How does Eagan's water compare to the national average?

The USA national average is 151 mg/L. Eagan (≈ 180+ mg/L) is 189 mg/L harder than average.

Eagan Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

Source

groundwater

pH Level

8.3

neutral = 7.0

Lead

0.006 mg/L

✓ Below action level

TDS

466.9 mg/L

Est. Daily Cost

$0.91

energy & soap waste

Source: See methodology section below · Updated 2026

very hard180+ mg/LVery Hard · est.

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 Eagan, your appliances are currently losing 45% efficiency due to mineral buildup.

Appliance	In Eagan	Soft Water City	Efficiency Loss
Kettle	4.7 yrs	8.5 yrs	-45%
Washing Machine	6.6 yrs	12 yrs	-45%
Water Heater	8.3 yrs	15 yrs	-45%

Regional Water Comparison

How Eagan compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Eagan, Minnesota	≈ 180+ mg/L	67.4 ppt	🔴 Very Hard	groundwater
Rosemount, Minnesota	291 mg/L	469.7 ppt	🔴 Very Hard	groundwater
Mendota Heights, Minnesota	171 mg/L	5.1 ppt	🟠 Hard	river
Apple Valley, Minnesota	411 mg/L	44.3 ppt	🔴 Very Hard	groundwater
Burnsville, Minnesota	393 mg/L	97 ppt	🔴 Very Hard	river

National Benchmark

How Eagan compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Eagan	≈ 180+ mg/L	🔴 High
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Eagan's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 466.9 mg/LpH: 8.3

The City of Eagan Public Works Department operates the municipal water utility serving Eagan in Dakota County, Minnesota. Water is sourced exclusively from 22 groundwater wells drawing from the Prairie du Chien-Jordan, Mt. Simon, and Jordan aquifers, with wells ranging from 408 to 1,075 feet deep. Treatment occurs at city facilities where iron and manganese are removed via aeration and oxidation, chlorine is added for disinfection, and fluoride is adjusted before distribution to residential, commercial, and industrial customers across approximately 33 square miles.

Eagan's groundwater originates within the regional hydrogeologic framework of east-central Minnesota, influenced by Paleozoic bedrock aquifers. The Prairie du Chien-Jordan aquifer system comprises dolomite and sandstone of Ordovician age, overlain by Cambrian formations including the Jordan Sandstone and Mt. Simon Sandstone. These limestone and dolomite-rich layers dissolve calcium and magnesium as water resides in the aquifer over geological time, imparting a very hard character to the supply. Iron and manganese are naturally abundant due to anoxic conditions in the deep subsurface, necessitating dedicated treatment, while the mineralized profile reflects prolonged rock-water interaction in this karst-influenced geology.

Very hard water causes noticeable scale buildup in water heaters, dishwashers, and washing machines, reducing efficiency and lifespan — water heaters may fail up to 30% sooner without mitigation. Faucets, showerheads, and pipes accumulate deposits restricting flow and causing spotting on glassware and fixtures. Regular vinegar descaling is recommended for appliances; a whole-house water softener is strongly advised to prevent scale, improve soap efficiency, and extend equipment life. The 2022 Consumer Confidence Report confirms compliance with all Minnesota Department of Health drinking water standards and lead and copper rules, with Combined Radium averaging 5.4 pCi/L (MCL 5 pCi/L); iron is maintained at 0.1 ppm, manganese at 0.02 ppm, and fluoride at 0.5–0.9 ppm.

Geology & Source: Prairie du Chien-Jordan, Mt. Simon, and Jordan aquifers — Ordovician-Cambrian limestone, dolomite, and sandstone; carbonate-rich formations dissolve calcium and magnesium during prolonged groundwater residence — characteristically very hard supply

Other Minnesota Water Reports

Rosemount

291 mg/L

🔴 Very Hard

Mendota Heights

171 mg/L

🟠 Hard

Apple Valley

411 mg/L

🔴 Very Hard

Burnsville

393 mg/L

🔴 Very Hard

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Frequently Asked Questions

Is Eagan's water safe to drink?

Yes. Eagan's water meets all federal safety standards. The hardness is ≈ 180+ mg/L (Very Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Eagan?

At ≈ 180+ mg/L (Very Hard), Eagan's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 45%.

How does Eagan compare to the USA average?

The USA national average is 151 mg/L. Eagan (≈ 180+ mg/L) is 189 mg/L above the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Eagan is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

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.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

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.

Measured

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.

Modelled

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.

Calculated

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.