St. George Plumbing Company: Plumbing Services for St. George, Utah Homes

What makes plumbing in St. George different

St. George sits in the northeastern corner of the Mojave Desert, at the foot of the Pine Valley Mountains, and its plumbing is shaped by three things: very hard water, a lot of heat, and a building boom that has turned a small cotton-mission town into a metro area of more than 200,000 people. Within a short drive you can find pioneer-era homes near downtown, 1970s and 1980s houses in Bloomington and the older subdivisions, 1990s and 2000s homes across Little Valley and the Washington Fields, and brand-new construction in Desert Color and along the Southern Parkway. Each era came with its own pipe materials and its own typical problems.

Some of the hardest water in Utah

The City of St. George says most water sources in Southern Utah are hard because they carry a lot of calcium and magnesium, and its water quality report suggests softener settings between 13 and 24 grains per gallon (City of St. George, 2024 Drinking Water Quality Report). The city's water department goes further: set a softener at about 18 grains and no higher than 22, because extra softener salt ends up in the reuse water that irrigates parks and golf courses (City of St. George Water Services, Collection and Distribution (FAQ)). Without a softener, that hardness shows up as white crust on fixtures, scale in water heaters and tankless units, and shortened lives for valves, cartridges and appliances.

Heat, garages and attics

The St. George weather station averages about 124 days a year at 90 degrees or hotter, and its all-time high is 117 (Western Regional Climate Center, St. George Temperature Summary; NOAA NCEI, Utah Maximum Temperature Report). Most local homes keep the water heater in the garage, where summer temperatures can climb well past that. Heat is hard on plastic parts, gas controls and expansion tanks, and it can make the "cold" water at the tap run warm through lines that pass through attics or hot ground.

Slabs, soils and slab leaks

Most homes here are built on concrete slabs with water lines under or in the floor. The Utah Geological Survey identifies expansive soil and rock as the most troublesome construction condition in the St. George-Hurricane area, and it also maps collapsible and gypsum-bearing soils (Utah Geological Survey, Geologic-Hazard Maps for the St. George-Hurricane Area). Ground that swells, settles or dissolves can stress pipes and drains under a slab. A sudden jump in the water bill, a warm spot on the floor or the sound of running water when nothing is on are classic signs of a slab leak.

Yes, it freezes

St. George is warm, but not frost-free. The weather station averages roughly 96 nights a year at or below freezing, mostly from November through February, and the record low is minus 11 (Western Regional Climate Center, St. George Temperature Summary). Hose bibs, irrigation backflow assemblies and pipes in garages or exterior walls are the usual casualties, often in homes whose owners assumed the desert never freezes.

Who handles what

The City of St. George delivers drinking water from wells in the Gunlock area and Snow Canyon, from Mountain Springs on Pine Valley Mountain, and from Virgin River water stored at Quail Creek and Sand Hollow reservoirs and treated at the Washington County Water Conservancy District's Quail Creek plant (City of St. George Water Services, Collection and Distribution (FAQ)). The city maintains the mains and meters; the pipes on your side of the meter are yours. Sewage from St. George, Washington, Santa Clara and Ivins is treated at the city's regional plant (City of St. George, Wastewater Treatment), while Hurricane, LaVerkin and Toquerville are served by the Ash Creek Special Service District (Ash Creek Special Service District, About Us).

To report a water main break in St. George, the city lists 435-627-4802 during business hours and its dispatch line, 435-627-4835, after hours (City of St. George Water Services, Collection and Distribution (FAQ)). Other towns have their own numbers on the water bill.

What to do while you wait

• Water running where it should not? Close the main shut-off. In many St. George slab homes it is in the garage near the water heater or where the line enters the house, and there is also a valve at the meter box near the street.
• Water heater leaking? Close the cold-water valve on top of the tank. For an electric heater, switch off its breaker; for gas, turn the control knob to "pilot" or "off."
• Think you have a slab leak? Shut off every fixture and watch the meter. If it keeps moving, close the main until the leak is found.
• Smell gas? Leave the house and call Enbridge Gas Utah, the area's gas utility, or 911 from outside. Do not switch lights or appliances on or off.

Questions worth asking before any plumbing work

• What exactly is wrong, and how was that confirmed (camera inspection, pressure test, acoustic leak detection, thermal imaging)?
• Is the quote a flat price for the job or time and materials, and what could change it?
• Does the job need a permit and inspection? Water heater replacements, sewer work and new piping often do.
• What materials will be used, and what manufacturer warranty comes with new equipment?
• If a slab, wall or the yard has to be opened, who restores it?

Not sure what you need? The guides cover setting a water softener for St. George water, finding your shut-off and checking the meter for leaks, and protecting pipes on freezing nights.

Guides & FAQs

Plain-language answers to common questions.