Gallup Water Hardness & Quality Report (2026)
Water Hardness
20.8 grains per gallon
Source
groundwater
pH Level
8.5
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
1071.1 mg/L
Est. Daily Cost
$0.95
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Gallup, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Gallup | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Gallup compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Gallup, New Mexico | 356 mg/L | 3.6 ppt | 🔴 Very Hard | groundwater |
| Farmington, New Mexico | 126 mg/L | 2 ppt | 🟠 Hard | groundwater |
| Durango, Colorado | 149 mg/L | 5.2 ppt | 🟠 Hard | reservoir |
| Rio Rancho, New Mexico | 101 mg/L | 1.8 ppt | 🟡 Moderately Hard | groundwater |
| South Valley, New Mexico | 428 mg/L | 4.1 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Gallup compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Gallup | 356 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Gallup's Water Unique?
Local geology and source profile
Gallup, New Mexico, in McKinley County in the high desert of northwest New Mexico — a crossroads city on Route 66 and Interstate 40 serving as an economic hub for the surrounding Navajo Nation and Zuni Pueblo communities — receives its municipal water from the City of Gallup Water Division in partnership with the Fort Defiance Regional Water System, drawing from the Cibola County surface reservoirs, local groundwater wells, and the regional San Juan Basin water infrastructure serving this high-plateau Colorado Plateau community.
The very hard 356 mg/L hardness and extreme TDS of 1,071.1 mg/L reflect the Colorado Plateau/San Juan Basin's intense desert geology. The Gallup area sits within the San Juan Basin — a structural basin containing thick sequences of Cretaceous Gallup Sandstone, Mancos Shale (calcareous marine shale), and Mesaverde Formation along with deeper Permian carbonate and evaporite formations. The arid Colorado Plateau climate concentrates dissolved minerals in both groundwater and surface water through intense evaporation, and prolonged water-rock contact in these Mesozoic marine formations releases substantial calcium, magnesium, sulfate, and sodium ions. The result is water with near-extreme hardness and TDS values reminiscent of some of the most challenging western US supplies.
At 356 mg/L, Gallup residents face extremely hard water affecting all home systems. Scale forms within days on heated surfaces, dishwashers produce heavily scaled glassware without treatment, and the near-1,100 TDS produces a pronounced mineral taste in unfiltered drinking water. A whole-house water softener is a household necessity in this high-desert community. An under-sink reverse osmosis unit is the standard solution for producing palatable drinking water. The favorable PFAS level of 3.6 ppt is a positive note — Gallup's remote plateau location, far from major industrial PFAS sources, keeps PFAS contamination well below the levels seen in military-adjacent or urban industrial communities.
Geology & Source: Gallup in McKinley County draws from the Fort Defiance Regional Water System or local groundwater — the San Juan Basin aquifer contacts Cretaceous Gallup Sandstone, Mancos Shale, and Permian carbonate and evaporite formations of the Colorado Plateau — intense carbonate and evaporite dissolution in the arid plateau produces very hard water at 356 mg/L with extreme TDS of 1,071 mg/L.