How does Mount Juliet's water compare to the national average?

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

Mount Juliet Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

8.3

neutral = 7.0

Lead

0.007 mg/L

✓ Below action level

TDS

494.2 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 Mount Juliet, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Mount Juliet	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 Mount Juliet compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Mount Juliet, Tennessee	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Hermitage, Tennessee	≈ 120–179 mg/L	3.9 ppt	🟠 Hard	reservoir
Hendersonville, Tennessee	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
La Vergne, Tennessee	≈ 180+ mg/L	5.7 ppt	🔴 Very Hard	reservoir
Gallatin, Tennessee	140 mg/L	0 ppt	🟠 Hard	reservoir

National Benchmark

How Mount Juliet compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Mount Juliet	≈ 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 Mount Juliet's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 494.2 mg/LpH: 8.3

Mount Juliet, Tennessee, receives its drinking water from the Cumberland River, supplied by the West Wilson Utility District. The water is treated at the K.R. Harrington and Omohundro water filtration plants, which serve the city in Davidson and Wilson Counties. This utility provides service to the Mt. Juliet area and surrounding communities in the greater Nashville region, ensuring treated river water meets all distribution standards before reaching residents.

The Cumberland River watershed spans central Tennessee's karst landscape, underlain by Ordovician and Silurian limestone and dolomite bedrock — including the Cynthiana and Lebanon formations. These carbonate rocks dissolve readily into the river as it flows through terrain with sinkholes and underground drainage, contributing elevated calcium and magnesium. No primary groundwater aquifer is involved; the surface hydrology of this carbonate-rich terrain consistently yields moderately hard to hard water through geological leaching.

Hard water promotes scale buildup in water heaters, dishwashers, and washing machines, where mineral deposits reduce efficiency and shorten lifespan. Regular vinegar descaling helps manage deposits on fixtures and faucet heads. A water softener is recommended for households to prevent limescale and improve soap efficiency. Recent water quality reports indicate three contaminants exceed EPA health guidelines though within legal limits; PFAS presence is noted in some analyses, and filtration is advised for vulnerable groups. Treatment involves conventional filtration, disinfection, and likely lime softening at the plants.

Geology & Source: Cumberland River watershed; Ordovician-Silurian limestone and dolomite karst — Cynthiana and Lebanon formations; carbonate dissolution through sinkholes and underground drainage yields hard, mineral-rich river supply

Other Tennessee Water Reports

Hermitage

≈ 120–179 mg/L

🟠 Hard

Hendersonville

≈ 120–179 mg/L

🟠 Hard

La Vergne

≈ 180+ mg/L

🔴 Very Hard

Gallatin

140 mg/L

🟠 Hard

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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 Mount Juliet's water safe to drink?

Yes. Mount Juliet'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 Mount Juliet?

At ≈ 120–179 mg/L (Hard), Mount Juliet'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 Mount Juliet compare to the USA average?

The USA national average is 151 mg/L. Mount Juliet (≈ 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 Mount Juliet 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.