Saint Peter Water Hardness & Quality Report (2026)
Water Hardness
12.4 grains per gallon
Source
river
pH Level
8.3
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
481.9 mg/L
Est. Daily Cost
$0.57
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 Saint Peter, your appliances are currently losing 28% efficiency due to mineral buildup.
| Appliance | In Saint Peter | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.6 yrs | 8.5 yrs | -69% |
| Washing Machine | 5.7 yrs | 12 yrs | -53% |
| Water Heater | 7.1 yrs | 15 yrs | -53% |
Regional Water Comparison
How Saint Peter compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Saint Peter, Minnesota | 212.5 mg/L | 6 ppt | 🔴 Very Hard | river |
| North Mankato, Minnesota | 144 mg/L | 4.5 ppt | 🟠 Hard | river |
| Mankato, Minnesota | 99.5 mg/L | 3.4 ppt | 🟡 Moderately Hard | river |
| New Ulm, Minnesota | 113.5 mg/L | 3.8 ppt | 🟡 Moderately Hard | river |
| Waconia, Minnesota | 77.5 mg/L | 2.9 ppt | 🟡 Moderately Hard | river |
National Benchmark
How Saint Peter compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Saint Peter | 212.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Saint Peter home
Shop water softeners on Amazon.com →
What Makes Saint Peter's Water Unique?
Local geology and source profile
Saint Peter, Minnesota, in Nicollet County — the Nicollet County seat adjacent to Madison Lake and Le Sueur on the Minnesota River in south-central Minnesota — receives its water from the City of Saint Peter Water Department, drawing from the Minnesota River through the south-central Minnesota distribution.
The very hard 212.5 mg/L hardness and TDS of 481.9 mg/L reflect the Nicollet County Minnesota River supply's very hard calcareous character — the Cretaceous Niobrara Formation is a highly calcareous chalk and limestone formation, while the Ordovician Prairie du Chien Dolomite contributes additional dolomitic mineral content from the south-central Minnesota River valley bedrock (compare Madison Lake MN: 208/471 in Blue Earth County comparable; Le Sueur MN: 215/493 in Le Sueur County comparable; Saint Peter consistent very hard from the same Nicollet County Minnesota River Cretaceous-Ordovician calcareous supply). The Minnesota River watershed — Cretaceous Niobrara Formation (calcareous — primary hardness contributor), Ordovician Prairie du Chien Dolomite (calcareous — secondary contributor), and Quaternary Minnesota River alluvium (calcareous — TDS contributor).
At 212.5 mg/L with TDS 482, Saint Peter's water is very hard — a water softener is strongly recommended to protect plumbing and appliances. The PFAS level of 6.0 ppt warrants a certified drinking water filter. Review the City of Saint Peter's annual water quality report.
Geology & Source: Saint Peter in Nicollet County draws from the Saint Peter Water on the Minnesota River (Nicollet County, south-central Minnesota) — the Minnesota River at Nicollet County drains Cretaceous Niobrara Formation (calcareous) and Ordovician Prairie du Chien Dolomite (calcareous) — Minnesota Nicollet County Minnesota River Cretaceous-Ordovician calcareous supply produces very hard water at 212.5 mg/L with TDS 481.9 mg/L.