Arvada's water is soft to moderately hard. Its water heaters mostly fail from old age, not scale.
Arvada water heaters at a glance
| Water provider | City of Arvada for most of the city (Denver Water's North System via Ralston Reservoir, plus Clear Creek). A few areas are served by other districts. |
|---|---|
| Water hardness | Soft to moderately hard: 2025 averages of 43 mg/L from the Ralston plant and 65 mg/L from the Arvada plant |
| Homes | Median year built 1979 |
| Elevation | About 5,348 feet (USGS reference point) |
| For your water heater | Little sediment, so a tank usually reaches its rated life. The anode rod still wears, so check it every few years. |
Sources: Arvada 2026 water quality report · Census ACS 2019–2023 via Point2Homes · USGS elevation. Checked October 2026.
What Arvada's water does to a water heater
When water is heated, the calcium and magnesium in it drop out as sediment and settle on the bottom of the tank. The burner or lower element then has to heat through that layer, so the heater runs longer, pops and rumbles, and wears faster. Arvada's two treatment plants averaged 43 and 65 mg/L of hardness in 2025, soft to moderately hard. Little sediment, so a tank usually reaches its rated life. The anode rod still wears, so check it every few years.
Olde Town to Candelas
Arvada runs from century-old homes in Olde Town through the postwar ranches in the middle of the city to new construction out west in Candelas and Leyden Rock. With soft water, a well-kept tank can reach its rated life, so in Arvada the question is usually age: once a heater passes about 10 years, replacing it before it leaks is cheaper than cleaning up after one. In the older homes, the shutoff valve and connectors usually get replaced with it.
Repair or replace?
Under about eight years old, with a failed part like a thermocouple, gas valve, heating element, or thermostat, a repair usually makes sense. At about ten years or older, or with any leak from the tank itself, replacement is the better money: a leaking tank can't be fixed. You get the price before any work starts, and most replacements are done the same day they're quoted, with the old unit hauled away. A replacement is also the time to check whether you need an expansion tank (when one is required).
Gas or electric, tank or tankless
We repair and replace both gas and electric water heaters, standard tanks and tankless units. Soft water is easy on a tankless heater. Descale it on the maker's schedule and it should go a long time between service calls.
At about 5,348 feet (Arvada's USGS reference point), a gas water heater has to be rated for the altitude, and a tankless heater set for it at installation. Rinnai and Navien change their tankless settings at 5,400 feet, and elevations vary across the city, so the setting should match your address. What to check at altitude.
Make the next one last
- Flush the tank once a year; with water this soft it won't take long
- Check the anode rod every few years and replace it before it's used up
- Keep the area around a gas heater clear so it gets the combustion air it needs
- Know where the cold-water shutoff on top of the heater is, and how to turn the heater off, before you need to
More reading: water heater leaking? what to do, no hot water troubleshooting, how long water heaters last in Colorado, why a water heater pops or rumbles, and water hardness by city. If your water is hard, a softener protects the heater and every fixture.
Recent water heater work
Photos from our own jobs. Locations and customer details are left out.
More in Arvada: backflow testing in Arvada · all plumbing services in Arvada