
Utility flags are used to mark the location of underground utilities, such as gas lines, water pipes, electrical cables, and telecommunications lines. These flags are vital for preventing accidental damage during digging and excavation, which can lead to costly repairs, service disruptions, and even serious injuries. While it may be tempting to remove or mow over these flags, it is essential not to disturb them for safety and regulatory reasons. If you need to mow your lawn, try to manoeuvre around the flags and put them back in their original locations if you need to move them.
| Characteristics | Values |
|---|---|
| Purpose of utility flags | To mark the location of underground utilities, such as gas lines, water pipes, electrical cables, and telecommunications lines |
| Flag colors | Red, yellow, orange, white, pink, blue, purple, and green |
| Color meanings | Red: electrical lines, cables, conduit, and lighting cables; Yellow: gas, oil, steam, petroleum, or other gaseous materials; Orange: land lines, communication systems, signal or alarm lines, or TV cables; White: excavation; Pink: temporary survey markings or unidentified utilities; Blue: water, irrigation, or slurry; Purple: recycled water from wastewater; Green: drain lines and sewers |
| Flag removal | It is illegal to remove utility flags in some states. In New Jersey, flags cannot be removed by anyone for 10 days. In Ohio, the time limit is 7 days. After the time limit, the flags can be removed by the property owner. |
| Mowing around flags | It is recommended to mow or trim around the flags without disturbing them to avoid accidental damage to underground utilities and ensure safety. |
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What You'll Learn

Understand the purpose of utility flags
Utility flags are an essential aspect of construction and excavation projects, serving as visual indicators of underground utilities. These flags are temporary markers that play a crucial role in preventing accidents and ensuring the safety of both workers and the community. Understanding the purpose and significance of these utility flags is vital for all stakeholders involved.
The primary purpose of utility flags is to communicate the presence of underground utilities, such as gas lines, water pipes, electrical cables, and telecommunication lines. Each type of utility is represented by a specific flag colour, following a standard colour code set by the American Public Works Association (APWA). This colour-coding system ensures clear identification of the subsurface infrastructure, enabling construction workers, contractors, and engineers to work safely and efficiently.
For example, red flags indicate underground electric power lines, cables, or conduits, and lighting cables. Yellow flags represent natural gas, oil, steam, petroleum, or other flammable materials. Blue flags signify potable drinking water lines, while green flags indicate storm and sanitary sewers or drainage facilities. Each colour corresponds to a specific type of utility, helping to prevent accidental damage during digging or excavation work.
These utility flags are typically placed before any digging or construction project commences. They serve as warnings to contractors, landowners, and homeowners, ensuring that underground utilities remain undamaged during the project. By following the colour-coded flag system, workers can easily identify the exact type of subsurface infrastructure present, enabling them to take the necessary precautions to avoid damage and minimise risks.
In summary, understanding the purpose of utility flags is crucial for maintaining safety, preventing accidents, and ensuring regulatory compliance during construction and excavation projects. These colour-coded flags serve as vital indicators of underground utilities, helping to safeguard workers, the community, and essential services. By adhering to the standardised colour code system, all stakeholders can effectively navigate construction zones and prevent costly repairs, project delays, and potential hazards.
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Know the legal penalties for removing flags
Utility flags are placed to indicate the approximate location of underground utility lines, such as gas, water, electricity, or telecommunications. They are vital for preventing accidental damage during digging and excavation, which can lead to costly repairs, service disruptions, safety hazards, and even serious injuries. Moving or removing these flags can lead to hazardous situations, such as gas leaks, electrical shocks, or flooding.
Given the safety concerns and regulatory compliance associated with utility flags, removing or tampering with them can result in legal penalties and fines. The specific penalties may vary depending on the state and local laws. For example, in New Jersey, it is a state law that the flags cannot be removed by anyone for a specified period, typically 10 days. After that, the utility companies or their authorized personnel are responsible for removing the flags once the utility work or project has been completed and they have confirmed that it is safe to do so.
If you accidentally remove utility flags, it is crucial to take immediate action to mitigate potential risks. First, assess the situation by trying to recall the exact locations of the removed flags and the corresponding utility they represented. Note the flag colors and their positions if possible. Next, contact your local utility companies and inform them of the accidental removal, providing any details regarding the flag colors and their original locations. They may send a technician to re-mark the utility lines. If you are unsure which utility companies to contact, you can call 811 or your local "Call Before You Dig" service.
While it is generally illegal to tamper with or remove utility flags, the specific legal penalties for removing them may vary depending on the state and local laws. However, it is essential to understand the potential consequences of your actions, as disturbing or damaging utility lines can lead to significant issues. Therefore, it is always advisable to wait for clearance from all relevant parties before removing any flags.
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Learn how to mow around the flags
Utility flags are used to mark the location of underground utilities, such as gas lines, water pipes, electrical cables, and telecommunications lines. Each colour represents a different type of utility. For example, red flags indicate electrical lines, cables, and lighting cables, while yellow flags indicate gas lines. These markers are essential for preventing accidental damage during digging and excavation, which can lead to costly repairs, service disruptions, and even serious injuries.
When mowing your lawn, it is important to mow around the flags and not remove or disturb them. Moving flags can lead to accidental damage to underground utilities, resulting in hazardous situations such as gas leaks, electrical shocks, or flooding. In some states, such as New Jersey, it is illegal to remove the flags for a certain period, typically around two weeks. After that, you can remove the flags and resume your regular mowing routine.
If you need to mow your lawn while the flags are present, try to manoeuvre around them without disturbing their placement. If you need to pick them up, make sure to put them back in the exact same location. This is important for your safety and the safety of the crews working on the construction project.
Additionally, be mindful of any paint markings on the ground near the flags. These markings indicate the presence of underground utilities, and it is crucial to avoid mowing over them. By following these instructions, you can safely mow your lawn while ensuring the integrity of the utility flags and any associated markings.
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Identify the different colours of utility flags
Utility flags are used to mark the location of underground utilities, such as gas lines, water pipes, electrical cables, and telecommunications lines. These flags are essential for preventing accidental damage during digging and excavation, which could lead to costly repairs, service disruptions, and even serious injuries. Each colour of the utility flag represents a different type of utility, and these colours are standardised across the country. Here is a breakdown of the most common colours and their meanings:
Red flags indicate the presence of electrical utilities, such as high-voltage wires, cables, and power lines. These flags are crucial for preventing electrical hazards and avoiding neighbourhood-wide power outages.
Yellow flags signify gas-related utilities, including gas lines, as well as oil, steam, petroleum, or other gaseous materials. Damaging these lines can be extremely dangerous, so caution is necessary when encountering yellow flags.
White flags are used to mark excavation sites, often indicating a city excavation project. The size of the area marked with white flags can give you an idea of the project's scope.
Pink flags are employed as temporary survey markings. Surveyors use these flags to mark their measurements and any unidentified utilities.
It is important to note that while these are the most common colours and their respective utilities, there may be slight variations or additional colours used in different regions. For instance, blue, green, orange, and purple flags are also mentioned as part of the colour-coding system.
Additionally, it is essential to leave these flags undisturbed to prevent accidental damage to underground utilities and avoid hazardous situations. Regulations require these markers to remain in place until the construction project is completed, and removing or tampering with them can result in legal penalties.
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Know what to do if flags are in your yard
Utility flags are placed in your yard by utility companies to mark the location of buried or underground utilities such as gas lines, water pipes, electrical cables, and telecommunications lines. These flags are vital for preventing accidental damage during digging and excavation, which can lead to costly repairs, service disruptions, and even serious injuries.
If you see utility flags in your yard, it is essential that you do not remove or disturb them. Moving flags can lead to accidental damage to underground utilities, resulting in hazardous situations such as gas leaks, electrical shocks, or flooding. It can also cause significant disruptions to essential services and your business, as well as increased costs due to expensive repairs and project delays. In some states, removing or tampering with utility flags can result in legal penalties. Regulations require these markers to remain in place until the construction project is completed.
If you need to mow your lawn and there are utility flags in the way, try to manoeuvre around the flags without disturbing them. If you need to pick them up, make sure to put them back in the exact location they were in before. This is important because each colour of the utility flag represents a different type of utility, and knowing what they signify can help you navigate construction zones safely. For example, red flags indicate electrical lines, cables, and power lines, while yellow flags indicate gas lines.
In some states, there are specific time limits for how long the flags must be left undisturbed. For example, in New Jersey, flags cannot be removed by anyone for 10 days, after which they can be removed. In Ohio, the time limit is 7 days. After this period, the flags can be removed, and the customer may be charged for the labour.
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Frequently asked questions
Yes, you can mow around the flags. However, it is important to not disturb or remove the flags as they indicate the presence of underground utilities and help prevent accidents.
Each colour of the electric company flag represents a different type of utility. Here are some common colours and their meanings:
- Red: Electrical lines, cables, and power lines.
- Yellow: Gas, oil, steam, petroleum, or other gaseous materials.
- Orange: Communication systems such as signal or alarm lines, or TV cables.
- Blue: Water, irrigation, or slurry, usually drinking water.
- Purple: Recycled water from wastewater, suitable for landscape irrigation.
- Green: Drain lines and sewers.
The flags should be left undisturbed for at least two weeks to protect the contractor. After that, if the construction work is complete, you can remove the flags. In some states, there are specific laws regarding the duration; for example, in New Jersey, the flags cannot be removed by anyone for 10 days.










































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