Safety and local impacts: pipelines, compressors, well sites and land

Most gas infrastructure is invisible until something goes wrong. A transmission line can sit under a pasture for 60 years. A compressor station can hum on a hillside for decades. Then one day a weld fails, or a contractor's backhoe finds a line nobody marked, or a utility crew forgets a sensing line, and a neighborhood burns. This lesson is about the ordinary impacts neighbors live with and the rare disasters that shape the rules.

How PHMSA counts incidents

Pipeline operators must report incidents above set thresholds to PHMSA. PHMSA publishes the data, going back to 1970, and offers 20-year trend charts you can filter by state and system type (gas transmission, gas gathering, gas distribution, hazardous liquids). A serious incident is one involving a death or an injury requiring in-patient hospitalization. PHMSA warns that changes in reporting rules have shifted the all-incident trend line over time, so compare years carefully and prefer the serious-incident series for long trends.

A pattern holds across years: distribution systems, the small pipes under streets, account for most deaths and injuries, because they run into homes and businesses. Transmission line ruptures are rarer but can be catastrophic when they happen in populated areas. Common causes include excavation damage (someone digging without getting lines marked), corrosion, material and weld failures, equipment malfunction, incorrect operation and natural forces such as floods and landslides.

System	Typical pressure	Main risks	Who inspects
Transmission	High (hundreds to over 1,000 psi)	Corrosion, weld and material failure, outside force	PHMSA, often with state partners
Gathering	Low to high	Corrosion, limited historic oversight	State agency; PHMSA for regulated lines
Distribution	Low (often under 60 psi; some under 1 psi)	Excavation damage, old cast iron and bare steel, over-pressurization	State pipeline safety program

Two disasters that changed the rules

San Bruno, California, 2010

On September 9, 2010, a 30-inch PG&E transmission line ruptured under a residential neighborhood in San Bruno. Eight people died and 35 or 37 homes were leveled (counts differ), with more damaged. Investigators found defective welds, some not fully penetrating the pipe wall, in a section installed in 1956. On the day of the rupture, during electrical work at PG&E's Milpitas terminal, pressure in the line rose above its maximum allowed operating pressure (by about 11 psi in PG&E's account), and a defective weld gave way. The California Public Utilities Commission fined PG&E $1.6 billion in 2015. The disaster drove federal and state requirements for pressure testing of older lines and verifying records of what pipe was actually in the ground.

Merrimack Valley, Massachusetts, 2018

On September 13, 2018, over-pressurized gas flowed into homes served by Columbia Gas of Massachusetts in Lawrence, Andover and North Andover. Explosions and fires hit dozens of homes, one 18-year-old was killed, about 25 people were injured and about 30,000 were evacuated. The NTSB's 2019 report blamed weak engineering management: during a project replacing a cast iron main, the regulator sensing lines were left on the abandoned pipe. The regulators read falling pressure, opened wide and sent high-pressure gas into a low-pressure system. Columbia Gas pleaded guilty to violating federal pipeline safety law, paid a $53 million fine and sold its Massachusetts operations.

Both cases came down to records and procedures. So when a pipeline or utility project comes up near you, ask about records, testing and change management, not just about the pipe.

Compressor stations

Compressor stations are where pipelines meet neighbors. A large station might have several turbines or engines of thousands of horsepower each. The impacts:

• Noise. Steady low-frequency hum, plus occasional loud events. FERC's rule at 18 CFR 380.12(k)(4)(v)(A) says noise from a new or modified station must not exceed a day-night sound level (Ldn) of 55 dBA at any pre-existing noise-sensitive area, such as a home, school or hospital.
• Blowdowns. Planned or emergency venting of gas can be extremely loud for minutes and releases methane.
• Air emissions. NOx, carbon monoxide, formaldehyde from engines, and methane from leaks and venting. Stations need state air permits.
• Lighting and traffic during construction and maintenance.

Well sites

Where gas is produced, the impacts arrive in phases. Drilling and fracking a multi-well pad can mean weeks to months of round-the-clock work, heavy truck traffic carrying water, sand and equipment, bright lights, noise and dust. Once wells are producing, activity drops to tanks, separators, small engines and periodic trucks. Problems neighbors report include air emissions (methane and volatile organic compounds), spills of fluids or produced water, damage to rural roads, and, near disposal wells, earthquakes. EIA, citing the US Geological Survey, says fracking itself can cause small earthquakes that are generally not a concern, while injecting large volumes of wastewater underground can cause larger, damaging ones. Oklahoma's earthquake surge in the 2010s was tied to wastewater disposal, and state regulators cut injection volumes in response.

Setback rules (how far wells must be from homes, schools and water sources) vary widely by state and have been fought over in several legislatures and ballot measures. Look up your state's current numbers rather than repeating another state's.

Eminent domain and landowners

Under the Natural Gas Act, 15 U.S.C. 717f(h), a company holding a FERC certificate of public convenience and necessity can condemn land for a pipeline right-of-way and compressor station sites when it cannot reach agreement with the owner. It files in federal district court where the land sits (if the owner claims more than $3,000) or in state court. Courts then decide compensation, not whether the pipeline should exist; that question was settled when FERC issued the certificate.

For landowners, the practical sequence looks like this:

1. The company contacts owners along proposed routes and asks to survey.
2. The company files at FERC. Landowners can comment and can file to intervene, which preserves their right to seek rehearing and appeal.
3. FERC prepares an environmental assessment or environmental impact statement and takes comments.
4. FERC issues or denies the certificate.
5. The company negotiates easements. Where it cannot, it can file condemnation cases.

Easement terms matter long after construction: width of the permanent right-of-way, restrictions on building and planting, who maintains drainage and fences, crop damage payments, and whether the company can add more pipelines in the same strip. Intrastate pipelines get eminent domain from state law instead, under rules that vary by state.

The fight is genuinely two-sided. Landowner groups argue that companies use the threat of condemnation to push low offers, and that intervening at FERC requires knowledge and timing many rural owners don't have. Pipeline companies argue that without eminent domain, a single holdout could block a line serving millions of customers, and that compensation is set by courts at fair market value.