Smyrna Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
8.2
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
442.5 mg/L
Est. Daily Cost
$0.40
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 Smyrna, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Smyrna | 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 Smyrna compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Smyrna, Tennessee | ≈ 120–179 mg/L | 151.2 ppt | 🟠 Hard | reservoir |
| La Vergne, Tennessee | ≈ 180+ mg/L | 5.7 ppt | 🔴 Very Hard | reservoir |
| Murfreesboro, Tennessee | ≈ 60–120 mg/L | 21.4 ppt | 🟡 Moderately Hard | reservoir |
| Mount Juliet, Tennessee | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | reservoir |
| Hermitage, Tennessee | ≈ 120–179 mg/L | 3.9 ppt | 🟠 Hard | reservoir |
National Benchmark
How Smyrna compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Smyrna | ≈ 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 Smyrna's Water Unique?
Local geology and source profile
The Smyrna Water System, operated by the City of Smyrna in Rutherford County, Tennessee, serves Smyrna and surrounding areas near Nashville. It draws all supply from surface water in Percy Priest Lake on the Stones River. No named treatment plant facilities are specified in available data, but the system employs filtration and softening processes, with hypochlorite used as the disinfectant. The utility can be reached at 615-355-5711 or 315 South Lowry St, Smyrna, TN 37167 for service details.
The Stones River watershed spans the Nashville Basin, transitioning to karst terrain in the Central Basin. Underlying Ordovician-age limestones and dolomites, including the Lebanon Limestone and Catheys Formation, create a conduit-flow system that dissolves substantial calcium and magnesium into surface waters feeding Percy Priest Lake. Rainwater percolates through fractured carbonates, picking up mineral ions before reaching the reservoir, imparting a distinctly hard character to the supply. No groundwater aquifer is involved, keeping the profile surface-derived with geology-driven hardness.
Hard water in Smyrna leads to scale buildup in pipes, heaters, and fixtures, reducing efficiency in water heaters, dishwashers, and washing machines while increasing energy costs by up to 20–30%. Laundry feels stiffer and soap lathers poorly, often requiring more detergent. A whole-house softener is recommended, paired with regular descaling of appliances and low-flow fixtures. Nitrate exceeds health thresholds per independent tests, linked to agricultural runoff; the system complies with lead/copper rules via corrosion control and uses hypochlorite disinfection post-filtration and softening.
Geology & Source: Stones River watershed — Central Basin physiographic province; Ordovician Lebanon Limestone and Catheys Formation dolomite; karstic carbonates dissolve calcium and magnesium — hard water character
Other Tennessee Water Reports
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Frequently Asked Questions
Is Smyrna's water safe to drink?
Do I need a water softener in Smyrna?
How does Smyrna compare to the USA average?
Data Sources & Methodology
Water quality data for Smyrna 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.