: PCB 0.33 ppb Benzo(b)fluoranthene 3.1 ppb Iron 22300.0 ppb
Surface Water (Human): Low Risk
Contaminants: 1,1,1-Trichloroethane 3000.0 ppb Manganese and compounds 606000.0 ppb Iron 6210000.0 ppb
Soil: Risk Not Evaluated
Site ID: UST 000004
SOUTH WEYMOUTH NAS
Underground Storage Tanks
Cost
Unknown
Final Cleanup Action
Sep 1997
This site is under ongoing monitoring until Feb 2000
Contaminated Areas
Groundwater: Medium Risk
Contaminants: Ethylbenzene 22000.0 ppb Naphthalene 27000.0 ppb
Soil: Medium Risk
Contaminants: Ethylbenzene 7.1 ppb Naphthalene 100.0 ppb
Site ID: SITE 00003
SOUTH WEYMOUTH NAS
Landfill
Cost
$125K
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
Mar 2012
This site is under ongoing monitoring until Aug 2022
Contaminated Areas
Groundwater: Low Risk
Contaminants: Heptachlor epoxide 10.0 ppb Chlordane, alpha- (2) 40.0 ppb Carbon disulfide 4000.0 ppb
Soil: Low Risk
Contaminants: DDE,4,4- 0.01 ppb Benz(a)anthracene 0.4 ppb Zinc 373.0 ppb Iron 11500.0 ppb
Site ID: UST 000002
SOUTH WEYMOUTH NAS
Underground Storage Tanks
Cost
Unknown
Final Cleanup Action
Jun 1997
This site is under ongoing monitoring until Aug 1998
Update (Dec. 5, 2017): We have changed the source of the installation cost data after being notified by the Department of Defense that they erroneously reported their own cost figures on the DERP website. We are now displaying the costs the department says are the most accurate available, from the Pentagon’s DERP database that we received in a FOIA request.
Note: The risk level of a site refers to a relative risk assessment made by the DOD to prioritize the cleanup of sites.
Data: All data comes from the Defense Environmental Restoration Program and the U.S. Army Corps of Engineers, and will be released soon at the ProPublica Data Store. Read our methodology »