Frequently asked questions and answers regarding Environmental Division at Facilities, Marine Corps Air Station Iwakuni

Air Program

A. The daily air quality conditions for Iwakuni, Japan can be found at the web link below.


Air pollution sources on Marine Corps Air Station Iwakuni include incinerators, steam plants, ozone depleting substances (ODS), painting operations and vehicle emissions.
Air pollution can be a threat to human health and the environment. 

Air pollutants can cause damage to trees, lakes, crops, and animals, as well as damage the ozone layer. Air pollution also can cause and intensify haze, reducing visibility for vehicle and air traffic.

Water Program

A. During 2016, the drinking water at MCAS Iwakuni met all Japan Environmental Governing Standards (JEGS) and drinking water health standards. The most recent Consumer Confidence Report can be found at the web link below.
2017 CCR Report
A. MCAS Iwakuni purchases water treated at the Nishimi Water Treatment Plant (WTP) and distributed by the Iwakuni City Water Works Bureau. The drinking water is treated at the Nishimi WTP and is delivered to MCAS Iwakuni which originates from the Nishiki River, a surface water source in Yamaguchi Prefecture. The Nishiki River is the longest river in the prefecture and drains into the Seto Inland Sea.

Spill Program

A: Upon discovering or causing a spill, the individual should take these immediate actions (but only if properly trained):

Tell someone around you to call MCAS Iwakuni Emergency Dispatch Center (EDC) and report the spill at: 119 or 911. If you are able to, or have the training to stop the spill, then let someone else make the call, you focus on the following actions:

  • Shutdown all appropriate valves and/or pumps
  • Restrict all ignition sources and activate/deploy available spill control devices
  • Notify immediate supervisor or others working nearby, and if required, evacuate the area immediately and move to a location upwind of the spill if possible
  • Aid any exposed personnel by assisting in safely removing them from the spill area and requesting medical assistance if needed
  • Secure storm drains and/or waterway entries with covers, booms, or diversion barriers

A: Personnel are required to submit an “OHS After Action Spill Report Form” for all reportable spills.

When filling out this form, personnel should be as detailed as possible in describing who was involved, what happened, when it happened or was spotted, where the spill is located, a detailed list of what was done to stop and/or contain the spill, what supplies were used and how many, how was the spill cleaned up, etc. Do NOT simply list the most basic information and leave it at that. This information is important for future spill prevention and is often briefed to higher levels. So please be specific and detailed.

A: Any spill of POL/HazMat that is:

  • Greater than 5 gallons in volume, or
  • Larger than 15 feet in diameter, or
  • Any substance of any amount that reaches, or may reach, soil, a storm drain, canal, ditch, or open water, or
  • Any POL or HazMat spill that exceeds the spillers training or capability to safely respond and contain the spill.

Spills smaller than the amounts shown above, or that are within hangar bays or areas that already maintain secondary containment, are considered “Contained Releases”. These are “Operational Spills” and do not need to be reported to 911.

Regardless, however, ALL spills MUST be contained and cleaned up immediately without hesitation.

Hazardous Waste Program

A. It is HAZMIN Center located at Bldg. 1645A.

Solid Waste Program

Cultural and Historical Resources

A. Yes. There are four historic sites: the building 360, Zero Hanger, 1st MAW Vietnam War Memorial and Yuhi monument. Two of these resources, the Zero Hanger and the Vietnam Memorial, are designated historic monuments by the Marine Corps Historic Division. There are no known archaeological resources present on base.

Natural Resources

A. Contact PMO Desk Sgt at 253-3303. If in the Airfield, contact Airfield Operations at 253-6242.
A. Please contact Facilities Trouble Desk at 253-3131 or Environmental at 253-5466 immediately.
A. No. Iwakuni white snakes are designated as national treasure. If you find a white snake, you must report to Iwakuni city's cultural resource protection section. Capturing or keeping it is prohibited by the law.
A. MCAS Iwakuni has no known "Japan Natural Monument" species, although some birds on the Japan Environmental Governing Standard (JEGS) list (Threatened and Endangered Species of Wild Fauna & Flora in Japan)  have been observed transiting  through the air station during migratory season. Some "Government of Japan (GoJ)-Protected" ("Red Data Book")  insects and plants have been identified during 2017 survey. However there are no immediate impact on any units or operations on the installation.
A. Contact Base Operations at 253-3553.
A. They are called "Tanuki", Japanese raccoon dog. They are cute and may seem tame, but please do not feed them. They have caused damages on equipment by chewing on wires, and also have caused BASH issues by getting hit by vehicles and aircraft in the Airfield.

Tanks Program

A: MCAS Iwakuni currently has two primary types of tanks used across the installation – Aboveground Storage Tanks (AST’s) and Underground Storage Tanks (UST’s).


A: The majority of tanks readily seen across the base are AST’s typically found within a concrete barrier used as a type of “Spill Prevention Countermeasure” called a “Secondary Containment”. This Secondary Containment area is for safety, and they are designed purposely to hold the entire volume of all liquids stored in the tank, plus an additional 10%, should a tank fail and its contents spill out. This Secondary Containment area is designed to hold and contain liquids and prevent them from flowing out into the open environment, which means many times people will find standing rain water inside this area. Standing rain water is a problem because it takes up volume within the containment area, and if a tank ever failed, the water would displace the total volume needed to contain the leak, thus allowing the leaked fluids to potentially spill over into the open environment. If you see an AST with its Secondary Containment Area full of water – even a few inches – please contact the owner of the tank (typically listed on the tanks Identification Sign) as soon as able to inform them that it needs to be drained.


A: Due to Spill Prevention regulations, water inside this space should never be allowed to flow freely and unsupervised out if the containment area. The purpose of the Secondary Containment area is to protect the environment from a POL spill. If the tank is “leaking”, and the water drained freely and unsupervised, no one would ever know it was leaking. Before long, the tank would be empty, the POL would have contaminated the soil and waters of Japan, and in the event we needed the tank for an emergency, we would only then discover the contents missing and the emergency now worse. Therefore, draining standing rain water from within AST Secondary Containment areas must be a controlled and supervised event, and may only occur after inspecting the water for the presence of a POL “sheen” first. This is the responsibility of the tank owner and can only be accomplished by a properly trained individual.


Training Program (CETEP)

A. From the “Home Page” on this website, then clicking on the “Environmental Training” link on the right side of the page. Once student registration has been complete in the Environmental Learning Management System (ELMS), the student may begin to use the on-line training system. 

If the student does not possess a Common Access Card (CAC) with a “usmc.mil” email address, then similar environmental training courses may be fulfilled through other tutorial methods. Please contact the MCAS Iwakuni CETEP Coordinator at 0827-79-3910 or DSN 253-3910. 

Links: Environmental Learning Management System (ELMS) <www.elms.usmc.mil>

Qualified Recycling Program

A. “QRP” stands for the “Qualified Recycling Program”. Its main purpose is to collect and process recyclable materials generated from residents and contractors on MCAS Iwakuni and turn these items into revenue for Marine Welfare and Recreation (MWR) projects.

A. The MCAS Iwakuni Recycle Center is located at building #7725 near the North Gate Gym.

Hours: Monday – Friday, 7:15 a.m. - 4 p.m.

A. The Recycle Center currently collects and processes the following items:

  • Corrugated Cardboard
  • Aluminum/Steel Cans
  • Paper
  • Magazines/Newspapers
  • Scrap Metal
  • Clothes
  • Soft Plastics
  • Cooking Oil

*The is a 24-hour drop-off site for the following items: Paper, Corrugated Cardboard, and Aluminum/Steel Cans.

Environmental Menu

Contact Information

Environmental Management System:
Environmental Planning:
Water Program:
Air Program:
Spills & Tanks:
Emergency Spill Notification:
From cell phone:
911 / 253-3322
Hazardous Waste:
Solid Waste/Recycling Program:
Culture/Natural Resources:
253-3908 / 3906 / 5423

How to call to MCAS Iwakuni

DSN    253 - ****
Commercial number from Japan  0827-79- ****
Commercial number from U.S.  011-81-827-79- ****
Cell phone number    080 - **** - ****
Commercial number from Japan 080 - **** - ****
Commercial number from U.S. 011-81-80- **** - ****
Cell phone number    090 - **** - ****  
Commercial number from Japan 090 - **** - **** 
Commercial number from U.S. 011-81-90- **** - ****