How does Fort Knox's water compare to the national average?

The USA national average is 151 mg/L. Fort Knox (≈ 120–179 mg/L) is 1 mg/L softer than average.

Fort Knox Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

river

pH Level

7.8

neutral = 7.0

Lead

0.007 mg/L

✓ Below action level

TDS

522.4 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · 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 Fort Knox, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Fort Knox	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How Fort Knox compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Fort Knox, Kentucky	≈ 120–179 mg/L	6.5 ppt	🟠 Hard	river
Radcliff, Kentucky	≈ 180+ mg/L	0 ppt	🔴 Very Hard	river
Elizabethtown, Kentucky	≈ 120–179 mg/L	50.6 ppt	🟠 Hard	river
Valley Station, Kentucky	135 mg/L	4.5 ppt	🟠 Hard	river
Shepherdsville, Kentucky	≈ 120–179 mg/L	7 ppt	🟠 Hard	river

National Benchmark

How Fort Knox compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Fort Knox	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Fort Knox's Water Unique?

Local geology and source profile

Source: RiverTDS: 522.4 mg/LpH: 7.8

Fort Knox residents receive their drinking water from Hardin County Water District #1/Ft. Knox Water Company. This utility serves around 24,357 people in Hardin County, primarily using the Muldraugh Water Treatment Plant. Currently, much of the water is supplied off-post by Hardin County Water District #1 while the main plant is being renovated. The Fort Knox water supply begins with karst-influenced surface waters, including the Ohio River system, flowing through limestone and carbonate bedrock.

This water travels through Kentucky's characteristic karst geology, where soluble limestone formations readily dissolve, infusing the supply with significant amounts of calcium and magnesium. These karst aquifers and surface sources naturally contribute to a hard water profile. The passage through these mineral-rich geological features is why the water is known for its high mineral content, a common trait in this region's carbonate bedrock.

Homeowners will likely notice scale buildup forming inside appliances like kettles and water heaters, and reduced lathering from soaps and detergents. To combat this, a whole-house water softener is often recommended to protect appliances and improve cleaning efficiency. While the utility's treatment process effectively lowers hardness by about 63%, some hardness remains. Ongoing monitoring by the Army Environmental Command tracks potential contaminants like NDMA and Bromodichloroacetic acid, with historical testing showing no detectable PFAS.

Geology & Source: Ohio River watershed; karst limestone dissolution produces high hardness

Other Kentucky Water Reports

Radcliff

≈ 180+ mg/L

🔴 Very Hard

Elizabethtown

≈ 120–179 mg/L

🟠 Hard

Valley Station

135 mg/L

🟠 Hard

Shepherdsville

≈ 120–179 mg/L

🟠 Hard

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Fort Knox's water safe to drink?

Yes. Fort Knox's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Fort Knox?

At ≈ 120–179 mg/L (Hard), Fort Knox'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 20%.

How does Fort Knox compare to the USA average?

The USA national average is 151 mg/L. Fort Knox (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Fort Knox 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.