South Saint Paul Water Hardness & Quality Report (2026)
Water Hardness
17.9 grains per gallon
Source
river
pH Level
8.3
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
463.3 mg/L
Est. Daily Cost
$0.82
energy & soap waste
Source: See methodology section below · 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 South Saint Paul, your appliances are currently losing 41% efficiency due to mineral buildup.
| Appliance | In South Saint Paul | 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 South Saint Paul compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ South Saint Paul, Minnesota | 307 mg/L | 5.9 ppt | 🔴 Very Hard | river |
| Inver Grove Heights, Minnesota | 370 mg/L | 154.5 ppt | 🔴 Very Hard | groundwater |
| West Saint Paul, Minnesota | ≈ 180+ mg/L | 4.5 ppt | 🔴 Very Hard | river |
| Maplewood, Minnesota | ≈ 120–179 mg/L | 3.8 ppt | 🟠 Hard | groundwater |
| Saint Paul, Minnesota | ≈ 60–120 mg/L | 10 ppt | 🟡 Moderately Hard | river |
National Benchmark
How South Saint Paul compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ South Saint Paul | 307 mg/L | 🔴 High |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes South Saint Paul's Water Unique?
Local geology and source profile
South Saint Paul, Minnesota is served by the City of South Saint Paul Public Works Department, which operates water treatment and distribution infrastructure for residents and businesses in Dakota County. The utility sources water from both the Mississippi River and groundwater aquifers, treating it at municipal facilities before distribution. The supply draws from the Mississippi River watershed and underlying Ordovician and Cambrian aquifer systems typical of the Twin Cities metropolitan area.
The bedrock geology consists primarily of dolomite and limestone formations, which are highly soluble and contribute significant dissolved minerals — chiefly calcium and magnesium carbonates — to the water. Glacial deposits overlying this carbonate-rich bedrock further elevate mineral content during groundwater recharge. This combination is responsible for the very hard water character of the South Saint Paul supply.
At this hardness level, residents and businesses experience noticeable scale buildup on fixtures and in pipes, reduced soap and detergent effectiveness, and increased maintenance demands on water heaters and appliances. Dishwashers, washing machines, and hot water systems are particularly affected. A whole-house water softener is strongly recommended to reduce scale accumulation, extend appliance lifespan, and improve overall water quality for household use. Regular descaling of fixtures and appliances will help manage mineral buildup in the interim.
Geology & Source: Twin Cities region overlies Ordovician and Cambrian sandstones and carbonates; dolomite and limestone formations plus glacial deposits elevate dissolved calcium and magnesium — producing very hard water
Other Minnesota Water Reports
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Frequently Asked Questions
Is South Saint Paul's water safe to drink?
Do I need a water softener in South Saint Paul?
How does South Saint Paul compare to the USA average?
Data Sources & Methodology
Water quality data for South Saint Paul is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.