Shelbyville Water Hardness & Quality Report (2026)
Water Hardness
6 grains per gallon
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
165.1 mg/L
Est. Daily Cost
$0.27
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 Shelbyville, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Shelbyville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 10.3 yrs | 12 yrs | -14% |
| Water Heater | 12.9 yrs | 15 yrs | -14% |
Regional Water Comparison
How Shelbyville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Shelbyville, Tennessee | 102 mg/L | 90.7 ppt | 🟡 Moderately Hard | reservoir |
| Tullahoma, Tennessee | ≈ 120–179 mg/L | 152.2 ppt | 🟠 Hard | reservoir |
| Lewisburg, Tennessee | ≈ 0–60 mg/L | 60 ppt | 🟢 Soft | reservoir |
| Murfreesboro, Tennessee | ≈ 60–120 mg/L | 21.4 ppt | 🟡 Moderately Hard | reservoir |
| Manchester, Tennessee | ≈ 120–179 mg/L | 86 ppt | 🟠 Hard | reservoir |
National Benchmark
How Shelbyville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Shelbyville | 102 mg/L | 🟡 Low |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Shelbyville's Water Unique?
Local geology and source profile
Shelbyville Water System, operated under Shelbyville Power & Water, serves Shelbyville and surrounding areas in Bedford County, Tennessee (P.O. Box 530, Shelbyville, TN 37160; 931-684-7171). The primary water source is surface water from the Duck River, with additional supply potentially drawn from Flat Creek as noted in related reports. Water is treated via conventional methods including coagulation, sedimentation, filtration, and chlorination at the local treatment plant, and the utility publishes annual Consumer Confidence Reports for residents detailing compliance with all applicable EPA standards.
The Duck River watershed spans the Central Tennessee Basin, a karst landscape dominated by Mississippian limestones including the Fort Payne Chert and Warsaw Formation, with underlying Ordovician rocks in the Nashville Dome. These soluble carbonate formations contribute to a hard supply through natural dissolution, imparting elevated minerals as river water flows over limestone bedrock and through fractured aquifers. Karst features enhance mineral leaching, shaping the supply's mineralised character without significant buffering from siliceous rocks.
At hard classification, scale buildup affects water heaters, dishwashers, washing machines, and faucets in Shelbyville, reducing efficiency and lifespan. Maintenance tips include regular vinegar descaling, installing sediment filters, and flushing hot water tanks biannually. A water softener is recommended to mitigate spotting on glassware, soap scum, and appliance wear. The 2022 and 2025 Shelbyville Water Quality Reports confirm compliance with turbidity, organic carbon reduction, and Cryptosporidium monitoring; treatment uses chlorine disinfection, and while 2 contaminants are noted above health guidelines and 8 concerns identified — including arsenic, chromium-6, and TTHMs — all remain within EPA MCLs.
Geology & Source: Duck River — Central Tennessee Basin karst; Mississippian Fort Payne Formation and Warsaw Formation limestones and dolomites; Nashville Dome carbonate dissolution yields hard surface water
Other Tennessee Water Reports
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Frequently Asked Questions
Is Shelbyville's water safe to drink?
Do I need a water softener in Shelbyville?
How does Shelbyville compare to the USA average?
Data Sources & Methodology
Water quality data for Shelbyville 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.