Mendota Heights Water Hardness & Quality Report (2026)
Water Hardness
10 grains per gallon
Source
river
pH Level
8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
348.4 mg/L
Est. Daily Cost
$0.46
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 Mendota Heights, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Mendota Heights | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4 yrs | 8.5 yrs | -53% |
| Washing Machine | 7.3 yrs | 12 yrs | -39% |
| Water Heater | 8.8 yrs | 15 yrs | -41% |
Regional Water Comparison
How Mendota Heights compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mendota Heights, Minnesota | 171 mg/L | 5.1 ppt | 🟠 Hard | river |
| West Saint Paul, Minnesota | 146.5 mg/L | 4.5 ppt | 🟠 Hard | river |
| Saint Paul, Minnesota | 199.5 mg/L | 5.7 ppt | 🔴 Very Hard | river |
| Eagan, Minnesota | 208 mg/L | 5.9 ppt | 🔴 Very Hard | river |
| Inver Grove Heights, Minnesota | 112 mg/L | 3.7 ppt | 🟡 Moderately Hard | river |
National Benchmark
How Mendota Heights compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mendota Heights | 171 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mendota Heights's Water Unique?
Local geology and source profile
Mendota Heights, Minnesota, in Dakota County — a Dakota County city adjacent to West Saint Paul and Eagan at the confluence of the Minnesota and Mississippi Rivers — receives its water from Saint Paul Regional Water Services, drawing from the Mississippi River through the east-central Minnesota distribution.
The hard 171 mg/L hardness and TDS of 348.4 mg/L reflect the Dakota County Mississippi River supply's hard dolomitic character — the Ordovician Prairie du Chien Dolomite and Cambrian Jordan Sandstone are calcareous formations in the Twin Cities Basin, and the Mississippi River acquires substantial dissolved mineral content from its extensive dolomite-limestone drainage (compare West Saint Paul MN: 168/341 in Dakota County comparable; Eagan MN: 173/356 in Dakota County comparable; Mendota Heights consistent hard from the same Dakota County Mississippi River Ordovician dolomitic supply). The Mississippi watershed at Dakota County — Ordovician Prairie du Chien Dolomite (calcareous — primary hardness contributor), Cambrian Jordan Sandstone (slightly calcareous — secondary contributor), and Quaternary Mississippi alluvium (calcareous — TDS contributor).
At 171 mg/L with TDS 348, Mendota Heights' water is hard — scale builds in appliances. Quarterly descaling is appropriate. The PFAS level of 5.1 ppt is moderate — a certified drinking water filter provides added protection. Review Saint Paul Regional Water Services' annual water quality report.
Geology & Source: Mendota Heights in Dakota County draws from the Saint Paul Water on the Mississippi River (Dakota County, east-central Minnesota) — the Mississippi at Dakota County drains Ordovician Prairie du Chien Dolomite (calcareous) and Cambrian Jordan Sandstone (slightly calcareous) — Minnesota Dakota County Mississippi River Ordovician dolomitic supply produces hard water at 171 mg/L with TDS 348.4 mg/L.