Orem’s water report gives a hardness range of 7–25 gpg, or 120–428 mg/L. That spread is the whole story for a tankless owner in Orem: depending on which source reaches your house, your heater could be running on water near the strictest brand limit or on water roughly double the most lenient one. Plan on a yearly flush and test your own tap before deciding on a softener.
Two kinds of water in one system
Orem’s latest Consumer Confidence Report (2025 data) says the supply is about 60% surface water and 40% groundwater. The two halves are very different.
The surface water comes from the Central Utah Water Conservancy District, which treats it at the Don A. Christiansen Regional Water Treatment Plant. Orem’s report lists that plant’s water at 112–154 mg/L, which works out to about 6.5–9 gpg. That’s the softer end.
The groundwater comes from two mountain springs and nine deep wells spread across the city. The report doesn’t break hardness out by well, but the top of Orem’s overall range sits far above anything the treatment plant delivers. The hard water has to be coming from the wells and springs.
So the city’s supplier listing, Central Utah Water Conservancy District (treated surface water) plus Orem's own springs and wells, really describes two different waters.
Where your tap lands matters
Here’s how the two ends of Orem’s range compare with manufacturers’ published limits:
| Limit | Low end of Orem’s range | High end |
|---|---|---|
| Takagi, 7 gpg | At the limit | Far over |
| Bosch, 100 ppm | Over | Far over |
| Navien, 12 gpg | Under | Far over |
| Rinnai, 200 ppm | Under | Far over |
The USGS calls anything more than 180 mg/L “very hard”. Most of Orem’s range clears that bar.
So two Orem neighbors with the same heater could have very different experiences, and a flush interval that works on one street may be too long on another. A hardness strip at the kitchen tap, cold water, takes the guessing out. If you read near the top of the range, a softener is worth pricing. If you read near the bottom, a yearly flush may be all the heater needs. Since the mix can shift, one low reading isn’t the final word; test again a few months later before ruling out a softener.
Bosch owners have the least room. Bosch sets its limit lower than any other brand here, says descaling may be needed periodically, where water is highly mineralized, and lists the symptoms of scale as lower flow rates, A7 and E9 codes and boiling sounds. Even the softest water Orem reports is over the Bosch line.
What’s typical in Orem homes
Orem is a big system. The city produced 8.7 billion gallons of drinking water in 2025, drawn from the treated surface water and groundwater described above.
What the data does suggest is that the water’s hardness at your heater isn’t fixed. In a blended system, the share each source contributes can shift, and the city’s report gives a range rather than a single average. If your heater has been fine for years and suddenly throws a scale or overheat code, a change in the water reaching your home is one possible cause. Navien’s E016, for example, means the heat exchanger is overheating, and flushing the heat exchanger is one of the listed remedies. After a flush, ask the technician how much scale came out; over a few years, that’s a rough gauge of how hard your share of Orem’s water runs.
Orem services
| Service | Why it matters on Orem water |
|---|---|
| Flush and descale | Removes scale from the heat exchanger; the job most Orem heaters need yearly |
| Annual maintenance | Adds filter cleaning and a full check, so changes in scale are caught early |
| Repair | For overheat codes, temperature swings or no hot water |
| Installation | New or replacement units, ideally with isolation valves for future flushes |
| Scale prevention | Worth it if your tap tests near the top of Orem’s range |
For budgeting only, HomeGuide places a professional flush somewhere between $150 and $350; the technician quotes the real figure.
Lindon
Lindon, on Orem’s northern edge, runs its own small system. Its drinking water comes from Lindon City springs and wells, which the city describes as springs east of town and wells spread through it. The 2025 Water Quality Report lists 4 wells and 1 spring, the spring being Dry Canyon Spring No. 1.
That report doesn’t publish a hardness figure. It’s an image-only document, and neither it nor the city’s water page has a hardness row. The report does list total dissolved solids of 500 mg/L. TDS includes the calcium and magnesium that cause scale, along with other minerals, so it isn’t a hardness reading.
For a Lindon tankless owner, the practical advice is to test the tap and check the manual’s limit. Lindon’s water department can also tell you which of its wells or the spring usually serves your street. Lindon homeowners can request a technician through this page.