The actual numbers
| Source | Reported hardness |
|---|---|
| Weber Basin Water Conservancy District (county wholesaler) | ~10–18 grains/gal (171–308 ppm) |
| Farmington City | ~8–10 grains/gal |
| Fruit Heights | ~16 grains/gal (280 mg/L) |
For context, water is generally described as "hard" above about 7 grains per gallon and "very hard" above roughly 10.5. Most of Davis County sits in or above that upper band.
These figures come from the utilities' own consumer confidence reports, which are published annually and worth a look if you're curious about your specific city.
Why hardness varies within the county
Different cities blend different proportions of sources — Weber Basin wholesale water, local wells, and surface water from canyon streams. Blend ratios change seasonally, which is why your water might feel different in August than in March.
That's also why a neighbor two cities over may have a noticeably different experience with spotting.
What hard water actually does around the house
On glass: mineral deposits from sprinkler overspray and runoff. Fresh deposits wipe off. Old ones bond. Full explanation here.
In fixtures: scale on faucets, shower doors, and shower heads.
In appliances: scale buildup in water heaters and dishwashers, which reduces efficiency over time.
In laundry and dishes: soap doesn't lather as well and can leave residue.
Why the window problem specifically is preventable
Here's the thing that frustrates us a little: almost all hard water damage to windows is avoidable, and it's avoidable for free.
It's not the rain. Rain is soft — it evaporated to get into the sky, leaving its minerals behind. It's the sprinklers. Your irrigation is spraying that 10–18 grain water directly onto glass, in the sun, several times a week, all summer.
Adjust the heads that hit the house and you've eliminated most of the problem. It takes ten minutes and costs nothing. How to do it.
Softeners
A whole-home softener helps everything inside the house — fixtures, appliances, laundry.
It generally does not help your windows, because most irrigation systems are plumbed ahead of the softener. Softening water you spray on the lawn would be expensive and mostly pointless, so systems are usually designed that way on purpose.
So even in a softened home, exterior window spotting is still a sprinkler problem, and still solved at the sprinkler head.
Living with it
Hard water isn't a defect, it's just what Wasatch Front water is. The practical response is regular maintenance rather than heroic restoration: keep deposits from establishing, and they never become permanent.
Want an honest read on your glass? We'll tell you what's removable and what isn't before you spend anything. Get a free quote.