Water Heater Replacement in Longmont, CO

Does Longmont require a permit for a new water heater?

It does. City of Longmont Building Services requires a permit for any change to electrical, gas, mechanical or plumbing systems, and its permit page names water heaters specifically. The office is at the Development Services Center, 385 Kimbark Street, and can be reached at (303) 651-8332. Most plumbers pull the permit as part of the job and arrange the inspection afterward.

How does Longmont's soft water change things?

Longmont's water is soft. The city's 2025 report puts it at about 1 to 2 grains per gallon, drawn from the St. Vrain Creeks and Colorado-Big Thompson water and treated at the Wade Gaddis and Nelson Flanders plants with chlorine. Soft water means far less scale on elements and less sediment in the tank than in hard-water towns, so a softener is rarely the first thing to budget for. Soft water can be tougher on the anode rod, though, so having it checked every few years is a sensible habit.

Is my house likely to need extra work?

That depends on its age. Longmont's median year built is 1991, with about 37.1% of homes built before 1980, so the city has a mix of older homes near downtown and newer subdivisions. In the older stock, a plumber may need to update a vent, swap an outdated gas connector or add a drain pan. Newer homes are more often a direct swap. Xcel Energy is the gas utility; for a gas odor, leave the house first, then call 911 and Xcel at 1-800-895-2999.

One more Longmont note

If you're replacing a heater because it flooded a basement, check whether the water reached the floor drain or sewer line. Longmont property owners own and maintain the sewer service line from the house to the city main, so any backup on that line is a private repair.

It also pays to replace on your terms rather than the tank's. Northern Front Range winters send colder water into the heater, so an aging unit works hardest and is most likely to quit in the coldest weeks. If yours is past its expected life and showing symptoms, fall is a good time to get quotes, compare tank and tankless options, and schedule the swap and the city inspection without the pressure of a cold house.