Ranking · United States
The most mineral-rich hot springs in the US
These springs are ranked by total dissolved solids (TDS), the weight of minerals in a liter of the source water, measured in USGS and state lab samples. Tap water is usually under 500 mg/L, and seawater is about 35,000 mg/L.
Top of the list
Highest-ranked with photos
Crystal Hot Springs
A long-running pool complex in Honeyville, opened as Madsen Hot Springs in 1901, that blends a 120-134°F hot spring with a cold spring less than 50 feet away. It has three mineral hot tubs, a soaker/cave pool, a chlorinated lap pool, an Olympic pool and two water slides. Camping is no longer offered and outside food is not allowed.
Iron Mountain Hot Springs
A modern soaking complex beside the Colorado River with dozens of small mineral pools ranging from about 89 to 112°F. An adults-only (21+) tier adds a sauna area, plunge pools and WorldSprings-style pools, while a family zone serves younger children. Passes are tiered and cheaper when booked online.
Glenwood Hot Springs Resort
A large downtown resort built around the Grand Pool, which stretches more than two city blocks, plus a 104°F therapy pool. The newer Yampah Mineral Baths add three hot pools between roughly 95 and 104°F and two cold-contrast baths, and that area turns adults-only after 5 pm. Day passes are sold without reservations, and the resort runs two hotels on site.
Ranked
Dissolved minerals, 25 springs
| # | Spring | Dissolved minerals | Water type | Type |
|---|---|---|---|---|
| 1 | Crystal Hot SpringsHoneyville, Utah | 43,200 mg/L | Sodium–chloride | Day pools |
| 2 | Iron Mountain Hot SpringsGlenwood Springs, Colorado | 21,650 mg/L | Sodium–chloride | Day pools |
| 3 | Glenwood Hot Springs ResortGlenwood Springs, Colorado | 20,250 mg/L | Sodium–chloride | Resort & lodging |
| 4 | Warm Mineral Springs ParkNorth Port, Florida | 18,000 mg/L | Sodium–chloride | Day pools |
| 5 | Yampah Spa & Vapor CavesGlenwood Springs, Colorado | 17,800 mg/L | Sodium–chloride | Bathhouse |
| 6 | Zion Canyon Hot SpringsLa Verkin, Utah | 9,560 mg/L | Sodium–chloride | Day pools |
| 7 | Belmont Hot Springs RV ParkGarland, Utah | 8,420 mg/L | Sodium–chloride | Day pools |
| 8 | Heise Hot SpringsRirie, Idaho | 5,945 mg/L | Sodium–chloride | Resort & lodging |
| 9 | Wilbur Hot SpringsWilliams, California | 5,564 mg/L | — | Resort & lodging |
| 10 | Meadow Hot SpringsMeadow, Utah | 4,885 mg/L | Sodium–chloride | Wild spring |
| 11 | Goddard Hot SpringsSitka, Alaska | 4,880 mg/L | Sodium–chloride | Day pools |
| 12 | Fountain of Youth Spa & RV ResortNiland, California | 4,650 mg/L | Sodium–chloride | Resort & lodging |
| 13 | Sleeping Buffalo Hot Springs & ResortSaco, Montana | 3,770 mg/L | Calcium–sulfate | Resort & lodging |
| 14 | Baker Hot SpringsDelta, Utah | 3,650 mg/L | Sodium–chloride | Wild spring |
| 15 | Vichy Springs ResortUkiah, California | 3,450 mg/L | Sodium–chloride | Resort & lodging |
| 16 | Durango Hot Springs Resort + SpaDurango, Colorado | 3,340 mg/L | Calcium–sulfate | Day pools |
| 17 | Healing Waters Resort & SpaPagosa Springs, Colorado | 3,320 mg/L | Sodium–sulfate | Resort & lodging |
| 18 | Overlook Hot Springs SpaPagosa Springs, Colorado | 3,300 mg/L | Sodium–sulfate | Bathhouse |
| 19 | Bashford's Hot Mineral SpaNiland, California | 3,290 mg/L | Sodium–chloride | Resort & lodging |
| 20 | The Springs ResortPagosa Springs, Colorado | 3,205 mg/L | Sodium–sulfate | Resort & lodging |
| 21 | Verde Hot SpringsCamp Verde, Arizona | 3,140 mg/L | Sodium–chloride | Wild spring |
| 22 | Arizona Hot SpringBoulder City, NV, Arizona | 2,850 mg/L | Sodium–chloride | Wild spring |
| 23 | Penny Hot SpringsRedstone, Colorado | 2,785 mg/L | Calcium–sulfate | Wild spring |
| 24 | Mystic Hot SpringsMonroe, Utah | 2,720 mg/L | Sodium–sulfate | Resort & lodging |
| 25 | Blackstone HotspringsTruth or Consequences, New Mexico | 2,635 mg/L | Sodium–chloride | Resort & lodging |
How we ranked
Values are the median of lab samples from the monitoring site that best matches the spring source, within about 1–2 miles, from the USGS/EPA Water Quality Portal. Pools are often diluted or cooled, so what you soak in can be milder than the source. Only springs with lab data are ranked. We report measurements only, not health effects.
Every listing is checked against the venue's or land agency's own website. We only include wild springs that a land agency or tourism office publishes. Rules and access change, so confirm before you go. Last verified November 2026.