Bemidji Water Hardness & Quality Report (2026)
Water Hardness
15.7 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
697.5 mg/L
Est. Daily Cost
$0.72
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 Bemidji, your appliances are currently losing 36% efficiency due to mineral buildup.
| Appliance | In Bemidji | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.6 yrs | 12 yrs | -70% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Bemidji compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Bemidji, Minnesota | 269.5 mg/L | 7.3 ppt | 🔴 Very Hard | river |
| Brainerd, Minnesota | 162.5 mg/L | 4.9 ppt | 🟠 Hard | river |
| Fergus Falls, Minnesota | 126 mg/L | 4 ppt | 🟠 Hard | river |
| Hibbing, Minnesota | 210 mg/L | 6 ppt | 🔴 Very Hard | river |
| Sartell, Minnesota | 252.5 mg/L | 6.9 ppt | 🔴 Very Hard | river |
National Benchmark
How Bemidji compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Bemidji | 269.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Bemidji's Water Unique?
Local geology and source profile
Bemidji, Minnesota, in Beltrami County — the Beltrami County seat on Lake Bemidji adjacent to the Mississippi River headwaters in north-central Minnesota — receives its municipal water from the Bemidji Water Division, drawing from Lake Bemidji (Beltrami County) through the north-central Minnesota water treatment system.
The extremely hard 269.5 mg/L hardness and high TDS of 697.5 mg/L are surprisingly hard for a north Minnesota Laurentian Shield lake — reflecting deep local calcareous glacial till input and carbonate bedrock at the bedrock transition zone of north-central Minnesota. The Lake Bemidji watershed at Beltrami County drains the Laurentian Shield transition zone — Precambrian granite (insoluble, underlying) overlain by Devonian calcareous Prairie du Chien and Ordovician St. Peter Sandstone glacial till-derived carbonate contribution, and Pleistocene calcareous glacial drift (calcareous — primary hardness contributor, derived from Lake Superior calcareous basin sediments transported by Laurentide glaciation).
At 269.5 mg/L with TDS 698, Bemidji's water is extremely hard. A water softener is strongly recommended, and a reverse osmosis system is beneficial for drinking water. Scale builds very rapidly on all surfaces and appliance lifespans are significantly shortened without treatment. The PFAS level of 7.3 ppt warrants a certified reverse osmosis drinking water filter — Bemidji Regional Airport (Beltrami County — AFFF) and the north-central Minnesota industrial corridor contribute to Bemidji's readings.
Geology & Source: Bemidji in Beltrami County draws from the Bemidji Water Division on Lake Bemidji (Beltrami County, north-central Minnesota) — Lake Bemidji on the Mississippi River headwaters drains the Laurentian Shield (Precambrian granites — insoluble) through calcareous Devonian and Ordovician formations — Minnesota Beltrami County Lake Bemidji Mississippi headwaters Devonian calcareous watershed produces extremely hard water at 269.5 mg/L with TDS 697.5 mg/L.