Draper is served by two separate water systems, and only one of them publishes a hardness figure. WaterPro’s 2026 report gives an average of 184.1 mg/L (about 10.8 gpg), which is hard enough that most tankless heaters in Draper should be flushed every year. Before you lean on that number, check which system your home is on.
Start with your water bill
The City of Draper’s utilities page names the two systems: Draper City and WaterPro, which also operates as Draper Irrigation. They are separate utilities with separate sources and separate water quality reports, and the name on your bill tells you which one you’re reading about.
Draper City’s system buys its water from the Jordan Valley Water Conservancy District. Its 2025 Annual Water Quality Report says the water comes from groundwater and surface water. The report doesn’t list a hardness figure. For background, the Jordan Valley district says about twenty percent of its supply is groundwater pumped from wells around the valley, with most of the rest coming from Provo River reservoirs such as Jordanelle and Deer Creek. That describes the district’s water as a whole, not the water at a Draper tap.
WaterPro supplies its customers from four deep wells and eight streams, with an auxiliary connection to the Jordan Valley district for times of high demand. Its report for the 2025 water year is where Draper’s only published hardness number comes from.
Neighbors on different systems can have different water. Since neither utility publishes hardness by neighborhood, a test strip at your own kitchen tap is the surest guide. Test cold water that hasn’t passed through a softener, and note which system you’re on when you record the result.
Reading WaterPro’s hardness figure carefully
WaterPro’s report lists an average total hardness of 184.1 mg/L. Converted at the standard rate, that’s about 10.8 gpg. Take it with some caution, for two reasons.
First, it describes WaterPro water only, which is part of Draper, not all of it. A Draper City customer shouldn’t assume it applies to their tap. Second, the table it comes from is identical to the Jordan Valley table printed in at least one other city’s report. It may be the wholesale district’s data rather than a measurement of WaterPro’s own wells and streams. We use it because it is the only hardness figure published for any part of Draper, and we say plainly that it’s a low-confidence one.
What the figure means if it’s close
If your tap tests near WaterPro’s number, here’s where you stand:
- Over the limits for Takagi (7 gpg), A.O. Smith (7 gpg) and Bosch (100 ppm). Those owners should be looking at treatment.
- Under the limits for Navien (12 gpg), Rinnai (200 ppm) and Rheem (200 ppm), but past the USGS line for “very hard,” which starts at more than 180 mg/L.
Noritz describes the need plainly: periodic flushing in hard-water areas. A yearly flush is the floor for everyone.
What’s typical in Draper homes
The water data carries one practical lesson for Draper households: in a city with two systems, advice about “Draper water” only applies to part of the city. If a neighbor says their heater has never needed a flush, they may be on the other system.
Watch the heater as well as the calendar. Lukewarm water during a long shower, a heater that cuts out at high flow, or a service code are all reasons to call. Our no hot water page covers the common causes.
Sandy
Sandy, Draper’s neighbor to the north, gets water a different way again. The city buys from the Metropolitan Water District of Salt Lake & Sandy, which delivered 18,224 acre-feet of water to Sandy in fiscal year 2025. Sandy’s 2026 water quality report says its surface water comes from Little Cottonwood Creek, Bell Canyon Creek, and the Ontario Drain Tunnel, plus water stored in Deer Creek and Jordanelle reservoirs.
Sandy also has 16 wells, which typically pump only in summer to meet high demand. So Sandy’s tap water can include more groundwater in summer than in winter.
The report doesn’t publish a hardness figure that we could read. Its data table is an image, and the district publishes no hardness number we could find. Softener sellers quote figures for Sandy, but none from an official source, so we don’t repeat them. A test strip at the tap, ideally once in summer and once in winter, will tell a Sandy tankless owner more. Sandy requests go through this page.
Services in Draper and Sandy
- Flush and descale: yearly on either Draper system unless your test reads soft.
- Annual maintenance: the flush plus filter, venting and condensate checks.
- Repair: codes, cold bursts or no hot water.
- Installation: replacements and tank-to-tankless conversions.
- Scale prevention: most relevant for Takagi, A.O. Smith and Bosch owners.
HomeAdvisor reports homeowners spending $150–$250 on a tankless flush.