Natural gas is one of the most practical and widely used energy sources in Colorado homes. It powers furnaces, water heaters, ranges, fireplaces, and dryers in the majority of houses across Highlands Ranch, from the established neighborhoods near Southridge and Eastridge to the newer builds along the southern stretches toward Lone Tree. Most of the time, the system works quietly and reliably in the background.
When something goes wrong with a gas line, however, the stakes are high. Gas leaks are a genuine safety emergency. They carry risks of fire, explosion, and carbon monoxide exposure that demand a fast, informed response. The most important thing a homeowner can do is know how to recognize the warning signs before a situation becomes dangerous.
Our team works as home service professionals throughout Highlands Ranch and across the surrounding Front Range communities, and gas line concerns are among the calls we take most seriously. Here are seven warning signs that a gas line may be leaking in or around your home, and what to do if you encounter any of them.
1. The Smell of Rotten Eggs or Sulfur
Natural gas in its raw form is odorless. Gas utilities add a chemical called mercaptan specifically so leaks can be detected by smell. Mercaptan has a distinctive odor that most people describe as rotten eggs or sulfur, and it’s unmistakable once you’ve encountered it.
If you notice this smell anywhere in your home, even faintly, take it seriously. A faint odor doesn’t mean a small problem. It may mean the leak is at some distance from where you’re standing, or that ventilation in the home is diluting a more significant release. The smell of mercaptan at any intensity is reason to act immediately.
Do not try to locate the source of the smell yourself. Do not turn lights or appliances on or off. Leave the home, leave the door open as you go, and call 911 and your gas utility from outside or from a neighbor’s home. Gas line diagnosis and repair requires licensed professionals with the right detection equipment, and it is not a situation where investigation by a homeowner adds any value.
2. A Hissing or Whistling Sound Near Gas Lines or Appliances
Gas escaping from a line or fitting under pressure produces a sound. Depending on the size of the leak and the pressure in the line, it may be a faint hiss, a soft whistle, or a more pronounced rushing noise. This sound is most likely to be heard near the gas meter, along exposed sections of gas piping, or behind appliances connected to gas lines such as a range, dryer, or water heater.
In Highlands Ranch homes, gas lines often run through utility rooms, crawl spaces, and along garage walls before connecting to appliances throughout the house. Any unusual sound coming from those areas that wasn’t there before warrants attention.
A hissing sound near a gas line is not something to investigate further before calling for help. Shut off the gas at the meter if you can do so safely from outside and without using any electrical switches or creating sparks, evacuate the home, and contact your gas utility and a licensed professional.
3. Dead or Discolored Vegetation in Specific Outdoor Areas
Underground gas lines run beneath yards and landscaping throughout Highlands Ranch, connecting homes to the utility’s distribution system. When a buried line develops a leak, the escaping gas displaces oxygen in the soil around it. Plants and grass directly above the leak are deprived of what they need and begin to die off, often in a pattern that doesn’t match the surrounding landscape.
If you notice a distinct patch of dead, dying, or unusually discolored grass or plants in your yard and there’s no obvious explanation for it, a leaking underground gas line is something to consider. This sign is particularly meaningful if the affected area follows a linear path across the yard, which often corresponds to the route of a buried line.
Other outdoor indicators can include soil that looks disturbed or frosted in dry weather, small bubbles appearing in puddles or standing water after rain, or a sulfur odor near a specific outdoor area even when no smell is present inside the home.
4. Unexpected Increases in Your Gas Bill
A gas bill that runs noticeably higher than usual without a clear explanation is worth investigating. If your usage patterns haven’t changed significantly, the weather has been consistent with prior years, and no new gas appliances have been added, a spike in consumption may point to gas escaping somewhere in the system before it reaches the appliances it’s supposed to be powering.
This is not a definitive sign of a leak on its own. Higher bills can also result from appliances running less efficiently, thermostat adjustments, or changes in how the home is being used. But when a billing increase is unexplained and persistent across multiple months, adding it to the picture alongside other symptoms is worthwhile.
A licensed professional conducting a gas line inspection and leak detection can use pressure testing and gas detection equipment to confirm whether the line is losing volume, locate where any loss is occurring, and assess the condition of fittings, connectors, and flexible line sections throughout the system.
5. Visible Damage to Gas Lines or Connections
Gas lines and their connections are not immune to physical damage. Flexible connectors behind appliances can crack or corrode over time. Fittings at the meter or along exposed runs of pipe can develop corrosion, especially in areas with moisture exposure. Lines routed through garages or utility spaces can be damaged by impact, renovation work, or shifting in the structure.
During our service calls in Highlands Ranch homes, we occasionally find flexible gas connectors behind ranges or dryers that are visibly corroded, kinked, or showing signs of age. These components have a finite lifespan and don’t always give obvious warning before they fail. Any visible rust, corrosion, or physical damage on a gas line or its fittings is reason to have a professional evaluate the connection rather than wait to see if a problem develops.
Signs to look for include:
- Rust or orange discoloration on metal fittings or pipe sections
- Visible cracks or brittleness on flexible connectors behind appliances
- Fittings that appear loose or show signs of having been disturbed
- Pipe sections that have been bent, kinked, or impacted by stored items or renovation work
- Connections at the meter that show corrosion or are covered in moisture or debris
6. Physical Symptoms in People or Pets at Home
Low-level gas exposure doesn’t always produce a noticeable smell, particularly when ventilation partially dilutes the concentration. In some cases, the first indication of a problem is how people or animals in the home feel rather than anything they can smell or see.
Symptoms associated with natural gas exposure at low concentrations include:
- Headaches that appear frequently at home but resolve when away from the house
- Dizziness or lightheadedness without another explanation
- Nausea that seems tied to time spent indoors
- Fatigue or difficulty concentrating that improves when outside
- Eye or throat irritation that doesn’t correspond to illness or allergies
Pets, particularly dogs and cats, often respond to gas exposure before humans do because of their smaller body size and lower tolerance thresholds. Unusual lethargy, disorientation, or reluctance to enter certain areas of the home in an otherwise healthy animal is worth paying attention to.
If multiple people or animals in the home are experiencing unexplained symptoms, get everyone outside into fresh air immediately and contact emergency services. Do not re-enter the home until it has been inspected and cleared.
7. Appliances That Aren’t Performing as Expected
Gas-powered appliances depend on a consistent and adequate supply of gas to operate correctly. When pressure in the line drops because gas is escaping somewhere in the system, appliances may respond with reduced or inconsistent performance. This is a subtler sign than the others on this list, but it’s one worth including because it can appear before other symptoms become obvious.
Signs that appliances may be receiving insufficient gas include:
- A furnace that struggles to maintain set temperatures or cycles on and off more than usual
- A gas range with burners that light inconsistently or produce flames that are smaller or more orange than usual rather than the clean blue they should be
- A water heater that takes longer than normal to deliver hot water or runs out quickly
- A gas fireplace that won’t light or produces a weaker flame than it previously did
These symptoms can also result from appliance issues unrelated to the gas supply, which is why they’re better understood as one piece of a larger picture. If reduced appliance performance appears alongside any of the other signs on this list, the combination makes a gas line inspection the appropriate next step. Our team handles furnace and appliance service and can coordinate a gas line evaluation as part of the same visit.
What to Do If You Suspect a Gas Leak
The response to a suspected gas leak follows a specific set of priorities, and knowing them in advance matters:
- Do not operate any electrical switches, light switches, or appliances. Electrical sparks can ignite gas that has accumulated in an enclosed space.
- Do not use your phone inside the home. Step outside before making any calls.
- Leave immediately and leave the door open. Opening a door as you leave helps ventilate the space without creating a spark.
- Do not try to locate or fix the leak yourself. Gas line work requires licensed professionals with detection equipment and the training to work safely with pressurized gas systems.
- Shut off the gas at the exterior meter only if you can do so safely and only if you know how. If there is any uncertainty, leave that step to emergency responders.
- Call 911 and your gas utility from outside or from a neighbor’s home. In Colorado, Black Hills Energy and Xcel Energy both have 24-hour emergency lines specifically for gas leaks.
- Do not re-enter the home until cleared by emergency services.
Once the immediate emergency has been addressed and the utility has confirmed the home is safe to re-enter, a licensed plumber or gas line professional should inspect the full system to identify the source of the leak and assess whether additional repairs are needed before gas service is restored.
Understanding Gas Line Maintenance in Highlands Ranch Homes
Gas lines are durable and generally low-maintenance, but they are not maintenance-free. Fittings age, flexible connectors have a service life, and underground lines can be affected by soil movement, corrosion, and the kind of gradual ground shifting that happens over decades in Colorado’s variable freeze-thaw cycle.
Homes in Highlands Ranch that haven’t had their gas lines professionally inspected in several years, or that have older appliances still connected to original flexible connectors, are worth having evaluated. A plumbing leak detection and inspection that includes the gas system gives homeowners an accurate picture of where the system stands and what, if anything, needs attention before a problem develops.
Keeping Your Highlands Ranch Home Safe
Gas leaks are one of the situations where speed and the right information genuinely matter. Knowing the warning signs means you’re not second-guessing yourself when something feels off, and a fast response to any of the signs above is always the right call.
Salzano Services works with homeowners throughout Highlands Ranch and across the Front Range, providing gas line services, plumbing inspections, and the kind of straightforward guidance that helps families make informed decisions about their homes. If you have concerns about your gas lines or want a professional evaluation of your system, contact our team today and we’ll make sure your home is safe and your gas system is working the way it should.